Byrnes Mill Weather Forecast

    • 58
    • 72

    Decreasing Clouds

    • 46
    • 72

    Partly Sunny

    • 58
    • 71

    Mostly Cloudy

    • 19
    • 68

    Rain Likely

    • 17
    • 29

    Mostly Sunny

    • 24
    • 37

    Mostly Sunny

Today 25 Dec Jefferson

Mostly cloudy. Patchy dense fog. Highs in the lower 70s. West Winds around 5 Mph, becoming southeast around 5 Mph this afternoon.

Tonight 25 Dec Jefferson

Mostly cloudy. Lows in the upper 50s. South Winds 5 to 10 Mph with Gusts up to 20 Mph.

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Byrnes Mill Temperature Statistics

December Temperature

St. Louis, Spirit Of St. Louis Airport (15.5 miles)

  • Lowest 14 December, 2025

    7 °F

  • Average December

    34.6 °F

  • Highest 23 December, 2025

    68 °F

Climate (2020–Present)

St. Louis, Spirit Of St. Louis Airport (15.5 miles)

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  • Average Low 2020–2025

    45.9 °F

  • Average 2020–2025

    57.1 °F

  • Average High 2020–2025

    68.2 °F
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