I went last year from 9/25-9/28 and it was brutal. It rained periodically, but the humidity never abated. At times, I thought the humidity felt worse after it rained. I can bear the heat, but I never experienced humidity like that before. I had only been to Florida in December and February before that trip. It wasn't my favorite, but in order to experience
MNSSHP and F&W, we are going around the same time this year. Don't let it deter you unless you are miserable in the heat. Just be prepared that it will likely be very hot and humid.