Can rainy days lead to lower tire pressure?

The temperature change is not enough to cause this degree of pressure drop.

In rainy days or when a cold car is started, low tire temperature will lead to a decrease in air pressure. After driving for a certain distance, the tire temperature will increase and the tire pressure will increase by about 0. 1-0.2. As long as the tire pressure value is kept at around 2.3-2.5, it will be fine.

Compared with the dry road surface, the tire pressure is slightly lower in rainy days to increase the tire contact area and increase the tire friction.

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