Weather August 9, 2020 6:22 pm Forecast: Boston Hits 91, Muggy Night Ahead Tonight: Fair sky, muggy with lows near 70º Tomorrow: Hot and humid, spot shower or storm, highs near 90º. Tuesday: Sunny. Hot. Highs in the mid 90s. US & World Videos 2:18 Weather forecast: Sunny and mild 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