Boston

Boston Basks in Sunny Skies and Mild Temps Before Weekend Heatwave and Thunderstorm Chances

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Published on July 21, 2025
Boston Basks in Sunny Skies and Mild Temps Before Weekend Heatwave and Thunderstorm ChancesSource: Google Street View

Bostonians, wave goodbye to the tempest; a stretch of sunshine is yours for the taking as we head into the workweek. According to the forecasts reported by the National Weather Service, today's climate bows with a generous high near 78 degrees and a calm northwest wind, pressing in at 8 to 16 mph. As the day rolls on, a tranquil night takes the stage, where temperatures will dial back to a cooler, yet amiable, 58 degrees.

Harbinger of fair weather, Tuesday will dawn sunny, its zenith cresting near the 78-degree mark with a whisper of a northwest wind that will later flirt with the east by afternoon. And not to be outdone, NBC Boston remarks that "Sunshine will be plentiful with a light breeze" persisting through a day canvas painted in clear skies and low humidity. But a word to the nocturnal: the night will follow suit with the cooling trend, bringing lows in to the 50s.

A surge of warmth is on the horizon come Wednesday, with the mercury promised to rise to near 83 degrees amidst a backdrop of cool southeast gusts. Evening-wise, the city slides into a partly cloudy state with a merciful 69 degrees as the lowest ebb. It's a prelude to what awaits toward the week's crescendo.

Thirsty for some summer sizzle? Thursday to Friday won't disappoint, with heat stacking up to a sweltering high near 96 by week's end. Add the touch of potentially gusty southwest winds, and "Heat index values may reach 100 to 105 degrees Friday afternoon," warns NBC Boston. Though the furnace of a day may temper into the weekend, it's still an embrace of notably warm and humid air that holds sway.

Boston's affairs with the clouds aren't in the rearview mirror yet, though. A chance of thunderstorms on Friday afternoon sets the stage at a 30% probability, with similar odds extended into the night. Saturday's forecast doesn't stray far, flirting with a chance of showers, partly sunny skies, and a high near 84, and the pattern follows suit into the evening. Sunday continues the trend; partly sunny, with thermometers topped out around 83.

Boston-Weather & Environment