Why is it easy to rain in summer afternoon in the south?

In the southern coastal waters, the land is colder than the ocean at night, so the land pressure is higher than the ocean pressure, which leads to the air flow blowing from the land to the ocean, while the land is hotter than the ocean during the day, so the ocean pressure is higher than the land pressure, which leads to the air flow blowing from the ocean to the land, thus bringing the warm and humid air flow from the ocean to the land and forming a cloud capable of precipitation, but the formation of the cloud is not instantaneous, so it rains in the afternoon after noon accumulation. The airflow is dry at night, and it is difficult to rain in the morning.