Cahokia Weather Forecast

    • 67
    • 85

    Increasing Clouds

    • 72
    • 90

    Thunderstorms Likely

    • 70
    • 88

    Rain Showers Likely

    • 67
    • 83

    Chance Thunderstorms

    • 67
    • 85

    Mostly Sunny

    • 67
    • 87

    Mostly Sunny

Today 17 Aug St. Clair

Mostly sunny. Highs in the mid 80s. Northwest Winds 5 to 10 Mph.

Tonight 17 Aug St. Clair

Partly cloudy. Patchy fog after midnight. Lows in the mid 60s. North Winds 5 to 10 Mph.

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  • Temperature Real-Time

Cahokia Temperature Statistics

August Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 3 August, 2026

    63.6 °F

  • Average August

    80.2 °F

  • Highest 11 August, 2026

    96.7 °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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