I walk here on the gulf coast of Texas and every weekend I see ~100deg with lots of humidity. The tricks I use are dress very cool, drink a lot of water before you start and while you are playing, and bring a towel that you can wet at every cold water dispenser. Putting a cool towel on the back of your neck or even pouring some cool water down your back will keep you at a good temp. Also get you and umbrella for your cart as that will help keep you cooler too.
During the week I play in the evenings and that is much easier. It is a lot easier to start playing when its hot and finish when its cool.
If you do start feeling heat exhaustion symptoms you should always stop and cool off. Heat stroke is not fun and can kill you.