What should I wear in this weather in Fuzhou?

Not cold. Short sleeves are usually worn here now, but long sleeves are recommended, because it is already September, and the temperature is relatively cold in the morning and evening. If it rains, the temperature will be very low I don't know where you will come from, but if it is the seaside, you should take a long sleeve. Summary: Don't wear a coat, wear a short-sleeved coat and be prepared. I hope it helps you.