Boston/ Weather & Environment

Sunny Boston Halloween, Then a Bone-Chilling Night

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Published on October 31, 2026
Sunny Boston Halloween, Then a Bone-Chilling NightSource: Google Street View

Boston is starting Halloween under clear skies and temperatures in the mid-40s, with sunny weather expected to push the city near 53 this afternoon. Northwest winds will run 6 to 15 mph, giving costumes a breezy test before the candy haul begins.

Sunny Afternoon, Brisk Evening

The forecast calls for dry weather all day Saturday, with sunshine lasting into the late afternoon. According to the National Weather Service, winds should ease after sunset as temperatures fall quickly toward a low near 34.

Early-evening trick-or-treaters can expect readings in the upper 40s, followed by colder conditions later at night. A warm layer will be useful for anyone staying outdoors after dark, especially with clear skies allowing the chill to settle in.

Clock Change Brings A Longer Sunday Morning

Daylight saving time ends overnight Saturday, so clocks will turn back one hour early Sunday. The extra morning hour arrives with another sunny day and a high near 59, while west winds remain light around 8 mph.

Warm Week Ahead Before Rain Returns

Monday and Tuesday will bring the warmest stretch of the forecast, with mostly sunny skies and highs near 67 and 66 degrees. Wednesday stays mild near 66 but turns partly sunny, with clouds thickening ahead of the next weather change.

Rain chances rise Thursday, when showers could begin after 7 a.m., then increase Thursday night and Friday. Showers and thunderstorms are likely Friday, with a 60% chance of precipitation and a high near 63, according to the latest forecast.

That outlook is a cooler and more detailed update to Hoodline's earlier Boston forecast, which also flagged a sunny Halloween but had less clarity on the late-week rain. For Saturday, the takeaway is simple: dry skies for daytime plans, then a decidedly cold finish.

Boston-Weather & Environment