I especially want to ask about the weather in Sanya from May to June.

From May to June, Hainan just entered the summer, and the weather temperature gradually increased, with the temperature between 28-38℃. Noon is the hottest time, the temperature can reach 38℃, and it is easy to get heatstroke. Don't forget to bring water when you go out. If you are afraid of the dark, you can apply sunscreen products. Girls can also bring umbrellas. There is little long rain, and the longest time is typhoon weather, which usually falls to 2. These are only personal information, because the weather is not fixed every year.