From the National Weather Service:
Showers become more numerous after sunset. The showers will bring scattered thunderstorms with them. The night will be mild and very humid with temperatures falling to the upper 60s and 70s.
A cold front moves through Southern New England later tonight and early Friday. Clouds and scattered showers will linger into Friday, but should diminish through the day as the cold front moves offshore. The trend will be for mostly clear skies Friday night through Saturday.