We go in early October - expect crowds. You'll hear: Oh, the level is great, crowds and weather are wonderful! The truth: It is hot and crowded. Is it better than summer? Yes, but for the crowds alone, summer handles them better. Everything is open, they're open later at night. October sometimes has big rides down for refurbishment (funneling more people into the parks instead of in line for Big Thunder Mountain, for example). Temp is usually in the 90s (occasionally 80s) and - as an example for a standby lines for Buzz Lightyear last time we went - were over 90 minutes by noon. The last few years we've gone, they've extended park hours because of more people than expected. We got off the phone with Disney a few weeks ago and the CM warned us that the first week of October is already crowded and filling up more by the day. If I had my choice, I would go in September, but we're at the mercy of school and work schedules. It's still hot, but crowds are lower in September.