[kev009]

This is a bit on an exaggeration, it's not pleasant but it takes time and effort to overheat. At 80% perspiration and evaporation are still working so keep damp.

If you have access to a steam room at a gym you can experience a likely higher temperature depending on the room's thermometer (pour some cold water on it :)) and full condensation for yourself.

The primary issue with extreme humidity on top of extreme heat is that perspiration can become nearly ineffective. High heat, lower humidity isn't that bad provided you have enough fluids to stay hydrated.