Wentzville Weather Forecast

    • 75
    • 94

    Mostly Sunny

    • 75
    • 97

    Mostly Sunny

    • 75
    • 97

    Mostly Sunny

    • 75
    • 97

    Hot

    • 71
    • 95

    Chance Thunderstorms

    • 67
    • 87

    Slight Chance Thunderstorms

Today 15 Aug St. Charles

Sunny. Highs in the mid 90s. South Winds around 5 Mph. Heat index Values up to 102.

Tonight 15 Aug St. Charles

Mostly clear. Near steady temperature in the lower 70s. Southeast Winds around 5 Mph.

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Wentzville Temperature Statistics

August Temperature

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

  • Lowest 3 August, 2025

    55.7 °F
  • Average August

    76.7 °F
  • Highest 8 August, 2025

    94.6 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    45.9 °F
  • Average 2020–2025

    56.9 °F
  • Average High 2020–2025

    68.1 °F
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