January in Courtenay is the cloudiest month of the year. In January, the weather in Courtenay is typically cold. Average daily high temperature in January is about 5 degrees above zero. On average, Courtenay has 19 rainy, 7 partly cloudy, and 5 cloudy 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 Courtenay.