Best thing is: Just ride. If you're feeling really hot and stressed, just take it a little easy.

I'm a former northerner, and used to complain if it was above 70*F. Moved to the somewhat-South 16 years ago and took up riding. I found that just the movement from the air when riding was helpful on hot days. I'd take plenty of water, and stop and rest if needed, and not kill myself.

It wasn't too bad! I was dreading how it might be...but really, I found myself riding when it was in the high 90's without even giving it much thought. And then, that very first season of riding, I did a hilly 26 mile loop (a lot for me, at the time) and saw on the thermometer when I got home that it was 108*F! And it wasn't bad at all.

It seems like from that time, on, I no longer had a problem with the heat! Doing work outside, or riding, whatever, I just don't even pay attention to what the temp is anymore. Riding when it's hot acclimated me to the heat. I'm really glad that in my 50's, I no longer have to dread the hot weather!

Now the only thing is: I can no longer tolerate the cold!!!!