August in Gatineau averages a daily high of 25.4°C with nights around 13.9°C. Expect roughly 9.2 wet days totalling 86.2mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Gatineau is May–September.
Based on CHELSEA, QC CA (7.7km), 1995–2024. 17 years of August data.