Posted on 9/25/2026
The first truly cold night of the season has a way of making tire pressure warning lights appear all over town. Your tires may have looked fine the day before, yet the next morning the TPMS light is glowing as soon as you start the car. In many cases, nothing suddenly broke overnight. The air pressure inside the tires simply dropped as the temperature fell. Cold weather can expose tires that were already a few pounds low, which is why this problem often shows up right after a sharp temperature drop. Cold Air Reduces Tire Pressure Air contracts as it gets colder. Inside a tire, that means the pressure drops when outside temperatures fall. A common rule of thumb is that tire pressure changes by about 1 PSI for every 10-degree Fahrenheit change in temperature. So if the weather drops 30 degrees overnight, a tire that was already close to the TPMS warning threshold may suddenly fall low enough to turn the light on. Your Tires May Have Been Slightly Low Already ... read more