Hot tyre pressures

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The Legend
 Exiled Scot in Maidstone
It's quite hot right now, and often when I want to check tyre pressures they are already quite warm, or I forget to do them and am only at a garage after driving for a bit. I know you should really do them cold, but is there a rule of thumb for doing them hot, like 2 or 3 PSI more than cold ?
 
As a rule of thumb, I wait until the following morning
 
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