We've gone at the end of August for years. August in Central Florida is hot, hotter than the hottest hot. I'm from NJ and it's nothing like here. Sure we get hot days, but they ebb and flow and it cools off at night. Central Florida is just a wall of heat in August (and other months).
The other issue is the daily storms. Sure rain is fine, but when you get daily lightning storms that shut down rides and pools, as well as being a little bit dangerous, it limits how much you get done. And the old go-back-to-the-resort-and-swim strategy doesn't always work either if there is a lightning storm. We started scheduling a morning to swim because there were so many afternoons that got stormed out at the pool.
The end of August can be decent for crowds. We just went over Presidents Week and the crowds were atrocious, I would take August with its heat issues over that week anytime.
Last August trip, I swore I wouldn't do it again because of the heat. But being tied to a school calendar, my choices are crowded breaks or summer heat.
Some people pledge they will never go during the crazy hot season, some go every year. Sometimes you just have to go when you can go, whether its crowds or heat, and make the best of it. If you do it, just go in with an expectation that the weather will limit how much you can get done each day and make touring plans that rotate in AC attractions, even the second-tier ones, to make sure you get enough cooling time throughout the day.
I think it's worth trying once if that's when you can go.
Good luck deciding!
