Is the air pressure low or high when it rains?

When it rains, it is low pressure.

When there is a low pressure system, rainy weather will occur, because the low pressure system indicates low pressure near the ground. The reason is that the air in the vertical direction The direction of movement at that time was vertically upward from the ground. During the upward movement of the air, the water vapor in the air condensed to form precipitation when it reached high altitudes.

The weather controlled by the high-pressure system is sunny, because the high air pressure near the ground means that in the vertical direction, the air mainly moves vertically downward. The closer it moves to the ground, the higher the temperature. The more difficult it is for water vapor in the air to cool and condense to form precipitation. So the weather is sunny. Like

Our usual autumn weather with clear air and clear air is often caused by high-pressure system control.