What's the temperature in Suzhou and Hangzhou in September?

There is no difference between Jiangnan in September and summer, and the temperature is basically maintained at 30 degrees.

The only difference is that it will be cold for a day or two occasionally, because typhoons follow.

Suzhou is hardly affected by typhoons, so it may not be cool. Because Hangzhou is farther south and closer to the sea than Suzhou, it usually cools down and rains when typhoons come along the southeast coast. This kind of day is very comfortable. However, typhoons have never affected Hangzhou except cooling down, raining and blowing a little wind, so don't worry.

Therefore, it is recommended that clothes are basically summer clothes, but at least one thin long sleeve should be brought.