forecast December 21, 2020 6:56 am Forecast: First Day of Winter Monday Today: Cloudy, Cape showers depart. Highs mostly shy of 40. Overnight Monday Night: Isolated CT freezing rain showers, otherwise cloudy. Lows in the 20s. Tuesday: AM clouds to PM sun. Highs around 40. US & World Videos 2:32 Cool air, scattered rain in store for Boston 2:55 Much cooler temps Tuesday, with scattered rain 2:44 Weather forecast: Scattered morning rain 3:21 Weather forecast: Partly cloudy, with calm conditions 2:27 Warm and humid Monday in Boston