August in Québec averages a daily high of 24.7°C with nights around 14.9°C. Expect roughly 13.2 wet days totalling 115.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Québec is June–September.
Based on BEAUPORT, QC CA (2.6km), 1995–2024. 15 years of August data.