DAYS 1-5 (SEPTEMBER 25-29)

The blocking pattern in place stays in place through this forecast period. High pressure at the surface is far enough north that an east to southeast flow off the ocean drives broken marine layer clouds into our region while a trough approaching from the west spreads its high to mid level clouds in. Summation: A generally cloudy day today. Low pressure associated with the approaching upper trough is expected to track just north of the region on Thursday. Its warm front will bring a bout of rain early morning to midday Thursday, and its cold front will likely bring a briefer period of moderate to heavy showers and possible thunderstorms, with a brief break in between. This system will move off to the east southeast Thursday night and early Friday with a clearing trend will take place, and high pressure again builds to the north of the region. With this we see a return of dry weather Friday and over the weekend. Meanwhile, strengthening Tropical Storm Helene, soon to be a hurricane, will track northward through the eastern Gulf of Mexico and its landfall point is most likely on the eastern part of the Florida Panhandle. Big trouble for that region with rain, wind, and coastal storm surge. Thankfully it appears the core of that hurricane will come ashore in a relatively sparsely populated area, lessening the property impact aspect. Often when we see these systems down there, we hear from their remnants eventually. We will, and we won’t. Huh? What does that mean? It means this. Friday night and Saturday the cloud shield will make it into our sky. It remains to be seen how thick it will get in terms of a limiting factor for Saturday sunshine, but I’ll take a look at that as we get closer to it. Blocking high pressure will keep the rainfall from the system far to our south, hence the dry forecast.

TODAY: Mostly cloudy. Highs 62-69. Wind SE up to 10 MPH.

TONIGHT: Cloudy. Rain arrives west to east overnight. Patchy fog forming. Lows 53-60. Wind SE up to 10 MPH.

THURSDAY: Cloudy. Rain likely until mid afternoon, tapering west to east. Patchy fog. Highs 61-68. Wind SE to S 5-15 MPH.

THURSDAY NIGHT: Cloudy. Moderate to heavy showers and possible embedded thunder moving northwest to southeast across the region. Areas of fog. Lows 52-59. Wind S 5-15 MPH shifting to NW.

FRIDAY: Early morning showers exit the South Coast as clouds diminish. Sun and passing clouds mid morning on. Highs 63-70. Wind NW 5-15 MPH.

FRIDAY NIGHT: High clouds increasing south to north. Ground fog patches forming in lower elevations. Lows 46-53. Wind N diminishing to under 10 MPH.

SATURDAY: Filtered / dimmed sun. Highs 62-69. Wind NE 5-15 MPH.

SATURDAY NIGHT: High clouds decrease north to south. Ground fog patches forming in lower elevations. Lows 45-52. Wind NE diminishing to under 10 MPH.

SUNDAY: Filtered to brighter sun. Highs 62-69. Wind NE 5-15 MPH.

DAYS 6-10 (SEPTEMBER 30 – OCTOBER 4)

Blocking high pressure is expected to keep tropical moisture to our south early in the period. Some remnants of that moisture combined with a trough from the west will bring a brief period of unsettled weather in the October 1-2 time window before fair weather returns. Temperatures variable, moderating early in the period, cooling late period.

DAYS 11-15 (OCTOBER 5-9)

A early-period unsettled interlude as the pattern shifts from blocking to quasi-zonal (more west to east flow). No temperature extremes expected.

DAYS 1-5 (SEPTEMBER 24-28)

On goes the blocking, and our broad scale flow of air off the Atlantic continues during the next 2 days. But today there will be more sun than we saw yesterday, and tomorrow more cloudiness will return both from the ocean due to more moisture from the ocean, and from the west due to the approach of a trough. This trough will bring with it a low pressure area that will deliver showery weather later from late Wednesday night until Thursday evening, so the one really unsettled day of this 5-day period is Thursday. The system moves along and high pressure builds in from eastern Canada for dry weather to return later in the week.

TODAY: Sun/cloud mix. Highs 65-72. Wind NE up to 10 MPH.

TONIGHT: Variably cloudy. Fog patches form in lower elevation locations. Lows 48-55. Wind E under 10 MPH.

WEDNESDAY: Mostly cloudy. Highs 63-70. Wind SE up to 10 MPH.

WEDNESDAY NIGHT: Cloudy. Overnight showers. Patchy fog. Lows 54-61. Wind SE up to 10 MPH.

THURSDAY: Mostly cloudy. Occasional showers. Patchy fog. Highs 62-69. Wind SE 5-15 MPH becoming variable.

THURSDAY NIGHT: Showers end, clouds break, and patchy fog develops. Lows 48-55. Wind N 5-15 MPH.

FRIDAY: Partly cloudy. Highs 61-68. Wind N to NE 5-15 MPH.

FRIDAY NIGHT: Partly cloudy. Fog patches. Lows 45-52. Wind NE under 10 MPH.

SATURDAY: Partly cloudy. Highs 60-67. Wind NE 5-15 MPH.

