In September, the weather in Kalach-na-Donu is typically warm. Average daily high temperature in September is about 20 degrees above zero. On average, Kalach-na-Donu has 18 sunny, 9 partly cloudy, and 3 rainy days in September. The rains are usually moderate. September as well as June and August is considered the most comfortable time to visit Kalach-na-Donu.