What clothes should I bring to Zhangjiajie in Changsha in early May?

If you come in early May, the temperature is not low because of strong convective weather? It's over 20 degrees, but it's still uncomfortable to rain and wind. I suggest you wear a long-sleeved T-shirt or a long-sleeved shirt (short is ok). Pants must not be shorts, because it is troublesome to rain. I'll give you a picture for you to see. It rained a lot these days.

What if it's into the mountains? Do you want to take a coat? Not too thick? Like a jacket? But it is used less? Just wear it when you go out at night (it's cold in the mountains at night)