Chesterfield Weather Forecast
- 52
- 75
Chance Rain Showers
- 50
- 78
Mostly Sunny
- 50
- 77
Sunny
- 55
- 80
Mostly Sunny
- 60
- 84
Mostly Sunny
- 63
- 90
Mostly Sunny
Today 5 Sep St. Louis
Mostly sunny this Morning, then mostly cloudy with a chance of Showers this afternoon. Highs in the mid 70s. Temperature falling into the lower 70s this afternoon. Northwest Winds 5 to 10 Mph. Chance of rain 50 percent.
Tonight 5 Sep St. Louis
Mostly cloudy with a 50 percent chance of Showers. Lows in the lower 50s. West Winds 5 to 10 Mph.
Chesterfield Temperature Statistics
September Temperature
St. Louis, Spirit Of St. Louis Airport (3.7 miles)
Lowest 1 September, 2025
57 °FAverage September
68.8 °FHighest 1 September, 2025
81 °F
Climate (2020–Present)
St. Louis, Spirit Of St. Louis Airport (3.7 miles)
Average Low 2020–2025
45.8 °FAverage 2020–2025
56.9 °FAverage High 2020–2025
68.1 °F