January in Roseville is the rainiest and the cloudiest month of the year. In January, the weather in Roseville is typically warm. Average daily high temperature in January is about 15 degrees above zero. On average, Roseville has 11 rainy, 9 sunny, 6 partly cloudy, and 5 cloudy days in January. The rains are usually heavy. January as well as December is considered the most uncomfortable time to visit Roseville.