Whether it's playing in an oven or a sauna, it's hard if that's not what you're used to. Players and umps passing out during summer tournies in FL isn't unusual. Heck, it can even be a problem in January when the players from the extreme North come down for Christmas Camps --- their bodies are prepared for below freezing, and they come down here to 65F and sweat like it's the 4th of July!
I don't believe I've ever heard the weather reports in Orlando say it's over 100 here; even when my backyard, in-the-shade-thermometer said it was considerably higher than 100F. I think there's an agreement to NEVER let the tourists know how hot it really is, or they won't leave their hotel rooms!