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 15 sunny, 7 rainy, 6 partly cloudy, and 3 cloudy days in August. The rains are usually moderate. August as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Sumy.