Why is it hot and rainy in Guangdong for half a day this summer?

Because Guangdong has a subtropical and tropical climate, it is hot and humid in summer.

So a lot of water evaporates, and then cloud gas is formed in the sky until the water vapor in the cloud reaches a certain level.

It turns into rain when it is saturated.

This is "convective rain", which usually occurs in subtropical and tropical areas, and the time is from 2 pm to 4 pm.