Rest assured that track surface temps anywhere in Texas far exceed that of your California tracks. I have worked in the pits during an 8hr Endurance Race at Texas World Speedway - one of the steepest banked superspeedways ever, which regularly blew out cage tires when using the full oval - it's been a long time since the back half of the oval was torn away and the roadcourse built, using only the front straight. Anyway, the average temperature through the race was 112F. That's average, from the morning "cool" at 0900hrs to 1700hrs when it ended. The high was 125F. You could grill steaks on the pavement. There were some blowouts, and they were all soft compound race slicks. Not a single DOT approved tire failed, to include the droves of lightweight and middleweight class bikes running supersport street compounds (in that day the Dunlop D207).
Put bluntly, your desire to buy race rubber is not one based on reality, need, or a real and true advantage.