August in Sumy is the sunniest month of the year. In August, the weather in Sumy is typically warm. Average daily high temperature in August is about 25 degrees above zero. On average, Sumy has 21 sunny, 6 partly cloudy, 3 rainy, and 1 cloudy day in August. The rains are usually light. August as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Sumy.