We have gone mid to late August 11 years in a row (teachers - our summer holidays). It is hot and crazy humid, but the crowds have been very manageable. We are big rope drop people (so we can break from parks around 2-5 when it gets busy and hot). We get a lot done early, keep hydrated, take air conditioned breaks / meals, and use our FP+. We are going back for our 12th August trip in a row, so we think it's great! We've been at Christmas before and that was way too busy - we are quite happy with August. Like any trip to Disney, a little planning and preparation goes a long way. Have fun and happy planning!