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Wednesday, May 20 – Hot and increasingly humid with thunderstorm potential

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May 20, 2026

Another very warm day is likely ahead of an approaching cold front. Temperatures may again approach 90 degrees, while rising humidity levels will make it feel even warmer. By afternoon or evening, scattered showers and thunderstorms could develop as the front moves closer to New England. Some storms may become locally strong depending on how much sunshine develops during the day. • High: 86–91°F | Low: 64–68°F | Wind: SW 10–20 mph • Sky: Partly sunny • Precipitation: 40%

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Tuesday, May 19 – Potentially the hottest day of the stretch
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May 19, 2026

Strong sunshine, southwest winds, and an increasingly warm air mass aloft could allow temperatures to surge into the lower 90s during the afternoon. Humidity levels will also begin increasing, giving the day a more midsummer-like feel. Aside from a very isolated late-day shower risk well north or west of the area, dry conditions are expected. • High: 89–92°F | Low: 66–70°F | Wind: SW 10–20 mph • Sky: Mostly sunny • Precipitation: 10%

Monday, May 18 – Very warm inland, cooler coastlines
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May 18, 2026

Warm air continues building into the Northeast, although some coastal communities may be tempered by a developing onshore flow. Waltham should remain firmly on the warmer side of that boundary with temperatures pushing well into the 80s under a mix of sunshine and scattered fair weather clouds. • High: 84–88°F | Low: 60–64°F | Wind: SW 10–15 mph • Sky: Mostly sunny • Precipitation: 0%

Sunday, May 17 – Summerlike warmth arrives
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May 17, 2026

A beautiful late spring day is expected with abundant sunshine, low humidity, and temperatures climbing well into the 80s during the afternoon. Westerly breezes may occasionally gust over 20 mph, but overall conditions will feel more like late June than mid May. • High: 81–85°F | Low: 56–60°F | Wind: W 10–20 mph gusting 25 mph • Sky: Sunny • Precipitation: 0%

Saturday, May 16 – Warmer with partial sunshine
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May 16, 2026

A warming trend develops heading into next weekend with more sunshine returning. While most of the day looks dry, a brief passing shower cannot be completely ruled out. • High: 71–74°F | Low: 52–55°F | Wind: SW 10–15 mph • Sky: Partly sunny • Precipitation: 20% chance brief showers

Friday, May 15 – Gradually improving
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May 15, 2026

The steadiest rainfall exits, though lingering clouds and a few scattered showers remain possible as cooler air aloft lingers over New England. • High: 64–67°F | Low: 47–50°F | Wind: WNW 10–15 mph • Sky: Mostly cloudy with some breaks of sun • Precipitation: 30% chance scattered showers

Thursday, May 14 – Widespread rain likely
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May 14, 2026

A stronger disturbance moves through the Northeast bringing periods of widespread showers and a damp, cool feel through much of the day. Some embedded thunder cannot be ruled out. • High: 58–62°F | Low: 48–51°F | Wind: SSW 10–20 mph • Sky: Overcast • Precipitation: 80–90% chance rain

Wednesday, May 13 – Dry early, clouds increasing late
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May 13, 2026

Another cool day is expected, though clouds will gradually increase during the afternoon ahead of the next approaching system. • High: 60–63°F | Low: 45–48°F | Wind: SW 5–15 mph • Sky: Increasing clouds • Precipitation: 20% late-day showers possible

Tuesday, May 12 – Cool but bright
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May 12, 2026

High pressure builds into the region bringing abundant sunshine but continued cool temperatures for mid May. • High: 58–62°F | Low: 39–43°F | Wind: NW 10–15 mph • Sky: Mostly sunny • Precipitation: 0%

Monday, May 11 – Cooler and breezy
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May 11, 2026

Noticeably cooler air arrives behind the cold front with lower humidity and a mix of sunshine and clouds. • High: 61–64°F | Low: 41–44°F | Wind: NW 10–20 mph • Sky: Partly sunny • Precipitation: 0%

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