Wentzville Weather Forecast

    • 75
    • 98

    Hot

    • 77
    • 99

    Hot

    • 78
    • 98

    Hot

    • 75
    • 98

    Hot

    • 73
    • 93

    Partly Sunny

    • 71
    • 92

    Mostly Sunny

Today 31 Aug St. Charles

Sunny, hot with Highs in the upper 90s. Southwest Winds 5 to 10 Mph.

Tonight 31 Aug St. Charles

Clear. Lows in the mid 70s. South Winds 5 to 10 Mph. Heat index Values up to 101 early in the evening.

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Wentzville Temperature Statistics

August Temperature

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

  • Lowest 24 August, 2026

    57 °F

  • Average August

    77.9 °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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