Managing tire pressure in hot weather matters in Southern California, where summer pavement can get very hot. Heat changes your tire pressure, and the wrong pressure wears tires faster and can lead to failures.
How heat affects tire pressure in hot weather
Air expands as it warms. A common rule of thumb is that tire pressure rises about 1 PSI for every 10°F increase in temperature. Driving also heats tires, so pressure climbs further on a long freeway run.
That is normal. Tire makers account for it. Therefore, never let air out of hot tires to bring them down to the placard number.
Check pressure when tires are cold
Always check pressure cold, before driving or after the car has sat for at least three hours. Morning is ideal. Use the pressure on the sticker inside the driver’s door, not the maximum number on the sidewall.
- Check at least once a month and before road trips
- Use a quality digital gauge
- Do not forget the spare, if you have one
- Adjust for heavy loads as your owner’s manual advises
Underinflation is the real danger
An underinflated tire flexes more, builds more heat and can overheat on a hot freeway. It also wears the outer edges faster and hurts fuel economy and EV range. In fact, underinflation is one of the most common causes of early tire wear we see in Irvine.
What about overinflation?
Too much air shrinks the contact patch. That reduces grip, makes the ride harsh and wears the center of the tread. Stick to the placard pressure.
TPMS lights in summer
Your tire pressure monitoring system warns you when a tire is significantly low. It is a safety net, not a replacement for monthly checks. If the light stays on after you add air, you may have a slow leak or a failing sensor. We can find the cause and repair a slow leak.
The NHTSA offers a helpful guide to tire pressure and safety.
Need help with tire pressure in hot weather?
Stop by our Irvine shop for a free pressure check and tire inspection. If your tires are worn or cracked from heat, we can recommend new tires built for SoCal conditions.
Written by the WTC service team
Wheel & Tire Connection is a tire, wheel and alignment shop in the Irvine Auto Center, serving Irvine, Lake Forest and South Orange County.
