Six Flags - St. Louis Weather Forecast

    • 36
    • 46

    Increasing Clouds

    • 17
    • 40

    Mostly Cloudy

    • 24
    • 33

    Partly Sunny

    • 38
    • 50

    Mostly Cloudy

    • 25
    • 45

    Mostly Cloudy

    • 21
    • 38

    Mostly Cloudy

Today 6 Dec St. Louis

Mostly sunny. Highs in the lower 40s. West Winds around 5 Mph, becoming southeast this afternoon.

Tonight 6 Dec St. Louis

Mostly cloudy with a 20 percent chance of rain. Near steady temperature in the mid 30s. Southeast Winds 5 to 10 Mph.

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Six Flags - St. Louis Temperature Statistics

December Temperature

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

  • Lowest 3 December, 2025

    15.1 °F

  • Average December

    25.7 °F

  • Highest 3 December, 2025

    37.9 °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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