September in Pierrefonds-Roxboro averages a daily high of 21.7°C with nights around 11.7°C. Expect roughly 10.3 wet days totalling 68.2mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Pierrefonds-Roxboro is May–September.
Based on MONTREAL PIERRE ELLIOTT TRUDEA, QC CA (8.2km), 1995–2024. 18 years of September data.