In September, the weather in Nizhneudinsk is typically warm. Average daily high temperature in September is about 13 degrees above zero. On average, Nizhneudinsk has 13 rainy, 8 partly cloudy, 6 sunny, and 3 cloudy days in September. The rains are usually heavy. September as well as January, February, October, and December is considered the most uncomfortable time to visit Nizhneudinsk.