The National Weather Service across southern New England is monitoring a developing coastal storm that could impact Massachusetts, Rhode Island, and Connecticut late this week into the weekend, though the track and intensity remain uncertain.
According to NWS Boston Forecast Discussion issued Sunday afternoon, the region first turns dry and cooler through midweek as strong high pressure builds over Quebec. Highs are expected mainly in the low to mid 60s, with a prolonged northeasterly flow. The first day of fall on Tuesday is forecast to stay cool and partly sunny.
Forecasters are then watching a coastal low that could form mid to late week off the Mid-Atlantic and move north. NWS Boston said that system could bring stronger winds and rainfall heading into the weekend. Ensemble guidance still disagrees on how close the low will come to New England. One outcome is a storm that stays offshore with limited inland impact. A closer track could bring coastal flooding, beach erosion, gusty winds, and several inches of rain.
The more immediate NWS concern is over the water. A Gale Watch is in effect for portions of the southern ocean waters from Tuesday afternoon through Thursday. Marine forecasts call for strengthening northeast winds and building seas later in the week, with some ensemble guidance showing a 20 to 30 percent chance of storm-force gusts over Nantucket Sound and Cape Cod Bay Friday into Saturday, and higher probabilities farther offshore south of Long Island and Block Island.
What this means for southern New England
- Monday–Wednesday: Cool, fall-like weather. Mostly dry after Sunday night’s rain ends.
- Thursday–Sunday: Increasing uncertainty. Rain and stronger northeast winds become more likely if the coastal low tracks close to shore.
- Coast and Cape/Islands: Highest risk for rough surf, beach erosion, and higher winds.
- Inland areas: Impacts depend heavily on the storm’s track. Nothing is locked in yet.
NWS Boston emphasized that confidence is still limited this far out.
