Cahokia Weather Forecast

    • 65
    • 85

    Increasing Clouds

    • 71
    • 91

    Mostly Cloudy

    • 66
    • 90

    Rain Showers Likely

    • 59
    • 72

    Chance Thunderstorms

    • 59
    • 72

    Chance Rain Showers

    • 54
    • 72

    Partly Sunny

Today 29 Sep St. Clair

Sunny. Highs in the lower 80s. Southeast Winds around 5 Mph.

Tonight 29 Sep St. Clair

Partly cloudy. Not as cool with Lows in the mid 60s. Southeast Winds around 5 Mph.

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  • Temperature Real-Time

Cahokia Temperature Statistics

September Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 25 September, 2026

    55.7 °F

  • Average September

    78.5 °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

    58.7 °F

  • Average High 2021–2026

    69.5 °F
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