May in Yanchukan is the rainiest month of the year. In May, the weather in Yanchukan is typically cold. Average daily high temperature in May is about 6 degrees above zero. On average, Yanchukan has 14 rainy, 7 partly cloudy, 6 sunny, and 4 cloudy days in May. The rains are usually moderate. May as well as January, February, March, and September is considered the most uncomfortable time to visit Yanchukan.