I live in a similar climate. It's hot without reprieve starting July 4. Sure, it's hot before that, but the evenings cool off.
That said, I went to DW 7 mos pregnant in July one year. It was the year we had a drought and record highs at home, so Florida was an improvement.
The key to enjoyment and survival was going to the park at RD, staying until 11 am, leaving and crashing until 5 or 6 and head back.
There is a lot of spill over a/c from the rides which helps. And, you can cool off on rides and such. So, you're not in constant misery.
If my super pregnant self could do it, almost anyone can. We had a blast. August might be pushing your luck.