Climate almanac
Quincy
Illinois, United States · 39.94°, -91.41°
What is the weather like in Quincy in September?
In September, Quincy is typically 81°F (27°C) during the day and 61°F (16°C) at night. The month brings about 2.7 in (70 mm) of precipitation in total.
- Average high81°F (27°C)
- Average low61°F (16°C)
- Precipitation2.7 in (70 mm)
- Clear or mostly clear days16
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)