May in Windsor averages a daily high of 21.6°C with nights around 10.2°C. Expect roughly 12.8 wet days totalling 91.6mm. Generally workable, with some weather to plan around.
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 May data.