We went August 27 to September 7 in 2003. It was brutally hot, rained every day for an hour or so, but who cares, you are in Disney! Seriously, though, the parks weren't bad on Thursday and Friday, MK was horrible on Saturday, but things settled right down on Sunday by Monday (Labor Day here in the states) it was great. We went on every ride with no line, and had a blast that week.