July in Cao Bằng is the rainiest month of the year. In July, the weather in Cao Bằng is typically hot. Average daily high temperature in July is about 28 degrees above zero. On average, Cao Bằng has 30 rainy and 1 sunny day in July. The rains are usually heavy. July as well as May, June, August, and September is considered the most uncomfortable time to visit Cao Bằng.