May in Dumaguete is the hottest month of the year. In May, the weather in Dumaguete is typically hot. Average daily high temperature in May is about 29 degrees above zero. On average, Dumaguete has 26 rainy, 4 sunny, and 1 partly cloudy day in May. The rains are usually heavy. May as well as January, March, April, and June is considered the most uncomfortable time to visit Dumaguete.