forecast September 20, 2021 5:13 am Forecast: Sunshine, Highs in the 70s Monday Today: Brilliant sun, fall air. Highs around 70. Tonight: Cool, clear, quiet. Lows either side of 50. Tuesday: Quiet air, variable clouds. Highs around 70. US & World Videos 3:19 Partly cloudy, high temps reach near 70 2:44 It's a cloudy but warm day in Boston 2:53 Monday starts off cloudy with lingering rain 3:45 Forecast: Showers, areas of fog 3:45 Afternoon rains expected on Sunday