Climate almanac
Marion
Illinois, United States · 37.73°, -88.93°
What is the weather like in Marion in September?
In September, Marion is typically 83°F (29°C) during the day and 63°F (17°C) at night. The month brings about 2.8 in (70 mm) of precipitation in total.
- Average high83°F (29°C)
- Average low63°F (17°C)
- Precipitation2.8 in (70 mm)
- Clear or mostly clear days15
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)