Cahokia Weather Forecast

    • 79
    • 101

    Hot

    • 75
    • 103

    Hot

    • 69
    • 96

    Mostly Sunny

    • 69
    • 94

    Mostly Sunny

    • 77
    • 99

    Hot

    • 78
    • 102

    Hot

Today 4 Sep St. Clair

Sunny, hot. Near steady temperature in the upper 90s. Southwest Winds around 5 Mph. Heat index Values up to 106.

Tonight 4 Sep St. Clair

Mostly clear. Lows in the upper 70s. South Winds around 5 Mph this Evening, becoming light and variable. Heat index Values up to 104 early this evening.

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Cahokia Temperature Statistics

September Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 1 September, 2026

    70.6 °F

  • Average September

    86.2 °F

  • Highest 1 September, 2026

    100.7 °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

    58.6 °F

  • Average High 2021–2026

    69.4 °F
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