July and August can be, and usually are, insufferably hot and humid. No getting around that. The dog days of summer rings true. However, almost all the country is baking during the summer months. September and October bother me more than July and August because I am expecting a break from the heat and it doesn't really come until mid to late October.
The mitigation to the heat and humidity is you have the beaches where the temps are relatively more mild and you'll have some breeze. Indoor, screened in pools are common and it's not hard to find a home with them.
One of the biggest bummers to me down here is you really can't swim in fresh water lakes, ponds, rivers, etc. Alligators are in all of them. And you can't forget about cottonmouths either.
Recreational boating is very popular too with a bunch of barrier islands and sand dunes that draw thousands. This area is sometimes called the Redneck Riviera. If you're not in to getting and buying a boat for yourself, make friends with someone who has one. Throw $50 their way every other time you join them for gas and bring your own cooler, food and ice and you'll always have an invite in the future.