July in Rayakoski is the warmest month of the year. In July, the weather in Rayakoski is typically warm. Average daily high temperature in July is about 15 degrees above zero. On average, Rayakoski has 19 rainy, 8 cloudy, 3 sunny, and 1 partly cloudy day in July. The rains are usually moderate. July as well as January, April, May, and June is considered the most uncomfortable time to visit Rayakoski.