The next 2 days we will be under the influence of a very weak high pressure area but still in between a frontal boundary and another trough of low pressure to the west. The energy from the west will be enough to set off a round or 2 of pop up showers and possible thunderstorms each of the next 2 afternoons (today and Friday). Most areas will not see anything as coverage will be isolated to scattered, but anywhere that does see something could experience a downpour. The greatest threat for these pop ups will be along and northwest of a line from Providence RI to Boston MA.
By Saturday, the offshore frontal boundary will back up toward the coast, likely increasing the cloudiness over the region. The wildcard is how much rain gets involved, and there will be the chance of areas of rain, but at this stage my guess is that the greatest chance for this rain will be over Cape Cod and southeastern MA and less so elsewhere. Sunday, the boundary, though weak, will likely push further northwestward into the region, and it should be a muggy day with lots of clouds, some sun, and occasional showers and thunderstorms. This may linger into Monday as the front washes out over eastern New England. By Tuesday into midweek, weak high pressure should return and bring fair weather.
Forecast for southeastern New England…
TODAY: Partly cloudy. Isolated to scattered showers and thunderstorms in the afternoon, especially inland areas. Highs 74-82, coolest South Coast. Wind SW 10-20 MPH.
TONIGHT: Partly cloudy. Patchy fog. Lows in the 60s. Wind SSW 5-15 MPH.
FRIDAY: Partly sunny. Isolated to scattered showers and thunderstorms in the afternoon, again mainly inland. Highs 75-83, coolest South Coast. Wind S 5-15 MPH.
SATURDAY: Mostly cloudy. Chance of rain at times, especially southeastern MA. Low 64. High 78.
SUNDAY: Variably cloudy. Episodes of showers/thunderstorms. Low 68. High 82.
MONDAY: Partly sunny. Scattered showers/thunderstorms. Low 68. High 84.
TUESDAY: Partly cloudy. Low 64. High 81.
WEDNESDAY: Mostly sunny. Low 64. High 82.