We were there in September of 2014, as well as September of 2013. The crowds were awesome, but the weather was hot, hot, hot! This year my older daughter started kindergarten, and we decided to move our vacation to November, so she wouldn't miss any time at school right after starting. While the crowds were a bit heavier in November, they still were excellent! We win the week before Thanksgiving, and while there were a few crowded days, there were many days which were not very crowded at all. The weather was also perfect! Every day I was in the low eighties, perfect for swimming entering the park. We were also able to wear light jackets in the evening, so it wasn't too hot, and felt like perfect fall evening. I understand that November can be a bit hit her then, so I think we are probably very lucky. But the weather during the November trip this past year was by far the best.