Is it cool in early autumn?

It won't be cold in the morning and evening after beginning of autumn, because it won't fall immediately after beginning of autumn. Judging from the seasonal division in the meteorological sense, only when the average daily temperature is lower than 22 degrees Celsius for five consecutive days will it enter autumn.

Beginning of autumn is 13 of the 24 solar terms;

This is the first solar term in autumn, marking the official start of the Qiu Meng season. Generally, it indicates that the hot summer is coming and autumn is coming, and the date is between August 7 and 9 of the Gregorian calendar every year.

Beginning of autumn is one of the "four seasons and eight festivals" in ancient times. People have the custom of offering sacrifices to the land gods and celebrating the harvest.