January in Prince Rupert is the rainiest and the cloudiest month of the year. In January, the weather in Prince Rupert is typically cold. Average daily high temperature in January is about 3 degrees above zero. On average, Prince Rupert has 27 rainy, 3 sunny, and 1 cloudy day in January. The rains are usually heavy. January as well as February, March, April, and May is considered the most uncomfortable time to visit Prince Rupert.