November in Sarnia averages a daily high of 8.8°C with nights around 1.5°C. Expect roughly 11.1 wet days totalling 67.3mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Sarnia is May–September.
Based on PORT HURON, MI US (1.3km), 1995–2024. 30 years of November data.