In September, the weather in Rostov-na-Donu is typically warm. Average daily high temperature in September is about 22 degrees above zero. On average, Rostov-na-Donu has 16 sunny, 11 partly cloudy, and 3 rainy days in September. The rains are usually light. September as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Rostov-na-Donu.