We went in September for my son's first trip and it was so hot, I said I would never go again in September. And we were there in mid September, but it was also the summer of record highs and the temps while we were there were in the mid 90's and up. Our pictures have us sweating as soon as we got to the park. We weren't prepared for it to be that hot. So as long as you are prepared, it will make it easier. Just count on it being hot and humid, and if it isn't then you should count yourself lucky.