September in Semiletka is the rainiest month of the year. In September, the weather in Semiletka is typically warm. Average daily high temperature in September is about 15 degrees above zero. On average, Semiletka has 14 rainy, 6 cloudy, 5 sunny, and 5 partly cloudy days in September. The rains are usually moderate. September as well as January, February, April, and October is considered the most uncomfortable time to visit Semiletka.