DAYS 6-10 (SEPTEMBER 29 – OCTOBER 3)

Blocking high pressure is expected to keep tropical moisture to our south early in the period. Some remnants of that moisture combined with a trough from the west will bring a brief period of unsettled weather in the October 1-2 time window before fair weather returns. Temperatures variable, moderating early in the period, chill-down late period.

DAYS 11-15 (OCTOBER 4-8)

A mid-period unsettled interlude as the pattern shifts from blocking to quasi-zonal (more west to east flow). Details TBD. No temperature extremes expected.

DAYS 1-5 (SEPTEMBER 23-27)

Our weather pattern continues to be governed by blocking in the northern hemisphere, and while it allowed low pressure northward enough for some wet weather for part of the weekend, high pressure regains control for dry weather the next few days. There will be another give by high pressure starting at midweek as a trough approaches from the west, bringing wet weather Wednesday night and Thursday. Currently, it looks like the next system will be a little more west-to-east progressive underneath the blocking high so that we dry out at the end of the week. A broad scale northeasterly air flow will keep us on the cool side through midweek, with an interruption in that flow and a more variable wind as low pressure passes through, then a return to a cool north to northeast flow late week.

TODAY: Variably cloudy. Highs 61-68. Wind NE 5-15 MPH.

TONIGHT: Variably cloudy. Lows 48-55. Wind N under 10 MPH.

TUESDAY: Partly sunny. Highs 65-72. Wind variable up to 10 MPH.

TUESDAY NIGHT: Partly cloudy. Patchy ground fog. Lows 48-55. Wind variable up to 10 MPH.

WEDNESDAY: Mostly cloudy. Chance of showers late-day, favoring western areas. Highs 63-70. Wind SE up to 10 MPH.

WEDNESDAY NIGHT / THURSDAY: Mostly cloudy. Occasional showers. Patchy fog. Lows 54-61. Highs 62-69. Wind SE 5-15 MPH becoming variable, eventually W.

THURSDAY NIGHT: Showers end, clouds break, and patchy fog develops. Lows 48-55. Wind N 5-15 MPH.

FRIDAY: Partly cloudy. Highs 61-68. Wind N to NE 5-15 MPH.

DAYS 6-10 (SEPTEMBER 28 – OCTOBER 2)

Looking ahead to the September 28-29 weekend, we must note the increasing liklihood of a tropical cyclone in the Gulf of Mexico, making landfall later this week somewhere along the Gulf Coast. Sometimes moisture from such a system will waste no time streaming northward and reaching our area, but the current indications are that blocking high pressure will be strong enough to keep this away and keep our area dry. Will monitor trends for this. Pattern still looks drier now heading out of September into early October but minor front from the west may bring a brief shower interruption.

DAYS 11-15 (OCTOBER 3-7)

Transition from blocking to quasi-zonal may mean a bout of wet weather at some point in this period of time, but the overall pattern still looks fairly dry most of the time. Temperatures variable, but no extremes.

DAYS 1-5 (SEPTEMBER 22-26)

Counting down the final minutes to summer as I write this morning’s update, when I post it there will probably be only a handful of minutes until the autumnal equinox at 8:43 a.m. EDT this morning. So, goodbye summer, and happy autumn! I’d love to say that today’s weather is going to be stellar, but clearly, low pressure put my overly-optimistic forecast for this weekend to shame, first giving us a more widespread rainfall lasting much of the day in much of the region yesterday. Some areas further to the west did miss out on the beneficial rain, and “too much” rain fell on parts of Cape Cod where 4+ inches were recorded. But overall, a beneficial rain event for many of the areas in southeastern New England that had been dry. And even today is not as “nice” as I had said. While most of the region ends up dry, it takes several more hours to rid ourselves of the rain chance in southeastern MA, and the persistent onshore flow with the storm still not that far away will hold a lot of clouds in, limiting the sun that I also forecast too optimistically for today. Additionally, coastal areas will have to deal with splashover and minor flooding at and around times of high tide due to the persistent onshore flow and still somewhat high astronomical tides. So, while we continue in a blocking pattern into the week ahead, it’s a different enough configuration that we now find ourselves on the unsettled side. That said, I do expect rain-free weather Monday and Tuesday as a weak area of high pressure does build in. However, the center of this high being to the north allows a continues broad scale onshore flow, which means it won’t be as sunny as if the high were parked atop our area. So we’ll have clouds to deal with even if no rainfall. Heading into midweek, systems move enough to allow another trough of low pressure to move our way from the Great Lakes, bringing back the rain chance by later Wednesday and most especially Thursday.

TODAY: Lots of clouds, partial sun. Shower chances continue this morning southeastern MA before ending. Highs 60-67. Wind NE 5-15 MPH.

TONIGHT: Considerably cloudy. Lows 50-57. Wind NE 5-15 MPH.

MONDAY: Variably cloudy. Highs 61-68. Wind NE 5-15 MPH.

MONDAY NIGHT: Variably cloudy. Lows 48-55. Wind N under 10 MPH.

TUESDAY: Partly sunny. Highs 65-72. Wind variable up to 10 MPH.

TUESDAY NIGHT: Partly cloudy. Patchy ground fog. Lows 48-55. Wind variable up to 10 MPH.

