25% increase in tire pressure during the day (above max)

Tire pressures listed on sidewalls are cold (not driven for at least several hours. even longer when it's hot outside) If you have been driving, the tires heat up even if it's not hot outside, though not as much. Friction causes heat that raises the tire temp. It does this by tread friction on the road surface and by the side wall flexing (friction) that occurs with driving. An under inflated tire will flex more and get too hot leading to catastrophic tire failure.