September in Windsor averages a daily high of 24.3°C with nights around 14.1°C. Expect roughly 9.3 wet days totalling 91.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Windsor is May–June.
Based on WINDSOR RIVERSIDE, ON CA (7.8km), 1995–2024. 29 years of September data.