Wentzville Weather Forecast

    • 61
    • 92

    Mostly Sunny

    • 65
    • 93

    Partly Sunny

    • 63
    • 87

    Chance Thunderstorms

    • 64
    • 87

    Chance Thunderstorms

    • 65
    • 85

    Chance Thunderstorms

    • 63
    • 85

    Chance Rain Showers

Today 17 Sep St. Charles

Sunny. Highs in the lower 90s. Northeast Winds around 5 Mph.

Tonight 17 Sep St. Charles

Clear. Lows in the lower 60s. East Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Wentzville Temperature Statistics

September Temperature

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

  • Lowest 8 September, 2025

    41 °F

  • Average September

    69.9 °F

  • Highest 14 September, 2025

    98.1 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    45.8 °F

  • Average 2020–2025

    56.9 °F

  • Average High 2020–2025

    68.1 °F
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