Will it be cool in early autumn?

The weather will be cooler after beginning of autumn, but the temperature will drop slowly.

Generally speaking, the temperature will not drop immediately after beginning of autumn, but it will drop gradually.

After autumn, although it has reached the crisp autumn season, it is still summer climate in terms of climate, and the temperature difference between morning and evening is not big. It will take another month for the temperature to be significantly different. It is recommended to do a good job of physical maintenance in daily life and blow air conditioning at night to avoid catching a cold.