Although I hate to admit it, I lived in Florida for 15 years. Couldn't get much further south without living on a key. Had a lot of cars (including convertibles), all leather and no regrets.
I lived in Miami for over 25 years and owned several convertibles with leather seats while living there. I would always put a towel on the seats because the leather would get way too hot for my back and thighs when I got in the car after leaving the top down for a few hours. It’s one of the reasons I didn’t opt for leather in my JLUR.
You can get the leather and if it’s too hot during the summer months, just put some seat covers or a towel on the seats and you’ll be fine.