All pressure recommendations, label or tire sidewall, are cold pressure.
The best time to adjust tire pressure is early morning before the sun starts to warm the tires. You will be amazed how much pressures will change just from a few minutes of sun.
If you really want to see the effects. Set your tire pressure early morning before the sun comes up, then mid morning check the pressure again. The tires facing the sun will now read a couple lbs higher. I'm a bit anal when it comes to my tires, but I like all of them to have the exact same amount of air. Yes they will change a bit from one side to the other as I travel depending on location of the sun, but at least I know they all started with the pressure they need.
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Brent
2013 Alpine 3500RE
2019 Silverado 2500HD Duramax
U.S. Air Force Retired (25 yrs)
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