I notice that tire pressure varies when the tires are hot vs cold. About how much should the PSI be when the tires are hot such as after driving 15 to 20 minutes in the middle of the day ?

I notice that mine were about 35psi but the car had been driven for a while.

Thanks,

 

That's a very tough question to answer - way too may variables. Just check'em when they're cold and you'll be fine as long as your gauge is accurate.

 

raymo19 is correct. You want to set the pressure for street tires cold not hot.