Climate almanac
St. Louis
Missouri, United States · 38.63°, -90.20°
What is the weather like in St. Louis in September?
In September, St. Louis is typically 83°F (28°C) during the day and 62°F (16°C) at night. The month brings about 3.0 in (77 mm) of precipitation in total.
- Average high83°F (28°C)
- Average low62°F (16°C)
- Precipitation3.0 in (77 mm)
- Clear or mostly clear days15
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)