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The most humid week of summer

The most humid week of summer

Update #662: Here comes the Hudson Valley's most persistently humid week of summer — so far.

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Ben Noll
Jul 13, 2025
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The title says it all. Prepare for very muggy conditions in the Hudson Valley this week, which will fuel occasional downpours and maximum heat index values near 100 degrees from Tuesday to Friday.

You’re not imagining things: it has been more humid than normal this month (and summer), making New York feel more like Florida.

Dew points, a measure of humidity, have been well above-average in the Hudson Valley

Behind the persistently high humidity has been frequent southerly winds, which have transported warm and moist air from the tropics. This wind pattern isn’t necessarily unusual for summer — but nearby sea temperature patterns are.

Extremely warm seas line the Eastern Seaboard and Gulf — an ongoing trend that has been exacerbated this summer — adding extra moisture to the air.

Check out how unusually warm the Atlantic is:

The warm water could even fuel a tropical storm in the Gulf later this week.

A dash of good news is that humidity may briefly subside next weekend.

How humidity is changing in the Hudson Valley

How humidity is changing in the Hudson Valley

Ben Noll
·
Jun 28
Read full story

The week ahead

The highest chance for downpours will be on Monday, Thursday and Friday, mainly during the afternoons. Deluges this week could result in localized areas of flash flooding.

Surging smoke from wildfires in Canada looks to remain north and west of the region for now.

Monday: partly sunny and very humid with heavy showers and thunderstorms developing, mainly after noon; localized areas of flash flooding are possible

Tuesday: very humid with an afternoon shower or storm in a few spots

Wednesday: like Tuesday, but slightly hotter

Thursday: partly sunny with extreme humidity; scattered-but-heavy PM downpours possible

Friday: hot and extremely humid with a chance for heavy PM downpours

Saturday-Sunday: there’s a decent chance that conditions will turn less humid, though a chance for some rain could return as early as Sunday, though it’s not set in stone

Note of meteorological interest: Friday, July 18, is the hottest and most humid day of the year in the Hudson Valley on average. It will live up to expectations this year.

After a short break from high humidity, looking ahead to the week of July 21, signs are that above-average heat, humidity and downpour chances will return to the region.

If you’re up for some additional reading, here’s a gift link to my article in the Washington Post this week: It didn’t take a hurricane to cause deadly floods in Texas and North Carolina.

Hope your week comes with an above-average amount of good things! ✌️

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