Wentzville Weather Forecast

    • 73
    • 87

    Becoming Sunny

    • 71
    • 97

    Chance Thunderstorms

    • 74
    • 94

    Chance Rain Showers

    • 72
    • 93

    Slight Chance Thunderstorms

    • 70
    • 91

    Slight Chance Thunderstorms

    • 67
    • 90

    Chance Rain Showers

Today 14 Sep St. Charles

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

Tonight 14 Sep St. Charles

Mostly clear. Lows in the lower 70s. Southeast Winds 10 to 15 Mph.

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Wentzville Temperature Statistics

September Temperature

St. Louis, Spirit Of St. Louis Airport (14.9 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 (14.9 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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