Black Walnut Weather Forecast

    • 71
    • 90

    Decreasing Clouds

    • 75
    • 97

    Hot

    • 79
    • 100

    Hot

    • 79
    • 100

    Hot

    • 79
    • 100

    Hot

    • 77
    • 98

    Hot

Today 29 Aug St. Charles

Mostly sunny. Near steady temperature in the upper 80s. South Winds 5 to 10 Mph.

Tonight 29 Aug St. Charles

Partly cloudy in the Evening, then becoming mostly clear. Lows in the upper 60s. South Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Black Walnut Temperature Statistics

August Temperature

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

  • Lowest 24 August, 2026

    54.6 °F

  • Average August

    77.7 °F

  • Highest 13 August, 2026

    97.6 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    47.3 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    68.9 °F
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