The most dangerous heat is 70F, 50% humidity, & 97% bear.About this time last year I was in Fort Lauderdale and it was in the 90s with humidity in the 90s as well.
Had a friend who was from Guangzhou China and when he retired, he and his wife considered Florida, but it was hotter than Guangzhou when he was in Florida so he retired elsewhere.
But with that said, I was in San Diego, once and it was over 100 and I was in Las Vegas once and it was 116, with almost 0 humidity, that to me is more dangerous than humidity in the 90% range