Climate almanac
Denison
Iowa, United States · 42.02°, -95.36°
What is the weather like in Denison in September?
In September, Denison is typically 79°F (26°C) during the day and 58°F (14°C) at night. The month brings about 3.1 in (79 mm) of precipitation in total.
- Average high79°F (26°C)
- Average low58°F (14°C)
- Precipitation3.1 in (79 mm)
- Clear or mostly clear days16
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)