October in Barrie averages a daily high of 13.8°C with nights around 5.3°C. Expect roughly 15.3 wet days totalling 86.2mm. Demanding conditions — pack for it and plan indoor options.
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 October data.