Climate almanac
Alliston
Ontario, Canada · 44.15°, -79.87°
What is the weather like in Alliston in September?
In September, Alliston is typically 72°F (22°C) during the day and 53°F (12°C) at night. The month brings about 2.4 in (62 mm) of precipitation in total.
- Average high72°F (22°C)
- Average low53°F (12°C)
- Precipitation2.4 in (62 mm)
- Clear or mostly clear days11
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)