July in Wonsan is the rainiest, the cloudiest, and the warmest month of the year. In July, the weather in Wonsan is typically warm. Average daily high temperature in July is about 25 degrees above zero. On average, Wonsan has 15 rainy, 8 sunny, 5 partly cloudy, and 3 cloudy days in July. The rains are usually heavy. July as well as February, March, and November is considered the most uncomfortable time to visit Wonsan.