Wentzville Weather Forecast

    • 64
    • 84

    Increasing Clouds

    • 70
    • 88

    Thunderstorms Likely

    • 66
    • 85

    Chance Thunderstorms

    • 64
    • 82

    Slight Chance Thunderstorms

    • 64
    • 83

    Slight Chance Thunderstorms

    • 64
    • 85

    Mostly Sunny

Today 17 Aug St. Charles

Mostly sunny. Highs in the mid 80s. North Winds 5 to 10 Mph.

Tonight 17 Aug St. Charles

Partly cloudy. Patchy fog after midnight. Lows in the mid 60s. North Winds 5 to 10 Mph.

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Wentzville Temperature Statistics

August Temperature

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

  • Lowest 3 August, 2026

    62.7 °F

  • Average August

    79.5 °F

  • Highest 11 August, 2026

    95.6 °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

    68.9 °F
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