Climate almanac
Sarnia
Ontario, Canada · 42.98°, -82.40°
What is the weather like in Sarnia in September?
In September, Sarnia is typically 73°F (23°C) during the day and 59°F (15°C) at night. The month brings about 2.6 in (65 mm) of precipitation in total.
- Average high73°F (23°C)
- Average low59°F (15°C)
- Precipitation2.6 in (65 mm)
- Clear or mostly clear days12
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)