May in Côn Đảo is the hottest month of the year. In May, the weather in Côn Đảo is typically hot. Average daily high temperature in May is about 29 degrees above zero. On average, Côn Đảo has 17 rainy, 8 sunny, 3 cloudy, and 3 partly cloudy days in May. The rains are usually moderate. May as well as June, July, August, and September is considered the most uncomfortable time to visit Côn Đảo.