What should I wear to Xiamen in a couple of days? The highest temperature is about 20 degrees. Isn't it a bit exaggerated to wear a skirt in this weather?

It rained for nearly 20 days during this period, and it only cleared up today, and the temperature also picked up. The highest temperature today is 20 degrees, but it will rain again in a few days. Because of the humidity, I actually feel cold, which is no longer in line with the temperature of 20 degrees. I'm wearing a coat now, and there's an autumn coat inside. If you are from the north, it is recommended to wear thick clothes when you come, which will not adapt to this cold weather.