May in Coquitlam averages a daily high of 17.5°C with nights around 8.6°C. Expect roughly 10.6 wet days totalling 89.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Coquitlam is July–August.
Based on PORT MOODY GLENAYRE, BC CA (7.3km), 1995–2024. 19 years of May data.