DAYS 1-5 (JUNE 23-27)
A strong high pressure ridge brings the heat to our region today and Tuesday, though the coast is quite vulnerable to a sea breeze today and will end up cooler than inland areas. One thing we’ll need to watch for are some coastal areas to experience a late-day temperature jump if then sea breeze collapses. Tuesday, if there are any sea breezes, they will be feeble and right at the beaches / shore roads, although some areas of Cape Cod will have a direct ocean breeze due to the prevailing wind, so that area will be cooler by default. There is also some thin high altitude wildfire smoke about, and that will give the sky a hazy look during the next couple of days. Wednesday, a back-door cold front will ease its way across the region from northeast to southwest, and a few 90+ high temps are still possible over inland areas, especially southwest of Boston. It is also this region that stands the greatest chance of a pop up shower or thunderstorm associated with the advancing frontal boundary. Thursday and Friday, our weather will be quite different, with the front sitting off to our southwest. High pressure in eastern Canada will provide a broad scale northeasterly to easterly air flow with a cooler maritime air mass. Disturbances moving along the frontal boundary to our south will bring a lot of clouds and the threat of occasional showers – so an overall unsettled, cooler set-up.
TODAY: Patchy clouds in the hills of southwestern NH and central MA early, otherwise hazy sunshine. Highs 74-81 Cape Cod, 82-89 other coastal locations (some of these may occur late-day), 90-97 inland. Dew point 65+. Wind variable up to 10 MPH with coastal sea breezes, then SW up to 10 MPH by day’s end.
TONIGHT: Clear / hazy. Lows 68-75. Dew point 65+. Wind SW up to 10 MPH.
TUESDAY: Hazy sunshine. Highs 92-99 except cooler a few immediate coastal areas and especially Cape Cod. Dew point 65+. Wind W 5-15 MPH, may switch at times to a weak sea breeze along the immediate coastline.
TUESDAY NIGHT: Mostly clear. Lows 71-78. Dew point 65+. Wind W up to 10 MPH.
WEDNESDAY: Partly sunny. An isolated shower or thunderstorm inland areas mainly southwest of Boston in the afternoon. Highs 78-85 coast, 86-93 inland, but a cooling trend from northeast to southwest by midday on. Dew point 65+. Wind shifting to NE 5-15 MPH from northeast to southwest.
WEDNESDAY NIGHT: Partly cloudy. Lows 63-70. Dew point 60+. Wind NE up to 10 MPH.
THURSDAY: Variably cloudy. Scattered showers. Highs 72-79, coolest coast. Dew point 60+. Wind NE to E up to 10 MPH.
THURSDAY NIGHT: Mostly cloudy. Patchy fog. Chance of a shower. Lows 61-68. Dew point 60+. Wind E up to 10 MPH.
FRIDAY: Mostly cloudy. Chance of showers. Highs 68-75, coolest coast. Dew point 60+. Wind E up to 10 MPH.
DAYS 6-10 (JUNE 28 – JULY 2)
The maritime air mass pattern weakens during the June 28-29 weekend with a reduction in shower chances and slightly warmer weather returning, but still coolest along the coast. A more seasonably warm pattern for the final day of June and first couple days of July, but one front to watch that can bring a shower and thunderstorm chance – most likely July 1.
DAYS 11-15 (JULY 3-7)
High pressure looks like it will dominate with fair and seasonably warm weather around the Independence Day time period, with higher humidity and unsettled weather returning later in the period.