September in Brossard averages a daily high of 21.9°C with nights around 10.3°C. Expect roughly 9.4 wet days totalling 77.1mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Brossard is May–September.
Based on LAPRAIRIE, QC CA (7.8km), 1995–2024. 14 years of September data.