Wentzville Weather Forecast

    • 76
    • 94

    Becoming Sunny

    • 68
    • 95

    Slight Chance Thunderstorms

    • 63
    • 84

    Partly Sunny

    • 64
    • 83

    Mostly Cloudy

    • 66
    • 83

    Chance Thunderstorms

    • 69
    • 88

    Partly Sunny

Today 20 Jul St. Charles

Patchy fog and smoke in the morning. Mostly sunny. Humid with Highs in the lower 90s. Southeast Winds around 5 Mph, becoming south in the afternoon. Heat index Values up to 105.

Tonight 20 Jul St. Charles

Partly cloudy. Patchy fog and smoke. Near steady temperature in the lower 70s. East Winds around 5 Mph.

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Wentzville Temperature Statistics

July Temperature

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

  • Lowest 13 July, 2026

    64.7 °F

  • Average July

    80.3 °F

  • Highest 2 July, 2026

    96.7 °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

    68.9 °F
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