Why does humidity increase as temps drop late in the day?

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Do not live near bodies of water. Also in the US south where we’ve had excessive heat warnings. I suppose the sun plays into it, but help me understand please. Thank you

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What we think of as “humidity” in the US is more accurately called “relative humidity” as it’s a measure of how moisture-saturated the air is. Specifically, it’s calculated from the temperature and the air pressure; so as the day cools and the temperature drops faster than the pressure does, the air loses some of its ability to hold water and the relative humidity rises.

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