In June, the weather in Kostomucsha is typically warm. Average daily high temperature in June is about 15 degrees above zero. On average, Kostomucsha has 17 rainy, 7 cloudy, 4 sunny, and 2 partly cloudy days in June. The rains are usually moderate. June as well as January, April, May, and August is considered the most uncomfortable time to visit Kostomucsha.