August in Barrie averages a daily high of 25.3°C with nights around 14.4°C. Expect roughly 10.6 wet days totalling 86.7mm. Comfortable conditions for being outdoors all day.
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 August data.