May in Isit is the rainiest and the windiest month of the year. In May, the weather in Isit is typically cold. Average daily high temperature in May is about 9 degrees above zero. On average, Isit has 14 rainy, 8 cloudy, 5 partly cloudy, and 4 sunny 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 Isit.