1st, a breakdown of how weather systems impact southeastern New England (eastern MA, southern NH, and RI), and 2nd, a detailed forecast, period by period (nights & days) for the next several days.
Tonight & early Saturday… Moisture moving in on a southerly wind will bring plenty of clouds and maybe a few areas of drizzle.
Saturday midday & afternoon… A slice of early summer-feeling weather with lots of sun and warm air.
Saturday night… Clouds return from the west and a weakening area of showers moves through from a cold front that barely makes it across the region before stopping just offshore.
Sunday… The front sitting just offshore will hold clouds in with some occasional light rain or drizzle possible, but no significant rain is expected during the day.
Sunday night & Monday… Developing and deepening low pressure to the south, moving up along the front, takes a left turn into the NY/NJ area, sending a slug of heavy rain toward the area. My concern is that the axis of heaviest precipitation may remain west of much of the forecast area, at least eastern sections. A split may even occur where heavier rain goes both east and west of the Boston area. Therefore, I am going to remain conservative on my rainfall forecast at this point. A good round number guess for rain amounts will be 1/2 to 1 inch for eastern areas and 1 to 2 inches with locally heavier toward the west, with the bigger amounts of 2+ inches being further to the west (Worcester Hills westward). This is still uncertain so please check back for updates. A dry slot working into the storm as it spins over NY State later Monday should shut off any significant rain in the eastern portion of southern New England.
Tuesday & Wednesday… Low pressure lingering over the Northeast will produce scattered showers as the air is unstable.
Thursday & Friday… Uncertain, low pressure trough may keep it somewhat unsettled.
TONIGHT: Clouds increasing southwest to northeast. Low 53-58. Wind S 10-20 MPH.
SATURDAY: Mostly cloudy with patchy drizzle through mid morning, then turning sunny midday well into afternoon before more clouds approach from the W late afternoon hours. High 74-79. Wind SW 10-20 MPH with higher gusts.
SATURDAY NIGHT: Clouding up. Scattered showers moving in west to east by late night. Temperature cooling through the 60s. Wind SW 5-15 MPH shifting to N.
SUNDAY: Cloudy. Chance of light rain and drizzle. Temperature cooling through the 50s. Wind N 5-15 MPH.
MONDAY: AM rain & wind / PM few showers. Low 44. High 54.
TUESDAY: Partly sunny. Slight risk of showers. Low 43. High 56.
WEDNESDAY: Partly cloudy. Slight risk of showers. Low 44. High 57.
THURSDAY: Variably cloudy. Chance of showers. Low 46. High 59.
FRIDAY: Mostly cloudy. Chance of showers. Low 42. High 61.