Weldon Spring Weather Forecast

    • 24
    • 44

    Partly Sunny

    • 28
    • 38

    Mostly Cloudy

    • 24
    • 42

    Mostly Cloudy

    • 24
    • 40

    Partly Sunny

    • 34
    • 46

    Partly Sunny

    • 36
    • 57

    Mostly Sunny

Today 31 Dec St. Charles

Mostly cloudy this Morning, then becoming partly sunny. Highs in the lower 40s. West Winds 5 to 10 Mph.

Tonight 31 Dec St. Charles

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the mid 20s. West Winds around 5 Mph, becoming north after midnight.

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Weldon Spring Temperature Statistics

December Temperature

St. Louis, Spirit Of St. Louis Airport (3.7 miles)

  • Lowest 14 December, 2025

    7 °F

  • Average December

    37.7 °F

  • Highest 28 December, 2025

    77 °F

Climate (2020–Present)

St. Louis, Spirit Of St. Louis Airport (3.7 miles)

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  • Average Low 2020–2025

    46 °F

  • Average 2020–2025

    57.1 °F

  • Average High 2020–2025

    68.3 °F
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