Climate almanac
Helena
Montana, United States · 46.59°, -112.04°
What is the weather like in Helena in September?
In September, Helena is typically 71°F (22°C) during the day and 45°F (7°C) at night. The month brings about 1.9 in (49 mm) of precipitation in total. Snowfall averages about 1.7 in (42 mm) over the month.
- Average high71°F (22°C)
- Average low45°F (7°C)
- Precipitation1.9 in (49 mm)
- Clear or mostly clear days14
- Snowfall1.7 in (42 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)