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 27 sunny, 3 partly cloudy, and 1 rainy day in August. August as well as June and September is considered the most comfortable time to visit Kalach-na-Donu.