Black Walnut Weather Forecast

    • 64
    • 84

    Chance Rain Showers

    • 64
    • 82

    Rain Showers Likely

    • 63
    • 86

    Chance Rain Showers

    • 60
    • 84

    Mostly Sunny

    • 61
    • 83

    Mostly Sunny

    • 66
    • 86

    Partly Sunny

Today 30 May St. Charles

Mostly cloudy with a slight chance of Showers and Thunderstorms this Morning, then partly sunny with a chance of Showers and Thunderstorms this afternoon. Highs in the lower 80s. East Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 30 May St. Charles

Partly cloudy in the Evening, then becoming mostly cloudy. A slight chance of Showers and Thunderstorms. Lows in the lower 60s. East Winds 5 to 10 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Black Walnut Temperature Statistics

May Temperature

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

  • Lowest 3 May, 2026

    40.6 °F

  • Average May

    65.5 °F

  • Highest 17 May, 2026

    88.6 °F

Climate (2021–Present)

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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