Climate almanac
St. Marys
Ontario, Canada · 43.25°, -81.13°
What is the weather like in St. Marys in September?
In September, St. Marys is typically 72°F (22°C) during the day and 54°F (12°C) at night. The month brings about 2.9 in (74 mm) of precipitation in total.
- Average high72°F (22°C)
- Average low54°F (12°C)
- Precipitation2.9 in (74 mm)
- Clear or mostly clear days12
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)