Todays Weather in Boston · 20 May 2026 · 2 min

Todays Weather in Boston - Wednesday - 20 May 2026

Boston shattered a 77-year-old temperature record Tuesday, and the heat isn't done — a Heat Advisory runs through Wednesday evening with storm risks ahead. Get the full forecast: what to wear, air quality warnings, commute tips, and when relief finally arrives.

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Todays Weather in Boston - Wednesday - 20 May 2026

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What's covered

Boston Breaks 77-Year Heat Record

Boston. Ninety-six degrees on a Tuesday in May.

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Heat Advisory Through Wednesday Evening

A Heat Advisory runs through eight p.m. Wednesday, with highs in the upper eighties to low nineties expected today.

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What to Wear Tuesday-Wednesday

For today and tomorrow, go lightweight and loose. Light-colored fabrics.

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Afternoon Thunderstorm Risk

Both Tuesday and Wednesday afternoons carry a chance of scattered thunderstorms. Tuesday evening has the higher risk for an isolated severe storm.

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Cool Relief Arriving Thursday

The good news is relief is close. Thursday brings a significant cool-down, and by the weekend you're looking at highs in the fifties and sixties.

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Boston Closer and Sign-Off

Boston. Ninety-six degrees in May was wild.

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