April in Dien Bien Phu is the hottest month of the year. In April, the weather in Dien Bien Phu is typically hot. Average daily high temperature in April is about 28 degrees above zero. On average, Dien Bien Phu has 18 rainy, 6 partly cloudy, 5 sunny, and 1 cloudy day in April. The rains are usually heavy. April as well as May, June, July, and August is considered the most uncomfortable time to visit Dien Bien Phu.