I've solved the humidity problem: get comfortable with being sweaty. High heat on the other hand, especially in combination with humidity, would have serious effects. Where I'm from, it occasionally will get to 110F, and rarely 115F, sometimes higher (albeit, with low humidity). I've seen recycling bins melted to the sidewalk on the hottest days.

How much water do you (reader) drink in a given day? I wonder how drastic the effects of heat and sweat vary, depending on how much water a person has.