Why is it hot on the first day and rainy on the second?

When the weather was very hot on the first day, the air was heated, the temperature dropped, and the water vapor in the air was supersaturated, and it rained the next day.

1. Rainfall refers to the weather phenomenon that condensed water vapor in the atmosphere falls to the earth's surface in different ways. Almost all water vapor in the atmosphere is concentrated in the troposphere. The higher the temperature, the more water vapor the atmosphere can hold, and vice versa. At a certain temperature, when the air can't hold more water vapor, it is called saturated air. When the water vapor in saturated air matches the temperature, there will be no water vapor condensation, but when the air reaches the supersaturated state, excessive water vapor will be generated and water vapor condensation will occur.

2. The formation of supersaturated air is mainly due to the upward movement of air, which makes the temperature drop and forms supersaturated water vapor; Coupled with the role of condensation nuclei with strong hygroscopicity, water vapor condenses into clouds, and the volume of cloud droplets and ice crystals coming out of the clouds is too small to overcome the resistance of air and the support of updraft, thus suspending in the air. When the cloud continues to rise and cool, or the water vapor outside the cloud is continuously input into the cloud, so that the cloud droplets are increasing and the updraft can no longer stand it, it can fall from the cloud, forming rainy weather such as rain, snow and hail.