forecast August 20, 2020 4:27 pm Mostly Clear and Cool Thursday Evening Overnight Thursday: Mostly clear, cool. Lows around 60. Friday: Sun and clouds, very warm, not too humid. Highs 85 to 90. US & World Videos 3:20 Weather forecast: Highs in the 50s 3:11 The weather's great, but the wheels come off the forecast by the weekend 3:14 Weather forecast: Highs near 70 degrees 0:35 Boston will have plenty of sun, warm air Thursday 2:44 Weather forecast: It'll feel like summer in our region