September in Omsukchan is the rainiest month of the year. In September, the weather in Omsukchan is typically cold. Average daily high temperature in September is about 4 degrees above zero. On average, Omsukchan has 17 rainy, 6 cloudy, 4 sunny, 2 snowy, and 1 partly cloudy day in September. The rains are usually light. September as well as January, February, March, and November is considered the most uncomfortable time to visit Omsukchan.