I've lived in Arizona for about 38 years. I finally found a solution to riding in the middle of the summer.
I don't. I treat July, August and September like winter in Minnesota.
But since you're likely much younger than I and can't bear the thought of parking the bike many of the solutions already posted will help. Jet Hot coating has a facility in Tempe. I coated my headers shortly after I bought the bike and it helped some. Replacing the stock system with Jardines helped more. Assuming you're wearing full length boots already exhaust modifications (and associated tune changes to add fuel to the mixture) should help.
Or, you could try wearing full leathers and a full face helmet. That way the rest of you will be so miserable you'll hardly notice your cooking leg.