Black Walnut Weather Forecast

    • 52
    • 75

    Sunny

    • 60
    • 81

    Partly Sunny

    • 59
    • 81

    Partly Sunny

    • 58
    • 80

    Partly Sunny

    • 60
    • 79

    Partly Sunny

    • 59
    • 80

    Partly Sunny

Today 26 Aug St. Charles

Sunny. Highs in the mid 70s. Northwest Winds 5 to 10 Mph.

Tonight 26 Aug St. Charles

Clear. Lows in the lower 50s. Northeast Winds around 5 Mph.

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Black Walnut Temperature Statistics

August Temperature

St. Charles, St. Charles County Smartt Airport (5 miles)

  • Lowest 3 August, 2025

    58.6 °F

  • Average August

    78.7 °F

  • Highest 18 August, 2025

    98.7 °F

Climate (2020–Present)

St. Charles, St. Charles County Smartt Airport (5 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    57.7 °F

  • Average High 2020–2025

    68.4 °F
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