What's the temperature in Shanghai at the end of September?

The end of September is the end of the autumn tiger, and the highest temperature is still above 30 degrees.

I suggest you wear an undershirt and a coat, because at that time, the temperature difference between morning and evening is large, so an undershirt is enough during the day and a coat is needed at night.

Basically, the weather in Shanghai really started to get cold after the National Day holiday.