June in Sanya is the cloudiest and the hottest month of the year. In June, the weather in Sanya is typically hot. Average daily high temperature in June is about 30 degrees above zero. On average, Sanya has 25 rainy, 3 cloudy, and 2 sunny days in June. The rains are usually heavy. June as well as May, July, August, and September is considered the most uncomfortable time to visit Sanya.