WEDNESDAY: Mostly cloudy. Chance of showers late-day, favoring western areas. Highs 63-70. Wind SE up to 10 MPH.

WEDNESDAY NIGHT / THURSDAY: Mostly cloudy. Occasional showers. Patchy fog. Lows 54-61. Highs 62-69. Wind SE 5-15 MPH.

DAYS 6-10 (SEPTEMBER 27 – OCTOBER 1)

Low pressure may linger around the region the first day or two of this period with more wet weather, but it’s unclear how quickly it will move out. Better chances for drier weather come mid to late period.

DAYS 11-15 (OCTOBER 2-6)

Somewhat more zonal pattern may get going here, with quicker-passing mostly minor systems bringing brief shower chances. Temperatures variable, but no extremes.

DAYS 1-5 (SEPTEMBER 21-25)

Offshore low pressure spins and sends lots of clouds and some wet weather into the region today, but a drying trend will begin from north to south this afternoon and continue tonight into Sunday, which will be the better of the 2 weekend days. Coastal areas will continue to have some flooding issues around high tides due to persistent northeast winds and astronomically high tides. The autumnal equinox occurs at 8:43 a.m. EDT on Sunday. High pressure builds in with dry weather for the beginning of the week. The next low pressure system approaches and brings a rainfall chance by midweek.

TODAY: Mainly cloudy. Periods of rain / drizzle. Highs 58-65. Wind NE 5-15 MPH, higher gusts, especially near the coast.

TONIGHT: Mostly cloudy. Some drizzle / rain can linger mainly south of Boston. Lows 49-56. Wind NE 5-15 MPH, diminishing.

SUNDAY: Mostly cloudy to partly sunny. Highs 60-67. Wind NE 5-15 MPH.

SUNDAY NIGHT: Partly cloudy. Lows 48-55. Wind NE 5-15 MPH.

MONDAY: Partly cloudy. Highs 61-68. Wind NE 5-15 MPH.

MONDAY NIGHT: Mostly clear. Patchy ground fog. Lows 48-55. Wind N under 10 MPH.

TUESDAY: Mostly sunny. Highs 65-72. Wind variable up to 10 MPH.

TUESDAY NIGHT: Partly cloudy. Patchy ground fog. Lows 48-55. Wind variable up to 10 MPH.

WEDNESDAY: Increasing clouds. Chance of showers or rain late in the day. Highs 65-72. Wind S up to 10 MPH.

DAYS 6-10 (SEPTEMBER 26-30)

Low pressure brings a rain chance early in the period, followed by drier, cooler weather as it departs and high pressure returns to control.

DAYS 11-15 (OCTOBER 1-5)

A trough brings a shot at showers early period, then dry weather again. Temperatures variable, averaging close to or a little above normal.

DAYS 1-5 (SEPTEMBER 20-24)

While blocking goes on, it has allowed low pressure far enough north to impact our region with clouds and some wet weather. Though we’re not in for a deluge, and could certainly use any rain that falls, we’ll see some occasional rain today and lingering into early Saturday before it dries out again from north to south. The highest rainfall amounts will occur over Cape Cod where it will rain longest from this event. A cooler northeasterly air flow will last from this unsettled period right through the dry-out period during the weekend, and it’ll definitely feel more “the season” as we welcome autumn with the occurrence of the equinox at 8:43 a.m. EDT Sunday. High pressure will keep our region dry again early next week.

TODAY / TONIGHT: Cloudy. Periodic rain and drizzle, favoring eastern and southern areas mainly east and southeast of a line from I-95 to I-90 to I-86. Highs 61-68. Lows 51-58. Wind NE 5-15 MPH, higher gusts especially coast.

SATURDAY: Mostly cloudy. Lingering rain eastern and southern areas in the morning then trending drier. Highs 62-69. Wind NE 5-15 MPH, higher gusts.

SATURDAY NIGHT: Variably cloudy. Lows 50-57. Wind NE 5-15 MPH, diminishing.

SUNDAY: Partly sunny. Highs 61-68. Wind NE 5-15 MPH.

SUNDAY NIGHT: Partly cloudy. Lows 48-55. Wind NE 5-15 MPH.

MONDAY: Partly cloudy. Highs 60-67. Wind NE 5-15 MPH.

MONDAY NIGHT: Mostly clear. Patchy ground fog. Lows 48-55. Wind N under 10 MPH.

TUESDAY: Mostly sunny. Highs 65-72. Wind variable up to 10 MPH.

DAYS 6-10 (SEPTEMBER 25-29)

Another trough / low pressure area brings a wet weather chance around September 25-26. Dry weather follows. Temperatures near to slightly above normal.

DAYS 11-15 (SEPTEMBER 30 – OCTOBER 4)

A more zonal pattern evolves. Two frontal passages bring brief shower chances otherwise drier and a slight cooling trend.

