We had a blast in September. It was Hot, but we live in West Texas, heat doesn't bother me very much... and it did rain everyday, usually in West Texs it doesn't rain very much but this past summer it rained alot..

So we enjoyed the rain but wished it wouldn't have been there when we were there. But better then a hurricance. We also had plans to attend the opening night of
MNSSHP, 09/14/07, and it down poured for over an hour, so we missed the parade and Wishes. (We went back to BoardWalk)
I waited to late to make ADR's, so we didn't get to eat at California Grill or other fancy places, I was pretty mad at myself for that, so make your ADR's ASAP. We did eat at Liberty Tree Tavern, YUM, Yacht Man's YUMMY YUMMY, Sci-Fi Theater that was okay, but most of the time we just had walk ups.
I didn't think the parks were very crowded, you can check out my trip report to see what the crowd's looked like.
http://www.disboards.com/showthread.php?t=1596478
We have only been twice and the first time was in July/Aug. So we thought the parks were pretty empty. We did hit a holiday for people that lived in the North is was Rosh Hashanah, and so alot of New Yorker's were there on a fall break...
The longest wait for any ride was 1 hour for Soain, but that was on the boards that you see when you get into Epcot, we only waited 30 minutes. We wait 40 for Dinousour in AK. But other then that 15 minutes or more. EE we walk on.... No wait. of course it's a long walk but no wait. We hit MK on a Monday, and that morning we walk on to Peter Pan, Snow White, Small World and all the other rides in Fantasyland. We walk on to Space Mountain, came off and went right back on and rode the other side.
We plan to go back Sept. 19 - 26th. Hopefully well get the Disney Dinning Plan, waiting patiently for the dates to come out, we didn't do the bounce back at the time it was offered. Hopefully not as much rain and maybe less people because Rosh Hashanah is on the last week in September and we're going the week before.
Good Luck
Texasbelle