May in Dagupan is the hottest month of the year. In May, the weather in Dagupan is typically hot. Average daily high temperature in May is about 30 degrees above zero. On average, Dagupan has 19 rainy, 7 sunny, and 5 partly cloudy days in May. The rains are usually heavy. May as well as June, July, August, and September is considered the most uncomfortable time to visit Dagupan.