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It's called 'heat soak', and especially noticeable on turbo cars.
The most common solution is to either fuel up higher octane fuel (89,91); fuel up with E15, or if you already fueling mid-grade, fuel up with premium.
If you're concerned about cost, the most cost efficient method is to add 1 gallon of E85 in your tank (of 87 octane fuel).
E85 isn't very fuel efficient, but it does costs less, and allows your engine to dial back on engine timing delay caused by predetonation.
A lot of cars have problems with 'pinging' or predetonation in hot climates.
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