In March, the weather in Cao Bằng is typically warm. Average daily high temperature in March is about 21 degrees above zero. On average, Cao Bằng has 19 rainy, 5 cloudy, 4 partly cloudy, and 3 sunny days in March. The rains are usually heavy. March as well as January, April, May, and June is considered the most uncomfortable time to visit Cao Bằng.