DAYS 1-5 (SEPTEMBER 19-23)

On goes the atmospheric blocking, but it has shifted just enough to allow low pressure to the south to get closer to our region, and this will give some unsettled weather to the region over the next few days. While this is a slightly slower evolution than I’d originally forecast, the basic idea is the same. The greatest impact from rainfall will be over southeastern MA and southern RI, with most areas northwest of a general line down I-95 / I-90 / I-86 staying rain-free much of this time. The maximum impact of the low pressure area’s rain shield should occur between tonight and Friday afternoon in general, but there will be impulses of “less” and “more” during the next few days, with a distinctive trend of the system being pushed back to the south by re-strengthening high pressure by early in the weekend. Region-wide dry weather returns during Saturday and continues Sunday as well as Monday. We also see a cooler regime set-up with a broad scale northeasterly air flow in general for much of this period. The autumnal equinox occurs at 8:43 a.m. EDT on Sunday – the beginning of fall – though some trees this year are already ahead of the game, letting their leaves change as a result of some cooler nights earlier this month, and some as a result of an ongoing dry spell. Boston is now sitting at its 4th-longest recorded stretch of days without measurable rain. That streak may come to an end in the next 48 hours, but we will see how much rain makes it in there.

TODAY: Mostly cloudy. Areas of fog this morning. Periodic rain is most likely east and south of a line along I-95 from southeastern NH to I-90 to I-86 (eastern and southeastern areas). Highs 66-73. Wind NE 5-15 MPH, higher gusts South Coast.

TONIGHT through FRIDAY NIGHT: Cloudy. Periodic rain favoring far eastern and southeastern areas (east & southeast of a line from I-95 to I-90 to I-86). Areas of fog at times. Lows 51-58. Highs 62-69. Wind NE 5-15 MPH, higher gusts favoring coastal areas.

SATURDAY: Lots of cloud – partial sun more possible to the north and west. Lingering rain possible near the South Coast and Cape Cod until midday. Highs 62-69. Wind NE 5-15 MPH, higher gusts coastal areas.

SATURDAY NIGHT: Variably cloudy. Lows 50-57. Wind NE 5-15 MPH, diminishing.

SUNDAY: Partly sunny. Highs 61-68. Wind NE 5-15 MPH.

SUNDAY NIGHT: Partly cloudy. Lows 48-55. Wind NE 5-15 MPH.

MONDAY: Partly cloudy. Highs 60-67. Wind NE 5-15 MPH.

DAYS 6-10 (SEPTEMBER 24-28)

Another trough / low pressure area brings a wet weather chance around September 25-26, based on current mid level projections of features. Dry, cooler weather later in the period.

DAYS 11-15 (SEPTEMBER 29 – OCTOBER 3)

Overall pattern looks dry here with some moderation briefly then another shot of cooler weather.

DAYS 1-5 (SEPTEMBER 18-22)

Blocking continues, but shifts a little to allow low pressure to the south to press northward the next few days. This throws a cloud shield into our region, still initially battling dry air but finally to win out over it tonight. The now shorter-term question to answer is the northern extent of the rain shield and the amount of rain that falls. While some shorter range guidance has trended a little wetter, but not consistently run-to-run, I am still reluctant to jump on that bandwagon and go for a more solid rain event, other than perhaps the South Coast region. The radar may look impressive for a while as the shield works its way into the I-90 belt and even a bit north, but this will still be up against a rebuilding dry high pressure area in eastern Canada, and a squeeze-play will be on. The dry air can significantly cut back on how much rain survives / makes it to the ground in the northern portion of the precipitation shield. We see this in winter events too when trying to forecast snowfall amounts in a similar synoptic set-up. So other than prolonging the impact of this low through Thursday, and into part of Friday, my forecast isn’t changing drastically regarding its impact. Another aspect of this situation will be a gusty northeasterly wind combined with astronomically high tides, which will lead to several high tide cycles of splash-over and some minor inundation in prone locations. Be aware of this if you live in or are traveling to coastal areas the next few days. As we get into the weekend, the dry air wins out again, and while we still may see a fair amount of clouds Saturday, the sun will become more dominant with time Saturday through Sunday, and it will be rain-free, but breezy at first, and quite a bit cooler than we’ve been in recent days. Autumn arrives with the equinox at 8:43 a.m. EDT on Sunday.

TODAY: Areas of fog until mid morning. Limited sun – clouds eventually thicken from south to north later. Highs 70-75 coast, 75-80 inland. Wind SE up to 10 MPH.

TONIGHT: Cloudy. Periods of rain South Coast. Areas of fog. Lows 56-63. Wind E up to 10 MPH.

THURSDAY: Cloudy. Periodic rain is most likely from the I-90 belt southward. Highs 66-73. Wind E 5-15 MPH, higher gusts South Coast.

THURSDAY NIGHT: Cloudy. Periodic rain, again greatest chance from the I-90 belt southward. Lows 53-60. Wind NE 5-15 MPH.

FRIDAY: Mostly cloudy. Rain potential continues especially morning and mostly south of I-90. Highs 63-70. Wind NE 5-15 MPH, higher gusts at the coast.

FRIDAY NIGHT: Variably cloudy. Lows 48-55. Wind NE 5-15 MPH.

