Cahokia Weather Forecast

    • 79
    • 99

    Hot

    • 78
    • 100

    Chance Thunderstorms

    • 76
    • 97

    Chance Thunderstorms

    • 76
    • 95

    Partly Sunny

    • 79
    • 100

    Hot

    • 75
    • 100

    Chance Thunderstorms

Today 11 Aug St. Clair

Mostly sunny. Hot with Highs in the upper 90s. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph. Heat index Values up to 109.

Tonight 11 Aug St. Clair

Partly cloudy in the Evening, then clearing. Lows in the upper 70s. Southwest Winds 5 to 10 Mph. Heat index Values up to 107 early in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cahokia Temperature Statistics

August Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 3 August, 2026

    63.6 °F

  • Average August

    76.9 °F

  • Highest 9 August, 2026

    91.9 °F

Climate (2021–2026)

St. Louis Downtown Airport (1.9 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    69.3 °F
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