May in Barrie averages a daily high of 18.7°C with nights around 6.7°C. Expect roughly 10.8 wet days totalling 74mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Barrie is May–September.
Based on SHANTY BAY, ON CA (2.6km), 1995–2024. 29 years of May data.