Six Flags - St. Louis Weather Forecast

    • 77
    • 95

    Decreasing Clouds

    • 77
    • 96

    Partly Sunny

    • 74
    • 95

    Chance Thunderstorms

    • 72
    • 91

    Rain Showers Likely

    • 72
    • 88

    Chance Rain Showers

    • 73
    • 91

    Chance Rain Showers

Today 10 Aug St. Louis

Mostly sunny. A slight chance of Showers and Thunderstorms this morning. Hot with Highs in the mid 90s. Southwest Winds 5 to 10 Mph. Chance of rain 20 percent. Heat index Values up to 109 this afternoon.

Tonight 10 Aug St. Louis

Mostly clear in the Evening, then becoming partly cloudy. Lows in the upper 70s. South Winds 5 to 10 Mph. Heat index Values up to 108 early in the evening.

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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, 2026

    62.7 °F

  • Average August

    75.2 °F

  • Highest 7 August, 2026

    90 °F

Climate (2021–2026)

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

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  • Average Low 2021–2026

    46.1 °F

  • Average 2021–2026

    57.5 °F

  • Average High 2021–2026

    68.9 °F
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