DAYS 1-5 (AUGUST 16-20)
Discussion…
The second of two low pressure areas will pass south of New England during the next 24 hours (through early Monday) before moving out to sea. This, combined with high pressure to the north, will keep a cool northeasterly air flow going across the region, and this second low pressure wave will be close enough to cause some rainfall mainly over the South Coast and southeastern MA, though patchy light rain is possible elsewhere, from this evening through early Monday before that chance drops off as the wave moves away. We will also continue to see rough surf especially along east-facing and north-facing shores into Monday, so use caution of being near or in the water there. With the evolution of these low pressure waves as they are, things are moving right along and a cold front I once expected to arrive late Tuesday will now be offshore by midday Tuesday. “Cold front” is only used in a sense, because it will actually be warmer behind that front, as the air mass will be of continental origin, and not modified by our ocean nearby but by sun-heated land that the air mass has been passing over. So once that front goes by, we’ll have a return to more of the feel of summer through midweek, but without the humidity spiking too much. By Thursday, a very weak frontal boundary will be in the region, likely dissipating, and will probably result in more decorative clouds in the late summer sky than anything shower threat, which will be minimal as it looks right now.
Details…
TODAY: Mostly cloudy. A very light shower or brief drizzle possible anywhere through early afternoon. An episode of showers more likely South Coast and especially Cape Cod late-day. Highs 68-75. Dew point temperatures upper 50s to lower 60s. Wind NE to E 5-15 MPH inland, 15-25 MPH coast.
TONIGHT: Cloudy. A period of rain likely Cape Cod & Islands, lesser chance of rain elsewhere. Lows 58-65. Dew point upper 50s to lower 60s. Wind E to NE 5-15 MPH inland, 15-25 MPH coast.
MONDAY: Mostly cloudy. Risk of rain far eastern MA favoring Cape Cod early. Isolated light showers possible anywhere late morning through afternoon. Highs 70-77. Dew point lower to middle 60s. Wind NE to N 10-20 MPH coast and 5-15 MPH inland morning, variable up to 10 MPH midday, S up to 10 MPH mid afternoon on.
MONDAY NIGHT: Variably cloudy. Chance of a shower and slight chance of a thunderstorm overnight. Lows 63-70. Dew point lower to middle 60s. Wind SW 5-15 MPH.
TUESDAY: Partly sunny. Chance of showers and thunderstorms morning. 77-84. Dew point falling lower 60s to middle 50s. Wind W 5-15 MPH.
TUESDAY NIGHT: Mostly clear. Lows 60-67. Dew point 50s. Wind W 5-15 MPH.
WEDNESDAY: Mostly sunny. Highs 80-87. Dew point 50s. Wind W 5-15 MPH.
WEDNESDAY NIGHT: Partly cloudy. Lows 61-68. Dew point upper 50s. Wind SW up to 10 MPH.
THURSDAY: Partly cloudy. Very light chance of a shower. Highs 76-81 South Coast, 82-87 elsewhere. Wind S to variable 5-15 MPH.
DAYS 6-10 (AUGUST 21-25)
High pressure brings dry weather and low to moderate humidity August 21. Higher humidity and showers/thunderstorms possible for the August 22-23 weekend, and a frontal boundary hanging nearby may keep some showers around into August 24 before high pressure builds in and returns fair weather to the region at the end of the period.
DAYS 11-15 (AUGUST 26-30)
High pressure is expected to be in control with generally fair weather and near to above normal temperatures for much of if not all of this period.