April in Iisalmi is the rainiest month of the year. In April, the weather in Iisalmi is typically cold. Average daily high temperature in April is about 4 degrees above zero. On average, Iisalmi has 16 rainy, 12 cloudy, and 2 sunny days in April. The rains are usually light. April as well as September, October, and November is considered the most uncomfortable time to visit Iisalmi.