April in Sumy is the rainiest month of the year. In April, the weather in Sumy is typically warm. Average daily high temperature in April is about 11 degrees above zero. On average, Sumy has 13 rainy, 6 sunny, 6 cloudy, and 5 partly cloudy days in April. The rains are usually moderate. April as well as January, March, October, and November is considered the most uncomfortable time to visit Sumy.