I don't know if it is commercially available yet, but recall a newly developed paint within the last couple years which is so reflective that it does not get the enclosed space warmer than ambient, even in direct sunlight.
I'll have to go looking to see the name and if or when it might become available.
The Kitt Peak Solar Observatory about 60 miles west of Tucson has a long exposed structure to keep the optical path cool from the giant mirror at the top reflecting down into the instruments. I recall it had a sort of odd color, and the information on the self guided tour said that the special formulation had titanium as part of the ingredients to keep it cool.
Ocala might have more info, but when I toured Cape Canaveral, it was remarkable how much the structures and piping above ground was getting weathered and beat up by the elements, including the sun.
I was impressed by carports at some of the hospitals in the Scottsdale area, and indeed walking out of the sun into the area under the metal shield, which was giving about 6 or 8 feet of clearance above the car and open on all sides, attested to the shielding. Ambient air for some distance around would be influenced only by the surrounding microclimate of the sun exposure. Rain sensors, if needed, could be located well outside that large shield. Not practical for a back yard necessarily, but we're talking Sonoran or Mojave Deserts, and if the project were to do it right, I'd opt for some secondary shielding and free air flow through.
Cats seek out sunlit patches on the carpet during the winter, so there IS energy in sunlight.