I use a LL Bean Stowaway rain parka, Totes overshoes (high top) and rain pants. I had the local dry cleaner replace the velcro pads on the raincoat with snaps so that I can get better venting when not using the zipper. Breathable fabrics like Gortex are great, but there is no way you can ride comfortably in a summer rain without good venting.
You also need a rack to store your rain gear when riding and a set of fenders. You don't want to be in the situation of having to wear the rain gear in the hot sun just to protect against water sprayed off your tires. Also, Florida tends to have brief intense rainstorms, so you may only need to wear your raingear for a few minutes during your ride.
You will have to ride at about the same level of effort that you would walk at when wearing rain gear in the summer. Otherwise, you will be as wet with the rain gear as without.
Paul