September in Québec averages a daily high of 20.1°C with nights around 10.4°C. Expect roughly 11.4 wet days totalling 106.2mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Québec is June–September.
Based on BEAUPORT, QC CA (2.6km), 1995–2024. 14 years of September data.