A trick I learned after moving to Florida is to install vent shades.
These are plexiglass pieces fitted to the top of the windows that allow the windows to be open a couple of inches while it is raining but still not let water in. If you park your car with these and open each window 1/2 inch, the rain won’t come in but the heat will go out.
It keeps the car within a few degrees of the outside, not 80 degrees higher.