August in Voronezh is the sunniest month of the year. In August, the weather in Voronezh is typically warm. Average daily high temperature in August is about 26 degrees above zero. On average, Voronezh has 17 sunny, 9 partly cloudy, 4 rainy, and 1 cloudy day in August. The rains are usually light. August as well as July and September is considered the most comfortable time to visit Voronezh.