Climate almanac
Decorah
Iowa, United States · 43.30°, -91.79°
What is the weather like in Decorah in September?
In September, Decorah is typically 75°F (24°C) during the day and 56°F (13°C) at night. The month brings about 3.8 in (97 mm) of precipitation in total.
- Average high75°F (24°C)
- Average low56°F (13°C)
- Precipitation3.8 in (97 mm)
- Clear or mostly clear days14
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)