In April, the weather in Rayakoski is typically freezing. Average daily high temperature in April is about zero. On average, Rayakoski has 16 cloudy, 10 rainy, 2 sunny, 1 snowy, and 1 partly cloudy day in April. The rains are usually light. April as well as January, May, June, and July is considered the most uncomfortable time to visit Rayakoski.