HI @Marilu47 ! It sure does get hot in Florida! My boyfriend is from Miami and we visit almost every year! If you're looking for specific bike jerseys/tops, they are typically form fitting and have the back pocket for goodies! If you are not looking for that style, then you are in luck, there are so many great loose fitting, moisture wicking tops to choose from! Here are a few options that are my favorites; you can also check out this link for other wicking shirts and there will be lots of options:
The key is to look for shirts that are not made out of 100% cotton, moisture wicking material, breathable and BONUS, some even have sun protection!
Hi @Marilu47 ! I live in Maryland, and, it's not quite as hot as Florida, we get pretty close, and share the same high humidity. On most longer rides, I wear a 10L Osprey hydration pack. While this is not a "top" per se, I have found that if I fill the hydration bladder with ice before filling with water, it not only provides me with plenty of cool water to drink, but keeps my back nice and cool. Not exactly the answer to your question, but thought I'd throw it out there.
I can also attest to the Patagonia Capilene Cool that @REI-JennyA recommends. Of course, mine is the men's version, but it does a nice job. And, while not really designed specifically for biking, Outdoor Research also has their Echo line of shirts that are good for hot & humid weather.