September in Kemi is the rainiest month of the year. In September, the weather in Kemi is typically warm. Average daily high temperature in September is about 12 degrees above zero. On average, Kemi has 14 rainy, 6 sunny, 6 cloudy, and 4 partly cloudy days in September. The rains are usually moderate. September as well as April, May, October, and November is considered the most uncomfortable time to visit Kemi.