SATURDAY: Partly sunny. Highs 62-69. Wind NE 5-15 MPH, higher gusts coast.

SATURDAY NIGHT: Partly cloudy. Lows 50-57. Wind NNE 5-15 MPH, diminishing.

SUNDAY: Mostly sunny. Highs 61-68. Wind N 5-15 MPH.

DAYS 6-10 (SEPTEMBER 23-27)

Dry, cool start then moderation. Watch for another push of low pressure from the south and west with a potential rain threat around the middle of next week before drier weather returns.

DAYS 11-15 (SEPTEMBER 28 – OCTOBER 2)

Overall pattern still looks dry with high pressure in control most of the time. A cooler push earlier in the period, then some moderation again.

DAYS 1-5 (SEPTEMBER 17-21)

A quick “K” spike last night, the measure of disturbances in the Earth’s magnetic field, a result of the most recent solar storm, resulting in a relatively short-lived but somewhat decent display of the aurora, or northern lights, mainly during the 11 p.m. hour. Limiting factors in the ability to see this were the bright nearly-full moon, a thin veil of high altitude wildfire smoke, and in southern areas, some high cloudiness. However there were some observations of it and some images captured (I observed the upper reddish portion of the “curtain” faintly before 11:30 p.m. while the greenish lower portion was too close to the horizon and washed out by light pollution in my location – but seen in some areas). While not expected tonight, if a surprise instance did occur, it’d be less likely to be seen with additional high clouds and a full moon shining. In other weather news, our warm spell is on its last legs, but will still be with us today, and still fairly mild to warm for some inland areas tomorrow, so it’s not quite over yet. But we’re going to see a change coming up and the feel of fall coming back before fall arrives. How does that all unfold during these final 5 days of summer? High pressure sits atop us today while to the south low pressure that has brought wind and rain to parts of the Southeast and southern Mid Atlantic spreads its high cloud shield northward. You’ll notice the sun filtered to dimmed at times today by those clouds, as well as some lingering high altitude wildfire smoke, but we’ll still see a fair amount of sun nonetheless. Away from a slightly cooling ocean breeze, many locations will crack 80 for high temps. As low pressure, while weaker, edges closer to our region from the south Wednesday and Thursday, in response to some give in the high pressure area, we’ll have heavier cloud cover, and the evolution of a steadier regional onshore flow, with a cooling trend. The ongoing question: How much rain gets into southern New England from the south? Some will, but just as this push of rain takes place, a reinforced high pressure area in eastern Canada will start pushing things in the other direction, and dry air will be eating away at the northern side of the moisture from the south. As it stands, the South Coast, up to about the I-90 belt, has the best chance of measurable rainfall between Wednesday night and Friday morning, before the system is pushed back to the south. This will return us to dry weather and some clearing, though clouds may hang around much of Friday before we have more of a sun/cloud mix Saturday. One thing’s for sure, it will be noticeably cooler by the end of this week. Additionally, Boston is in the midst of a long spell with no measurable rain. This is the 28th straight day of that, and the 5th longest stretch on record. The 4th longest is 29 days from 1930. Boston should tie that. Will they break it? Since measurable rain is no guarantee there, it’s very possible. I’ll talk about the rest of the list in the comments section and in future updates if the streak continues beyond this midweek rain threat.

TODAY: Sunshine often filtered to dimmed by high clouds and high altitude smoke. Highs 77-84, coolest South Coast. Wind S up to 10 MPH.

TONIGHT: Full Harvest Moon veiled by high clouds and lingering high altitude smoke, then may fade behind thicker clouds later at night. Patchy ground fog forming mainly interior lower elevations – valleys, swamps, bogs. Lows 54-61. Wind calm to SE under 10 MPH.

WEDNESDAY: Mostly cloudy. Potential rain South Coast by late-day. Highs 74-81. Wind SE 5-15 MPH.

WEDNESDAY NIGHT: Mostly cloudy. Potential rain, greatest chance South Coast. Areas of fog. Lows 58-65. Wind E 5-15 MPH.

THURSDAY: Mostly cloudy. Periodic rain is most likely from the I-90 belt southward. Highs 66-73. Wind E 5-15 MPH, higher gusts South Coast.

THURSDAY NIGHT: Clouds linger. Rain chance may hang on South Coast. Lows 51-58. Wind NE 5-15 MPH.

FRIDAY: Clouds dominate / intervals of sun. Highs 63-70. Wind NE 5-15 MPH, higher gusts at the coast.

FRIDAY NIGHT: Partly cloudy. Interior lower elevation fog patches. Lows 45-52. Wind NE 5-15 MPH, diminishing.

SATURDAY: Partly cloudy. Highs 62-69. Wind NE 5-15 MPH.

DAYS 6-10 (SEPTEMBER 22-26)

Dry weather, starting cool then moderating from the end of the weekend into early next week. Will have to watch for another push of low pressure from the south and west toward the middle of the week with a rain threat.

DAYS 11-15 (SEPTEMBER 27 – OCTOBER 1)

Overall pattern still looks dry with high pressure in control most of the time. A cooler push earlier in the period, then some moderation again.

