January in Cao Bằng is the coldest month of the year. In January, the weather in Cao Bằng is typically warm. Average daily high temperature in January is about 15 degrees above zero. On average, Cao Bằng has 15 rainy, 6 cloudy, 5 sunny, and 5 partly cloudy days in January. The rains are usually moderate. January as well as March, April, May, and June is considered the most uncomfortable time to visit Cao Bằng.