In September, the weather in Debin is typically cold. Average daily high temperature in September is about 6 degrees above zero. On average, Debin has 10 cloudy, 8 rainy, 6 sunny, 4 partly cloudy, and 2 snowy days in September. The rains are usually light. September as well as January, February, March, and November is considered the most uncomfortable time to visit Debin.