> Uncomfortable heat has nothing to do with temperature and everything to do with air humidity

That is not correct. Heat, wind and humidity all contribute.

In a dry air with no wind, your body creates a "hot and humid" bubble around it if you are not moving. A fan helps.

Humid but neither cold nor hot air may not feel great, but not that bad.

Hot and humid air with no wind, now that's bad.

Edit: I know because I added shades and fans.