Climate almanac
Great Falls
Montana, United States · 47.50°, -111.30°
What is the weather like in Great Falls in September?
In September, Great Falls is typically 76°F (24°C) during the day and 50°F (10°C) at night. The month brings about 1.6 in (41 mm) of precipitation in total. Snowfall averages about 0.7 in (19 mm) over the month.
- Average high76°F (24°C)
- Average low50°F (10°C)
- Precipitation1.6 in (41 mm)
- Clear or mostly clear days15
- Snowfall0.7 in (19 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)