Cahokia Weather Forecast

    • 80
    • 99

    Hot

    • 72
    • 94

    Partly Sunny

    • 70
    • 90

    Mostly Sunny

    • 72
    • 91

    Chance Rain Showers

    • 70
    • 86

    Chance Thunderstorms

    • 70
    • 85

    Slight Chance Thunderstorms

Today 27 Jul St. Clair

Sunny, hot with Highs in the mid 90s. South Winds 5 to 10 Mph. Heat index Values up to 113.

Tonight 27 Jul St. Clair

Mostly clear. Humid with Lows in the upper 70s. West Winds 5 to 10 Mph. Heat index Values up to 112 early in the evening.

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Cahokia Temperature Statistics

July Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 23 July, 2026

    61.6 °F

  • Average July

    80.3 °F

  • Highest 2 July, 2026

    96.7 °F

Climate (2021–2026)

St. Louis Downtown Airport (1.9 miles)

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  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    69.3 °F
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