August in Kalach-na-Donu is the sunniest month of the year. In August, the weather in Kalach-na-Donu is typically hot. Average daily high temperature in August is about 29 degrees above zero. On average, Kalach-na-Donu has 18 sunny, 7 partly cloudy, 4 rainy, and 2 cloudy days in August. The rains are usually light. August as well as September is considered the most comfortable time to visit Kalach-na-Donu.