Last year we were there the 3rd week in August and yes it is hot, but that depends on what your definition of hot is. I live on the east coast in Virginia and we have hot humid weather, so I found Orlando to be very similar, so the heat didn't really bother us, we just drank lots of water and slipped into AC buildings when we got really hot. The crowds were a bit heavy but it was also the 1st week of Free Dining too, so we expected it. We are going the last week in August this year instead so I'm expecting the temps and crowds to be similar, maybe a bit less crowded, but we are planning to have a great time.