Cahokia Weather Forecast

    • 67
    • 85

    Becoming Sunny

    • 71
    • 89

    Mostly Sunny

    • 67
    • 87

    Mostly Sunny

    • 64
    • 84

    Partly Sunny

    • 66
    • 84

    Slight Chance Thunderstorms

    • 69
    • 88

    Partly Sunny

Today 20 Aug St. Clair

Mostly cloudy late this Morning, then becoming partly sunny. Isolated Showers this afternoon. Highs in the lower 80s. North Winds around 5 Mph. Chance of rain 20 percent.

Tonight 20 Aug St. Clair

Mostly clear. Patchy fog after midnight. Lows in the mid 60s. Northeast Winds around 5 Mph.

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Cahokia Temperature Statistics

August Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 3 August, 2026

    63.6 °F

  • Average August

    80 °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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