June in Dien Bien Phu is the cloudiest month of the year. In June, the weather in Dien Bien Phu is typically warm. Average daily high temperature in June is about 26 degrees above zero. On average, Dien Bien Phu has 30 rainy days in June. The rains are usually heavy. June as well as April, May, July, and August is considered the most uncomfortable time to visit Dien Bien Phu.