Climate almanac
Harlan
Iowa, United States · 41.65°, -95.33°
What is the weather like in Harlan in September?
In September, Harlan is typically 79°F (26°C) during the day and 58°F (15°C) at night. The month brings about 3.0 in (76 mm) of precipitation in total.
- Average high79°F (26°C)
- Average low58°F (15°C)
- Precipitation3.0 in (76 mm)
- Clear or mostly clear days16
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)