March in Port Coquitlam is the rainiest and the cloudiest month of the year. In March, the weather in Port Coquitlam is typically cold. Average daily high temperature in March is about 8 degrees above zero. On average, Port Coquitlam has 27 rainy, 3 sunny, and 1 partly cloudy day in March. The rains are usually heavy. March as well as January, February, April, and October is considered the most uncomfortable time to visit Port Coquitlam.