What's the weather like in Xiamen in January? How to dress?

It rained moderately yesterday, but it actually rained heavily. Today's weather is very good. The cold wave doesn't come, and the temperature is 15-25 degrees. Dressing means wearing long sleeves inside and a coat outside is enough. If you encounter a cold wave, you should wear more clothes. During the cold wave, the temperature is usually around 8- 15. In short, if you are a northerner, this is the coolness of autumn!