Climate almanac
Lewistown
Montana, United States · 47.06°, -109.43°
What is the weather like in Lewistown in September?
In September, Lewistown is typically 72°F (22°C) during the day and 48°F (9°C) at night. The month brings about 2.2 in (56 mm) of precipitation in total. Snowfall averages about 1.2 in (30 mm) over the month.
- Average high72°F (22°C)
- Average low48°F (9°C)
- Precipitation2.2 in (56 mm)
- Clear or mostly clear days15
- Snowfall1.2 in (30 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)