The heat and humidity in Florida during September and October has to be experienced to be believed. Some really serious towering cumulus generally appear at around mid-day and they scare me for sure! Take your alarm clock with you and get your flying in early and watch the storms from the ground. Best flying from the crack of dawn till mid-day ish. Try to go after the end of October if possible, the weather is usually a lot better although I went last December and the ceilings were down to 1000ft for most of the day for the best part of 10 days!