Black Walnut Weather Forecast

    • 18
    • 39

    Becoming Sunny

    • 28
    • 35

    Chance Snow

    • 19
    • 44

    Mostly Cloudy

    • 9
    • 27

    Partly Sunny

    • 15
    • 26

    Partly Sunny

    • 12
    • 31

    Mostly Sunny

Today 14 Jan St. Charles

Partly sunny. Much cooler with Highs in the upper 30s. Temperature falling into the lower 30s this afternoon. Northwest Winds 15 to 20 Mph with Gusts up to 35 Mph.

Tonight 14 Jan St. Charles

Clear. Much cooler with Lows around 18. Northwest Winds 10 to 15 Mph. Gusts up to 30 Mph in the evening.

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  • Temperature Real-Time

Black Walnut Temperature Statistics

January Temperature

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

  • Lowest 12 January, 2026

    23 °F

  • Average January

    45.1 °F

  • Highest 6 January, 2026

    66 °F

Climate (2021–Present)

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

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  • Average Low 2021–2026

    47.5 °F

  • Average 2021–2026

    57.9 °F

  • Average High 2021–2026

    68.6 °F
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