January in Kennewick is the snowiest and the cloudiest month of the year. In January, the weather in Kennewick is typically cold. Average daily high temperature in January is about 5 degrees above zero. On average, Kennewick has 11 partly cloudy, 9 cloudy, 5 rainy, 5 sunny, and 1 snowy day in January. The rains are usually light. January as well as February, November, and December is considered the most uncomfortable time to visit Kennewick.