We have been twice in August now. Aug.'03 wasn't too bad. There was a lot of rain, but we had our trusty ponchos so it worked out okay. Then, there was last August. OMG!! We arrived the same day, but about 6 hrs. earlier than, Hurricane Charley. I have never been in such heat/humidity in my life. When people asked me why I would go to WDW in August my reply had always been..."It's hot/humid here in NE too, but Florida is set up for it. A/C, pools, water parks." After H.Charley moved on, the humidity was brutal. We were exhausted every day by dinner-time. There were a lot of nights that we were back in our villa by 7:00 due to that humidity. It just drained us.
I don't think I'll ever get my dh back to WDW during the summer months again. We were there for Thanksgiving and he fell in love with the weather then. But, dd and I would go back in Aug. again.