We were there 3 years ago at that time (last week in Sept - first week in October) and it was HOT AND HUMID. And, we got the tail end of the love bugs (ick!). BUT, it was a nice time because I did not want it to be cool, because we wanted to swim, also. And, since kids are back in school, it wasn't overly crowded like it was for our August trip in 2003.
We got lucky and only had one day that it rained - and it wasn't even all day.
Pam