Why does humidity make hot days feel more miserable?

If you’ve ever wondered why it can sometimes feel stiflingly hot as your clothes quickly dampen on a summer afternoon, humidity is the likely culprit.
Because of humidity, which is a measure of the air’s water vapor content, the body’s perspiration evaporates from the skin at a much slower rate.

“Evaporation is a cooling process,” said AccuWeather Senior Meteorologist Dave Dombek. “If you step out of the pool or a lake, you get a chill because the air is very dry, and that water almost instantly starts to evaporate off of your skin so that it cools it.”
According to the MIT School of Engineering, the rate at which water or sweat evaporates depends on the level of water currently in the air.


https://www.accuweather.com/en/weather-news/why-does-humidity-make-hot-days-feel-more-miserable/70002207