We went this year in the last week of August up to Saturday of Labor Day weekend. It was hot! But I grew up in Houston, so I guess it wasn't too bad. I thought the crowds were pretty decent. As long as you get to the parks early, you should be in good shape to get the bottleneck rides out of the way. We were in MGM on the day Ernesto came through. They had forecast 3-5 inches of rain all day. It didn't start til 4:30 pm and only amounted to 1.5 inches, mostly overnight. The crowds were very light. We walked onto almost every ride. Disney monitors the weather pretty closely, and works to keep the parks open as much as possible. In anticipation of Ernesto, they changed evening EMH at AK to the morning, but I don't think many people went. The restaurants in MGM were obviously uncrowded, and reservations were available everywhere. The last day (Sat) we went to MK for a couple hours in the morning. I think Sat is not a good day for MK - the people were streaming in - mostly locals, I guess. Glad we left then.