Cahokia Weather Forecast

    • 73
    • 92

    Thunderstorms

    • 72
    • 86

    Thunderstorms

    • 71
    • 88

    Chance Thunderstorms

    • 74
    • 91

    Mostly Sunny

    • 76
    • 93

    Mostly Sunny

    • 78
    • 97

    Hot

Today 5 Aug St. Clair

Mostly sunny. Highs around 90. South Winds 5 to 10 Mph.

Tonight 5 Aug St. Clair

Mostly cloudy. Scattered Showers and Thunderstorms in the Evening, then numerous Showers and Thunderstorms after midnight. Lows in the lower 70s. South Winds 5 to 10 Mph. Chance of rain 70 percent.

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Cahokia Temperature Statistics

August Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 2 August, 2026

    68 °F

  • Average August

    73.4 °F

  • Highest 2 August, 2026

    82 °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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