July in Hyesan is the rainiest, the cloudiest, and the warmest month of the year. In July, the weather in Hyesan is typically warm. Average daily high temperature in July is about 24 degrees above zero. On average, Hyesan has 20 rainy, 7 partly cloudy, 3 sunny, and 1 cloudy day in July. The rains are usually heavy. July as well as January, March, April, and May is considered the most uncomfortable time to visit Hyesan.