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