Last year we took DS out of school so we could go in Sept because we read so much about it being the slowest time. Well, we are doing it again this year and can't imagine ever going at another time until we have to or we have enought points to take a second trip in the same year. We arrived on the Sunday before Labor Day last year and stayed for a week, same plan again this year. Except for that first Sunday the crowds were so small the Fast Pass machines were never turned on the rest of the week. Longest line the entire trip was less than 10 min. Sept. can still be very hot, wasn't last year, but we go to the parks in the AM and PM and swim at the resort or go to a water park during the middle of the day. The park hours are shorter, but you can do more at the parks in less time and have that extra time to do otherthings at the resorts. Also, it is great with small kids because long lines and small kids are a receipe for disaster no matter what the weather is.