April in Phayao is the hottest month of the year. In April, the weather in Phayao is typically hot. Average daily high temperature in April is about 32 degrees above zero. On average, Phayao has 14 rainy, 8 cloudy, 5 partly cloudy, and 3 sunny days in April. The rains are usually heavy. April as well as May, June, July, and August is considered the most uncomfortable time to visit Phayao.