DAYS 1-5 (SEPTEMBER 16-20)

High pressure continues its influence on our weather with fair and warm conditions early this week, but you’ll notice some increasing high cloudiness from the south later today and especially Tuesday. This is fanning off low pressure that is organizing off the US Southeast Coast and moving onshore into the Carolinas. By Wednesday, we lose our high pressure area but because of the blocking still in place in the atmosphere, the low to the south isn’t going to come up the coast that much. It just drifts up in this direction for a while – enough to thicken the clouds and spread some of its rain into at least the South Coast region by late Wednesday. How far north this comes is still in question, but the region overall stands the greatest chance of seeing wet weather from this system Wednesday night and Thursday. By Friday, we’ll already see high pressure from the north regaining control and starting to push this system back out to the south. During mid to late week we’ll have transitioned from our current warmth to a cooler regime…

TODAY: Sun – filtered by the arrival of high clouds from south to north later. Highs 78-85, coolest South Coast. Wind variable to SE up to 10 MPH.

TONIGHT: High cloudiness spreads across the sky. Patchy ground fog interior lower elevations. Lows 51-58. Wind SE to S under 10 MPH.

TUESDAY: Sun – dimmed by the thickening of high clouds south to north. Highs 77-84, coolest South Coast. Wind S up to 10 MPH.

TUESDAY NIGHT: Mostly cloudy. Patchy fog. Lows 54-61. Wind S up to 10 MPH.

WEDNESDAY: Mostly cloudy. Potential rain South Coast by late-day. Highs 74-81. Wind SE 5-15 MPH.

WEDNESDAY NIGHT: Mostly cloudy. Potential rain, greatest chance South Coast. Areas of fog. Lows 58-65. Wind E 5-15 MPH.

THURSDAY: Mostly cloudy. Periodic rain is most likely from the I-90 belt southward. Highs 66-73. Wind E 5-15 MPH, higher gusts South Coast.

THURSDAY NIGHT: Clouds linger. Rain chance may hang on South Coast. Lows 51-58. Wind NE 5-15 MPH.

FRIDAY: Cloud / sun mix. Highs 63-70. Wind NE 5-15 MPH, higher gusts at the coast.

DAYS 6-10 (SEPTEMBER 21-25)

Canadian high pressure is expected to be strong enough to provide dry but cooler weather for the September 21-22 weekend. We welcome autumn with the equinox at 8:43 a.m. on September 22. Pattern looks dry and milder early next week, but another surge of wet weather may make a run at the region from the southward around the middle of next week – something to watch.

DAYS 11-15 (SEPTEMBER 26-30)

Indications are for high pressure domination – mainly fair weather, a cool push then a moderating trend.

DAYS 1-5 (SEPTEMBER 15-19)

The temperature and dew point had an overnight meeting, resulting in fog in many areas. Other areas that didn’t fog in may see a blanket of low clouds to start the day, while sun was already visible at sunrise in some spots. The most extensive cloud and fog area at sunrise resided just inland from the eastern coast and had its western limit about where yesterday’s sea breeze stopped progressing inland. Any fog and low clouds will burn away by mid to late morning, leaving us with a sunny midday and afternoon. The coast will be coolest today as an onshore wind evolves, but overall it will be a mild to warm day. High pressure delivers late summer warmth and fair weather Monday and Tuesday. It is at midweek when we finally see enough give in the high pressure area to allow low pressure, and some of its wet weather, to move up from the south. This will bring some increased wind and an episode or two of rain to parts of the region, favoring southern areas. The best chance time window currently appears to be from Wednesday evening to midday Thursday. I’ll fine-tune this in upcoming blog posts.

TODAY: Areas of fog / low clouds early to mid morning, then mainly sunny. Highs 75-82, coolest coast. Wind variable up to 10 MPH, mostly E to SE.

TONIGHT: Mostly clear. Patchy fog interior lower elevations. Lows 51-58. Wind variable under 10 MPH.

MONDAY: Mostly sunny. Highs 78-85. Wind variable up to 10 MPH.

MONDAY NIGHT: Mostly clear. Patchy fog interior lower elevations. Lows 52-59. Wind variable under 10 MPH.

TUESDAY: Partly cloudy. Highs 78-85. Wind SW up to 10 MPH.

TUESDAY NIGHT: Partly cloudy. Patchy fog. Lows 54-61. Wind S up to 10 MPH.

WEDNESDAY: Variably cloudy. Potential rain South Coast by late-day. Highs 68-75. Wind SE 5-15 MPH.

WEDNESDAY NIGHT: Mostly cloudy. Potential rain, greatest chance South Coast. Areas of fog. Lows 58-65. Wind E 5-15 MPH.

THURSDAY: Mostly cloudy to partly sunny. Chance of rain in the morning, favoring the South Coast. Highs 65-72. Wind NE 10-20 MPH.

DAYS 6-10 (SEPTEMBER 20-24)

Similar pattern continues with some blocking in the atmosphere. High pressure from eastern Canada delivers drier, cooler weather early in the period before sinking to the south and allowing a warm up mid period, then potentially giving with a wet weather chance from the south late period.

