Boston weather forecast December 12, 2020 7:04 pm Forecast: Messy Monday Kicks Off Week of Wintry Weather Today: Mostly cloudy, rainy afternoon southeastern New England. High in the 40s. Tonight: Fog and drizzle, temperatures hold in the 40s. Tomorrow: Sun and clouds, high in the 50s. US & World Videos 3:02 Weather forecast: Morning showers, with afternoon thunderstorms 2:40 Weather forecast: Several rounds of heavy rain, thunderstorms 2:11 Weather forecast: Rain and showers 3:13 Weather forecast: Clear and sunny, with temps in the 70s 2:31 Another warm day in Boston with plenty of sunshine