In April, the weather in Kostomucsha is typically cold. Average daily high temperature in April is about 2 degrees above zero. On average, Kostomucsha has 15 rainy, 11 cloudy, 3 snowy, and 1 sunny day in April. The rains are usually moderate. April as well as January, May, June, and August is considered the most uncomfortable time to visit Kostomucsha.