DAYS 11-15 (SEPTEMBER 25-29)

Wash / rinse / repeat .. same pattern delivers another cooler push from Canada that then gives way to later-period warm-up.

DAYS 1-5 (SEPTEMBER 14-18)

High pressure is reinforced from Quebec this weekend as a weak front has pushed through the region. This will turn the wind more northeasterly today, but not very strong, so we’ll still see pretty mild to warm air, just a slight cooling trend the next couple days, most notable in coastal areas. This particular high is not tapping a very cool air mass as that has shifted west for the time being. It’s just a continuation of the blocking pattern that’s keeping our region dry and South and Southeast unsettled, including the remains of Francine. The earliest we have a chance of seeing any of that moisture come this far north would be the end of this 5-day forecast period – Wednesday – and even that is not a very significant chance, which is higher toward the South Coast than anywhere else. I’ll monitor that part of the outlook. Otherwise it’s dry weather, and even another warm-up early in the week as we roll through the late days of summer 2024.

TODAY: Mostly sunny. Highs 75-82, coolest coast. Wind N to E up to 10 MPH.

TONIGHT: Mostly clear evening. Areas of low clouds and fog overnight. Lows 51-58. Wind variable under 10 MPH.

SUNDAY: Early fog / low clouds in some areas. Otherwise mostly sunny. Highs 75-82, coolest coast. Wind variable to NE up to 10 MPH.

SUNDAY NIGHT: Mostly clear. Patchy fog interior lower elevations. Lows 51-58. Wind variable under 10 MPH.

MONDAY: Mostly sunny. Highs 78-85. Wind variable up to 10 MPH.

MONDAY NIGHT: Mostly clear. Patchy fog interior lower elevations. Lows 52-59. Wind variable under 10 MPH.

TUESDAY: Mostly sunny. Highs 78-85. Wind SW up to 10 MPH.

TUESDAY NIGHT: Partly cloudy. Patchy fog. Lows 54-61. Wind S up to 10 MPH.

WEDNESDAY: Variably cloudy. Potential showers South Coast. Highs 68-75. Wind SE 5-15 MPH.

DAYS 6-10 (SEPTEMBER 19-23)

The potential for humid weather and showers exists early in the period, but will depend on how much give there is in a high pressure area and as a result how far north moisture can make it. The trend after is dry and cooler from eastern Canadian high pressure. Autumnal equinox is 8:43 a.m. September 22.

DAYS 11-15 (SEPTEMBER 24-28)

There may be a renewed push of moisture and warmer air from the south with some wet weather chances returning at some point during this period. A lot of details to work out in the battle between that and drier air from the north as the ongoing large scale pattern doesn’t change all that much.

DAYS 1-5 (SEPTEMBER 13-17)

Happy Friday the 13th! If you used today as a day to extend your weekend or otherwise have the day off from your usual daily toil, it’s your lucky day! We’re going to see plenty of sun and temperatures that climb enough to give the feel of mid summer for several hours. As a cold front approaches from the north late in the day, some clouds will start to develop, and a couple of them can build enough to produce a spot shower or thunderstorm mainly in southern NH and far northern MA by the end of the day, but this chance is low and any activity would be isolated with the extreme majority of our region seeing none of that. Any that do pop up will fade this evening and the frontal boundary will continue southward through our region with just some clouds. Another thing you’ll notice today is the hazy look to the sky and filtered nature of the sunshine, and this is once again due to a plume of wildfire smoke from both Canada and the western US as fire season goes on. Overnight, some foggy areas can develop as the temperature drops to meet a dew point that did rise a little bit off recent much lower values. You may notice that today, if you’re sensitive to humidity, that the dew point has climbed to around 60. High pressure will continue to be the mainly player in our weather this weekend and early next week as well. While the weekend will be slightly cooler than today will be, especially along the coast with an easterly component to the wind due to the high to the north, we will continue to see temperatures running above normal, and this warmer spell will also continue into the beginning of next week.

TODAY: Some cloudiness around eastern MA and RI during early morning, otherwise sunshine filtered by high and mid level wildfire smoke. Additional clouds pop up later with a slight chance of a shower or thunderstorm across southern NH and far northern MA by late afternoon. Highs 80-87. Dew point heads to near 60. Wind S up to 10 MPH.

TONIGHT: Some clouds early then clearing, but patchy fog forming later. Lows 56-62. Wind W up to 10 MPH.

SATURDAY: Mostly sunny. Highs 75-82, coolest coast. Wind N to E up to 10 MPH.

SATURDAY NIGHT: Mostly clear. Patchy fog interior lower elevations. Lows 51-58. Wind variable under 10 MPH.

SUNDAY: Mostly sunny. Highs 75-82, coolest coast. Wind variable to E up to 10 MPH.

SUNDAY NIGHT: Mostly clear. Patchy fog interior lower elevations. Lows 51-58. Wind variable under 10 MPH.

MONDAY: Mostly sunny. Highs 76-83. Wind variable up to 10 MPH.

