The question like does tire pressure change with the weather definitely sounds like a myth. But sometimes when you are on the road and your tire pressure light goes on, you can blame it on the weather.
How comes that tire pressure change with the weather?
There is a basic relationship between the change in temperature and pressure, which we all know about. When in a cold, things have a tendency to shrink, and when in hot to expand. Therefore, it doesn’t come as a surprise that when the temperature outside the tire changes, it affects the pressure inside the tire.
In the fall and winter, when it is usually cold outside, the pressure in your tires will be lower than usual, especially if you have been keeping your car outside during the hot summer months. After the hot weather, the first major cold wave will affect your tire pressure, which will set off the alarm on the TPMS.
If you still wonder does tire pressure change with the weather, you can check it for yourself. The truth is that tires lose pressure daily. In cool weather, a tire will typically lose one or two pounds of air per month. In warm weather, tires lose even more air. This definitely answers the question does tire pressure change with the weather.
Even if the alarm is usually more prone to go off when the tires are slightly underinflated, it can also happen when they are overinflated. If you are driving a car for some time, the TPMS alarm will go off. This is because the friction causes the tire to heat up, incising the pressure in the tires and giving inaccurate misleading high-pressure readings.
Is there any other reason for TPMS alarm to go off?
What can also set off the alarm on your TPMS is hot summer weather, especially if you have a tendency to keep the car outside unprotected from the direct sun and the summer heat. The same goes for the cars left outside during a cold night. The vehicles left outside unprotected, no matter the season, will have more pressure changes in tires during the time, and an alarm will probably go off more often. If you are annoyed with this alarms going off, try keeping your car in the garage if possible. When that isn’t the case, you can also make sure all tires are indicated in your manual at the PSI, after you check your tire pressure monthly and during the morning when tires are cold.
If your TPMS light comes on, immediately check your tire inflation. Good idea is to get a portable air compressor in your car, to help you with your underinflated tires when you are away from your home or any gas station or have a dealer check it for you.
If you are running your vehicle on underinflated tires, it will have a negative effect on your fuel economy; your tire wear will increase and your car will have a better chance to break down in near future. Therefore, keep your tires correctly inflated and check them more often.