TIL the term "wet-bulb temperature": https://www.iflscience.com/environment/why-is-everybody-talk...

tl;dr: It's essentially just a humidity-adjusted temperature, like wind chill factor for hot weather. The important figure to know is that a wet-bulb temperature of 35°C / 95°F (equivalent to that temperature at 100% humidity, or higher temperatures with lower humidities) will kill everyone.

This makes me wonder if it is (or will become) economical for cities to use renewable energy to dehumidify the outdoors, and if so whether the yield of water would actually be useful.