Chesterfield Weather Forecast

    • 73
    • 90

    Becoming Sunny

    • 73
    • 99

    Chance Thunderstorms

    • 74
    • 97

    Slight Chance Thunderstorms

    • 72
    • 95

    Slight Chance Thunderstorms

    • 70
    • 92

    Slight Chance Thunderstorms

    • 67
    • 89

    Chance Rain Showers

Today 14 Sep St. Louis

Mostly sunny. Highs in the upper 80s. East Winds 10 to 15 Mph.

Tonight 14 Sep St. Louis

Mostly cloudy. Near steady temperature in the mid 60s. Northeast Winds 5 to 10 Mph with Gusts up to 20 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

    81.9 °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

    46.1 °F

  • Average 2021–2026

    57.5 °F

  • Average High 2021–2026

    69 °F
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