Chesterfield Weather Forecast

    • 62
    • 75

    Chance Rain Showers

    • 56
    • 74

    Mostly Cloudy

    • 56
    • 75

    Partly Sunny

    • 57
    • 75

    Mostly Cloudy

    • 58
    • 77

    Mostly Cloudy

    • 58
    • 76

    Mostly Cloudy

Today 21 Sep St. Louis

Patchy fog this morning. Cloudy with a slight chance of Thunderstorms. A chance of Showers, mainly this morning. Much cooler with Highs in the mid 70s. Northeast Winds 5 to 10 Mph. Chance of rain 40 percent.

Tonight 21 Sep St. Louis

Mostly cloudy. Lows in the lower 60s. Northeast Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Chesterfield Temperature Statistics

September Temperature

St. Louis, Spirit Of St. Louis Airport (3.7 miles)

  • Lowest 8 September, 2026

    59.6 °F

  • Average September

    81.7 °F

  • Highest 5 September, 2026

    102.7 °F

Climate (2021–2026)

St. Louis, Spirit Of St. Louis Airport (3.7 miles)

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  • Average Low 2021–2026

    46.2 °F

  • Average 2021–2026

    57.6 °F

  • Average High 2021–2026

    69 °F
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