Chesterfield Weather Forecast
- 65
- 94
Decreasing Clouds
- 66
- 94
Mostly Sunny
- 66
- 93
Mostly Sunny
- 66
- 94
Chance Thunderstorms
- 64
- 86
Chance Thunderstorms
- 63
- 83
Chance Rain Showers
Today 15 Sep St. Louis
Sunny. Highs in the lower 90s. East Winds 5 to 10 Mph.
Tonight 15 Sep St. Louis
Mostly clear. Lows in the upper 60s. East Winds around 5 Mph.
Chesterfield Temperature Statistics
September Temperature
St. Louis, Spirit Of St. Louis Airport (3.7 miles)
Lowest 8 September, 2025
41 °FAverage September
68.4 °FHighest 13 September, 2025
97 °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