Six Flags - St. Louis Weather Forecast

    • 17
    • 28

    Becoming Sunny

    • 27
    • 37

    Mostly Sunny

    • 25
    • 44

    Partly Sunny

    • 23
    • 41

    Partly Sunny

    • 28
    • 44

    Mostly Cloudy

    • 24
    • 44

    Partly Sunny

Today 29 Dec St. Louis

Mostly sunny and Blustery. Much cooler with Highs in the upper 20s. Northwest Winds 15 to 25 Mph. Gusts up to 40 Mph in the morning. Wind chill Values as low as 1 above in the morning.

Tonight 29 Dec St. Louis

Partly cloudy in the Evening, then clearing. Lows around 18. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

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Six Flags - St. Louis Temperature Statistics

December Temperature

St. Louis, Spirit Of St. Louis Airport (9.9 miles)

  • Lowest 14 December, 2025

    7 °F

  • Average December

    37.2 °F

  • Highest 26 December, 2025

    69.1 °F

Climate (2020–Present)

St. Louis, Spirit Of St. Louis Airport (9.9 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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