Six Flags - St. Louis Weather Forecast

    • 66
    • 87

    Decreasing Clouds

    • 64
    • 83

    Mostly Sunny

    • 64
    • 86

    Mostly Sunny

    • 61
    • 87

    Mostly Sunny

    • 56
    • 81

    Mostly Sunny

    • 54
    • 75

    Partly Sunny

Today 20 Aug St. Louis

Mostly sunny. Highs in the upper 80s. Northeast Winds 5 to 10 Mph.

Tonight 20 Aug St. Louis

Mostly clear. Lows in the mid 60s. Northeast Winds 5 to 10 Mph.

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Six Flags - St. Louis Temperature Statistics

August Temperature

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

  • Lowest 3 August, 2025

    55.7 °F

  • Average August

    78.9 °F

  • Highest 16 August, 2025

    98.7 °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

    56.9 °F

  • Average High 2020–2025

    68.1 °F
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