When does it usually turn cold after summer?

Although it is very hot now, the summer heat that began on July 20th will make people feel even hotter. Because the air humidity is high after the fall, it is called "sauna day" and it will last for one month. The temperature is still high in September, but the humidity is not so high.

After beginning of autumn, I felt the sky was high and the clouds were light. It's windy, and I won't sweat too much. The air humidity begins to decrease, so it won't be very stuffy. It began to get cold around the eleventh night.