We’ve been in June, July, and August and it’s hot and humid, but I don’t remember any of our summer trips being overly rainy. In fact, on our last June trip it barely rained at all and we were hoping it would so that it would cool things off a wee bit, even for a short time. I’d plan on an afternoon rain shower or thunderstorm.
We are traveling to Disney this August and I’m not the least worried about the rain.