forecast May 22, 2021 6:24 pm Boston Could Hit 90 Sunday for First Time in 2021 Tonight: Partly cloudy. Mild. Lows in the 60s. Sunday: Sun to PM showers/thunder. Highs near 90. Monday: Sunny. Cooler. Highs in the low 70s. US & World Videos 3:28 Forecast: Mostly cloudy, few showers tonight 3:57 Pleasant Sunday despite morning showers 3:36 FORECAST: Rain overnight, clear Sunday 3:45 Forecast: Overnight showers, Sunday hits 70 2:51 Sunny Saturday morning followed by clouds in New England