MONDAY NIGHT: Mostly clear. Patchy fog interior lower elevations. Lows 52-59. Wind variable under 10 MPH.

TUESDAY: Mostly sunny. Highs 77-84. Wind SW up to 10 MPH.

DAYS 6-10 (SEPTEMBER 18-22)

On the larger scale, we don’t completely lose the blocking pattern we have, but it can adjust enough to allow some of the moisture held to our south to make its way to north, to introduce higher humidity and a shower chance by the middle of next week. Some guidance shows this while other guidance does not, but the possibility is there, so for now it’ll be part of the outlook. Later next week the indications are for another stronger push of high pressure from eastern Canada and dry weather and a slight cool-down. Monitoring the trends and eventually will be able to provide more detail. One thing we know for sure: Autumnal equinox is 8:43 a.m. September 22.

DAYS 11-15 (SEPTEMBER 23-27)

The general trend is for high pressure to be in control most of the time with a dry and fairly mild pattern (though a push of cooler Canadian air is possible for a portion of the period).

DAYS 1-5 (SEPTEMBER 12-16)

A large scale block remains in place with high pressure dominating our weather through the weekend and into the beginning of next week too. The only change to take place is the dominant high regarding our weather will shift from one to our south today and Friday to one in Quebec thereafter. Between the 2 a dry cold frontal passage will take place early Saturday. Temperatures that warm to mid summer levels by tomorrow get knocked back a little bit over the weekend, but we’ll still be in a very mild pattern.

TODAY: Mostly sunny. Highs 78-85. Wind SW 5-15 MPH.

TONIGHT: Clear. Interior lower elevation fog patches. Lows 54-61. Wind SW up to 10 MPH.

FRIDAY: Mostly sunny. Highs 81-88, maybe a little cooler along the South Coast. Wind SW 5-15 MPH.

FRIDAY NIGHT: Mostly clear evening. Partly cloudy overnight. Lows 56-62. Wind W 5-15 MPH.

SATURDAY: Partly cloudy morning. Mostly sunny afternoon. Highs 72-82. Wind NW to NE 5-15 MPH.

SATURDAY NIGHT: Mostly clear. Patchy fog interior lower elevations. Lows 51-58. Wind variable under 10 MPH.

SUNDAY: Mostly sunny. Highs 75-82, coolest coast. Wind variable to NE up to 10 MPH.

SUNDAY NIGHT: Mostly clear. Patchy fog interior lower elevations. Lows 51-58. Wind variable under 10 MPH.

MONDAY: Mostly sunny. Highs 76-83. Wind variable up to 10 MPH.

DAYS 6-10 (SEPTEMBER 17-21)

The large scale pattern will continue to feature some blocking in the atmosphere, with high pressure remaining in control of our weather early to mid next week. Later in the week a more southerly air flow will allow more humidity to arrive and a chance of some shower activity – details TBD. Temperatures near to above normal.

DAYS 11-15 (SEPTEMBER 22-26)

The autumnal equinox occurs at 8:43 a.m. on September 22. A little more interaction of moisture from the south and jet stream / cooler air masses from the north means a better shot at some shower activity at times and somewhat variable temperatures. Far too soon for daily details.

DAYS 1-5 (SEPTEMBER 11-15)

A blocking pattern keeps high pressure in place through late week, with fair weather and a warming trend. A dry cold front passages and a new high pressure area in Quebec will keep the weather fair but a touch cooler for the weekend.

TODAY: Sunny. Highs 75-82. Wind SW 5-15 MPH.

TONIGHT: Clear. Interior lower elevation fog patches. Lows 52-59. Wind SW up to 10 MPH.

THURSDAY: Mostly sunny. Highs 78-85. Wind SW 5-15 MPH.

THURSDAY NIGHT: Clear. Interior lower elevation fog patches. Lows 54-61. Wind SW up to 10 MPH.

FRIDAY: Mostly sunny. Highs 81-88, maybe a little cooler along the South Coast. Wind SW 5-15 MPH.

FRIDAY NIGHT: Mostly clear evening. Partly cloudy overnight. Lows 56-62. Wind W 5-15 MPH.

SATURDAY: Partly cloudy morning. Mostly sunny afternoon. Highs 72-79. Wind NW to NE 5-15 MPH.

SATURDAY NIGHT: Mostly clear. Patchy fog interior lower elevations. Lows 51-58. Wind variable under 10 MPH.

SUNDAY: Mostly sunny. Highs 71-78. Wind variable up to 10 MPH.

DAYS 6-10 (SEPTEMBER 16-20)

The large scale pattern will continue to feature some blocking in the atmosphere, with high pressure remaining in control of our weather early to mid next week. Later in the week a more southerly air flow will allow more humidity to arrive and a chance of some shower activity – details TBD. Temperatures near to above normal.

DAYS 11-15 (SEPTEMBER 21-25)

A little more interaction of moisture from the south and jet stream / cooler air masses from the north means a better shot at some shower activity at times and somewhat variable temperatures. Far too soon for daily details. The autumnal equinox occurs at 8:43 a.m. on September 22.