How soon will Beijing start to cool down? You can wear a coat.

Judging from the weather forecast in Beijing in September this year, the daytime temperature is still on the high side, generally above 28 degrees. On the 7th of this month, we will enter the Millennium solar term. We should start wearing T-shirts and pants. Until September 19, the daytime temperature will drop to 22 degrees, so you need to wear a coat. . . After the Millennium, the temperature is still low at 18 and 9 degrees in the morning and evening, so it is better to wear a thin coat. For your reference.