Chesterfield Weather Forecast

    • 55
    • 77

    Becoming Sunny

    • 63
    • 82

    Mostly Sunny

    • 70
    • 88

    Mostly Cloudy

    • 63
    • 81

    Rain Showers Likely

    • 59
    • 71

    Chance Rain Showers

    • 60
    • 72

    Slight Chance Thunderstorms

Today 28 Sep St. Louis

Sunny. Highs in the upper 70s. Northeast Winds around 5 Mph.

Tonight 28 Sep St. Louis

Clear. Lows in the lower 50s. East Winds around 5 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 25 September, 2026

    54 °F

  • Average September

    78.5 °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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