Visiting local bars in Dien Bien Phu is better when you know what the weather holds. These rainfall averages and temperatures can help you decide the best time for bar-hopping. The hottest months are usually April and May, with an average temperature of 25°C, while the coldest months are January and December, with an average of 18°C. The rainiest months in Dien Bien Phu are August, July, June and May, with each month seeing an average of 371 mm of rainfall.