forecast December 21, 2020 5:00 am Forecast: First Day of Winter Begins 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 3:24 Weather forecast: Highs in the 50s 3:43 Look out for showers this afternoon in Boston 3:41 Cool air to linger over Boston into the weekend 3:17 Cooling back down, weekend turns wet in Boston 3:02 Dry and cooler in our region, with temps in the mid-50s