January in Coquitlam is the windiest month of the year. In January, the weather in Coquitlam is typically cold. Average daily high temperature in January is about 2 degrees above zero. On average, Coquitlam 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 Coquitlam.