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If you are wondering if high temps are an issue for the car to wash it, the answer is, no. Direct sunlight is what you need to avoid when washing a car, as 2 things can happen. First the water will dry to fast, and you will likely end up with water spots. Second, the water droplets can act like lens, causing problems to the clear coat.
try using Optium no risne. (ONR) I wash my car anytime I want I just do one panel at a time when its SUPER hot. I even have washed the whole car at once in 100+ and had ZERO waterspots.