I was there last year for the last week in Oct-- and first week in Nov. The weather was great!! Really warm mid to upper 80's many days. Some scattered rain, but not too much at all. Really muggy though.
We were there last year from Oct. 18-25th and the weather was perfect. It was warm enough to swim but not too hot that you were dying in the parks. No rain whatsoever (at least not while we were out in the parks).
I live about 90 mins away (Tampa Bay area) and the weather that time of year is fabulous! You might want to bring a sweater or wear jeans at night even. Of course I live here, so what's chilly to me, might not be to you.