The hot springs in Sanya are all 25-30 degrees now. The temperature difference of 2 1 will not be too much! You can wear a skirt at the thought of this temperature. You don't need to bring too many clothes. You can wear short-sleeved shorts now. It is not easy to bring too many clothes when you go back, because you want to buy special products. And there are clothes drying in Sanya. I suggest you buy clothes in Dalian. I have been to Dalian, where there are more styles of clothes than Sanya, and the price is relatively cheap.
I hope you have a good time in Sanya!
Go out, safety first!