The same thing happens with your tires every day. You can then leave the balloon sitting on a table at room temperature, and it will begin to grow in size again. When you pull the balloon back out of the freezer, it will be significantly more deflated-looking than before you put it in the freezer. You can see this effect in action by filling a balloon with air and putting it in your freezer for an hour. When air heats up, it expands and contracts when it’s cold. Air pressure increases or decreases by 1psi to 2psi for every 10° temperature change. This chart demonstrates the change in tire pressure as ambient temperature changes. If you’re only noticing a drop in tire pressure of a couple of pounds when you get in your car or truck in the morning, chances are it’s a normal pressure drop due to the cold air inside your tires having contracted and exerting less force on the tire. If your tires are losing 10 psi or more overnight, you can be reasonably sure the reason isn’t due to temperature. But there are many other causes to consider. If your tire loses air overnight, it could just be the temperature outside. Tire pressure drops 1 psi for every 10-degree drop in temperature.Ī significant overnight 10 psi pressure loss is likely due to a slow leak from a valve stem, small tire puncture, poor rim seal, or damaged wheel. Why Is My Tire Losing Air Overnight? All tires lose air pressure slightly when they get colder. It could be due to temperature or tire leaks. Jumping in your car or truck in the morning to head to work and seeing your tire pressure monitoring system (TPMS) light warning you about low tire pressure is frustrating.
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