Climate almanac
Lemont
Illinois, United States · 41.67°, -88.00°
What is the weather like in Lemont in September?
In September, Lemont is typically 77°F (25°C) during the day and 59°F (15°C) at night. The month brings about 3.0 in (76 mm) of precipitation in total.
- Average high77°F (25°C)
- Average low59°F (15°C)
- Precipitation3.0 in (76 mm)
- Clear or mostly clear days13
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)