April in Kostiantynivka is the rainiest month of the year. In April, the weather in Kostiantynivka is typically warm. Average daily high temperature in April is about 15 degrees above zero. On average, Kostiantynivka has 11 rainy, 8 sunny, 6 partly cloudy, and 5 cloudy days in April. The rains are usually moderate. April as well as January, February, March, and November is considered the most uncomfortable time to visit Kostiantynivka.