January in Nanaimo is the cloudiest month of the year. In January, the weather in Nanaimo is typically cold. Average daily high temperature in January is about 5 degrees above zero. On average, Nanaimo has 18 rainy, 6 cloudy, 4 partly cloudy, and 3 sunny days in January. The rains are usually heavy. January as well as February, March, April, and October is considered the most uncomfortable time to visit Nanaimo.