Climate almanac
Sioux City
Iowa, United States · 42.50°, -96.40°
What is the weather like in Sioux City in September?
In September, Sioux City is typically 80°F (27°C) during the day and 58°F (15°C) at night. The month brings about 2.7 in (69 mm) of precipitation in total.
- Average high80°F (27°C)
- Average low58°F (15°C)
- Precipitation2.7 in (69 mm)
- Clear or mostly clear days17
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)