The weather in Sanya during the National Day

If it rains, of course, you can't go swimming in the sea. The rain in the next few days is caused by typhoons. At that time, the waves will be very big, and if you get into the water, you will be in danger of being swept away.

According to the current weather forecast, the typhoon may pass through Sanya on the 30th to 1 1, but it will usually clear up the day after the typhoon passes, so you should be able to go into the water after the 2nd.