Should the air pressure be lower than the standard value when the road is slippery and the weather is hot?

When the road surface is slippery and the weather is hot, the air pressure will be lower than the standard value.

This is because:

First, when air is heated, the expansion density decreases, thus reducing the air pressure.

Second, the road surface is slippery and the weather is hot, indicating that the air is relatively high and close to saturation, and the water can no longer evaporate. At this time, people will feel sultry and uncomfortable, and sweat will not evaporate easily.

Because the density of water vapor is less than that of air at the same temperature. Therefore, when the relative humidity of air is close to saturation, the air pressure is further reduced.

At this time, if the temperature drops slightly or in the evening, it will lead to water vapor supersaturation and form rainfall.