Cahokia Weather Forecast

    • 75
    • 100

    Hot

    • 69
    • 95

    Rain Showers Likely

    • 62
    • 82

    Rain Showers Likely

    • 56
    • 74

    Mostly Cloudy

    • 57
    • 75

    Partly Sunny

    • 60
    • 77

    Mostly Cloudy

    • 60
    • 80

    Partly Sunny

Today 19 Sep St. Clair

Partly cloudy. Lows in the upper 50s. Highs in the lower 80s.

Tonight 19 Sep St. Clair

Partly cloudy. Lows in the lower 70s. Southwest Winds around 5 Mph.

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  • Temperature Real-Time

Cahokia Temperature Statistics

September Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 8 September, 2026

    59.6 °F

  • Average September

    81.9 °F

  • Highest 5 September, 2026

    102.7 °F

Climate (2021–2026)

St. Louis Downtown Airport (1.9 miles)

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  • Average Low 2021–2026

    47.8 °F

  • Average 2021–2026

    58.6 °F

  • Average High 2021–2026

    69.5 °F
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