DAYS 1-5 (JULY 1-5)
July starts off with a comfortable, slightly cooler than normal day, but it won’t be a “fair” day in its entirety, for we have an upper level low pressure area crossing the region with a cold pool of air aloft. As I write this update at 8:00 a.m. I already see diurnal cloud development outside my window here in Boston’s northwest suburbs. They are rather high-based, but regardless will continue to build with the sun’s help, and we will see isolated to scattered showers and potential thunderstorms by midday which will be around until about sunset before completely dissipating. While many areas will be missed by any rainfall, areas that do see a shower or storm can see briefly heavy rainfall. The later in the day we get (once the sun drops below 45 degrees elevation angle), the opportunity for seeing a rainbow will increase if you are in the right place between the sun and a shower. So rainbow seekers, take note! We clear out tonight as the upper low moves out and a clear sky and fairly light wind will make for a pretty cool early July night. High pressure builds in with great weather Tuesday, light wind, light sea breezes at the coast, mild to warm air after the chilly start, and low humidity. High pressure slips offshore Wednesday, another nice day with manageable humidity, but up a few notches from Tuesday with a southerly air flow developing. A weak cold front will cross the region in the early hours of Thursday with some clouds and no more than a brief light shower, but the balance of the Independence Day holiday will feature a sun/cloud mix, warm air, and moderate humidity as what’s left of the frontal boundary dissipates. If there are any other showers that day it would be a couple that generate along the dissipating boundary and/or a sea breeze boundary near the South Coast. By Friday, a trough moves into the Great Lakes while a fairly flat high pressure ridge sits to our south. We’ll see some episodes of cloudiness that day and perhaps a few showers around, though wet weather looks like the major exception rather than the rule. We will be on the warm side and a bit humid to end the week as well.
TODAY: Sun/cloud mix. Isolated to scattered showers and possible thunderstorms midday on. Highs 73-80. Dew point around 60. Wind N 5-15 MPH, few higher gusts.
TONIGHT: Clearing. Ground fog patches forming. Lows 55-62. Dew point under 60. Wind N under 10 MPH.
TUESDAY: Mostly sunny. Highs 78-85, coolest coast. Dew point middle to upper 50s. Wind variable up to 10 MPH with coastal sea breezes.
TUESDAY NIGHT: Partly cloudy. Lows 60-67. Dew point upper 50s. Wind SW up to 10 MPH.
WEDNESDAY: Partly cloudy. Highs 81-88, coolest South Coast. Dew point near 60. Wind SW 5-15 MPH.
WEDNESDAY NIGHT: Variably cloudy. A shower possible overnight. Lows 62-69. Dew point 60+. Wind SW 5-15 MPH.
THURSDAY (INDEPENDENCE DAY): Partly sunny. A pop up shower possible near the South Coast. Highs 82-89. Dew point 60+. Wind W 5-15 MPH.
THURSDAY NIGHT: Partly cloudy. Lows 63-70. Dew point 60+. Wind SW up to 10 MPH.
FRIDAY: Partly sunny. A late-day shower possible. Highs 81-88. Dew point 60+. Wind SW 5-15 MPH.
DAYS 6-10 (JULY 6-10)
The extended holiday weekend through July 7 features warm and humid weather with a daily chance of a shower or thunderstorm, but mostly rain-free weather. High pressure brings fair weather early to middle portions of next week.
DAYS 11-15 (JULY 11-15)
West to northwest flow at upper levels. A few disturbances pass by with shower / t-storm chances, but otherwise mostly dry weather, with some variation in temperature, averaging near to a little above normal for the period.