May in Vũng Tàu is the hottest month of the year. In May, the weather in Vũng Tàu is typically hot. Average daily high temperature in May is about 30 degrees above zero. On average, Vũng Tàu has 26 rainy, 4 sunny, and 1 cloudy day in May. The rains are usually heavy. May as well as June, July, August, and September is considered the most uncomfortable time to visit Vũng Tàu.