June in Cao Bằng is the cloudiest month of the year. In June, the weather in Cao Bằng is typically hot. Average daily high temperature in June is about 28 degrees above zero. On average, Cao Bằng has 29 rainy and 1 sunny day in June. The rains are usually heavy. June as well as May, July, August, and September is considered the most uncomfortable time to visit Cao Bằng.