Climate almanac
Rapid City
South Dakota, United States · 44.08°, -103.23°
What is the weather like in Rapid City in September?
In September, Rapid City is typically 77°F (25°C) during the day and 51°F (11°C) at night. The month brings about 1.5 in (39 mm) of precipitation in total. Snowfall averages about 0.2 in (6 mm) over the month.
- Average high77°F (25°C)
- Average low51°F (11°C)
- Precipitation1.5 in (39 mm)
- Clear or mostly clear days17
- Snowfall0.2 in (6 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)