March in Nanaimo is the rainiest month of the year. In March, the weather in Nanaimo is typically cold. Average daily high temperature in March is about 7 degrees above zero. On average, Nanaimo has 27 rainy, 2 sunny, and 2 cloudy days in March. The rains are usually heavy. March as well as January, February, April, and October is considered the most uncomfortable time to visit Nanaimo.