Six Flags - St. Louis Weather Forecast

    • 30
    • 41

    Increasing Clouds

    • 22
    • 42

    Becoming Sunny

    • 10
    • 38

    Mostly Cloudy

    • 2
    • 15

    Chance Snow

    • 6
    • 13

    Chance Snow

    • 5
    • 22

    Partly Sunny

    • 10
    • 26

    Mostly Sunny

Today 20 Jan St. Louis

Mostly sunny. Not as cool with Highs in the mid 30s. South Winds 10 to 15 Mph.

Tonight 20 Jan St. Louis

Partly cloudy this Evening, then becoming mostly cloudy. Not as cool with Lows in the upper 20s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Six Flags - St. Louis Temperature Statistics

January Temperature

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

  • Lowest 18 January, 2026

    8.1 °F

  • Average January

    39 °F

  • Highest 6 January, 2026

    68 °F

Climate (2021–Present)

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

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  • Average Low 2021–2026

    46 °F

  • Average 2021–2026

    57.1 °F

  • Average High 2021–2026

    68.4 °F
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