A large are of high pressure stretching from the Great Lakes to the Northeast will keep New England and the Mid-Atlantic states dry for a while. Weather systems will move very slowly in the next week, and that will result in a dry seasonably cool pattern for the Northeast. The center of the high pressure is expected to stay west of Southern New England, keeping the wind out of the north or northwest. There should be plenty of sunshine during the day, with mainly clear skies at night.
Monday night will be clear without much of a breeze. The temperature will drop into the 30s to low 40s in the countryside and low to mid 40s in the cities and near the coast. Tuesday will feature mostly sunny skies with highs in the mid 60s. There will be a fresh northwest breeze thanks to the combination of a storm over the Canadian Maritimes and high pressure over the eastern Great Lakes. The wind will be 10-20 mph in the afternoon.
Wednesday and Thursday look similar, with lows in the 40s to low 50s, and highs in the mid to upper 60s under mostly sunny skies. There will be a light northwesterly breeze that turns onshore in the afternoon.
Fine weather is likely through the last weekend of September. Friday should be delightful, with mostly sunny skies and highs between 65-70°. It will get milder over the weekend. High pressure will drift south of Southern New England, and the wind will swing around to the southwest. Saturday will be in the upper 60s to low 70s, Sunday looks like the low to mid 70s, with upper 60s near the coast. Both days will be partly to mostly sunny. The next chance of rain is not until early next week.