Climate almanac
St. Thomas
Ontario, Canada · 42.77°, -81.18°
What is the weather like in St. Thomas in September?
In September, St. Thomas is typically 71°F (22°C) during the day and 60°F (15°C) at night. The month brings about 2.6 in (67 mm) of precipitation in total.
- Average high71°F (22°C)
- Average low60°F (15°C)
- Precipitation2.6 in (67 mm)
- Clear or mostly clear days12
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)