The Kracken:Bath tub temp for most people is somewhere in the 102 to 108F terperature range.
Yeah, my wife is like that. You can cook lobster in her shower or bath. If I get much above 90, then it foils the purpose of getting clean since I start sweating.
A couple of months ago we went to Eleuthera, Bahamas for our 20th anniversary. I went diving in 82 degree water in just swim trunks and my dive gear. Did some shallow dives of 15-25 feet for 80-90 minutes and was still plenty warm.
But I also know people that start looking for a dry suit for anything under 70.