Six Flags - St. Louis Weather Forecast

    • 66
    • 85

    Mostly Sunny

    • 69
    • 89

    Becoming Sunny

    • 71
    • 91

    Mostly Sunny

    • 72
    • 92

    Mostly Sunny

    • 73
    • 92

    Mostly Sunny

    • 72
    • 92

    Slight Chance Thunderstorms

    • 72
    • 91

    Slight Chance Thunderstorms

Today 5 Aug St. Louis

Mostly sunny with a slight chance of Showers and Thunderstorms. Near steady temperature in the mid 80s. Northeast Winds around 5 Mph. Chance of rain 20 percent.

Tonight 5 Aug St. Louis

Clear with a slight chance of Showers this Evening, then partly cloudy after midnight. Patchy fog after midnight. Lows in the upper 60s. East Winds around 5 Mph. Chance of rain 20 percent.

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Six Flags - St. Louis Temperature Statistics

August Temperature

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

  • Lowest 2 August, 2025

    57 °F

  • Average August

    69.2 °F

  • Highest 1 August, 2025

    81.6 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    45.8 °F

  • Average 2020–2025

    56.8 °F

  • Average High 2020–2025

    68.1 °F
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