In April, the weather in Koskosalma is typically cold. Average daily high temperature in April is about 5 degrees above zero. On average, Koskosalma has 11 partly cloudy, 7 sunny, 6 cloudy, 5 rainy, and 1 snowy day in April. The rains are usually light. April as well as January, May, September, and October is considered the most uncomfortable time to visit Koskosalma.