Six Flags - St. Louis Weather Forecast

    • 36
    • 56

    Decreasing Clouds

    • 44
    • 55

    Rain Showers

    • 22
    • 56

    Rain Showers

    • 33
    • 40

    Mostly Sunny

    • 30
    • 56

    Partly Sunny

    • 30
    • 46

    Mostly Cloudy

    • 37
    • 47

    Mostly Cloudy

Today 16 Dec St. Louis

Mostly sunny. Not as cool with Highs in the lower 50s. South Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 16 Dec St. Louis

Mostly cloudy. Lows in the mid 30s. Southwest 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 14 December, 2025

    7 °F

  • Average December

    29.6 °F

  • Highest 9 December, 2025

    57 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    45.9 °F

  • Average 2020–2025

    57 °F

  • Average High 2020–2025

    68.2 °F
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