Cahokia Weather Forecast

    • 70
    • 99

    Slight Chance Thunderstorms

    • 66
    • 95

    Mostly Sunny

    • 67
    • 95

    Mostly Sunny

    • 66
    • 95

    Partly Sunny

    • 67
    • 93

    Chance Thunderstorms

    • 64
    • 87

    Chance Thunderstorms

    • 62
    • 84

    Chance Thunderstorms

Today 14 Sep St. Clair

Mostly sunny with a slight chance of Showers and Thunderstorms. Hot. Near steady temperature in the mid 90s. North Winds around 5 Mph. Chance of rain 20 percent.

Tonight 14 Sep St. Clair

Mostly cloudy with a slight chance of Showers and Thunderstorms this Evening, then partly cloudy after midnight. Lows in the upper 60s. Northeast Winds around 5 Mph. Chance of rain 20 percent.

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Cahokia Temperature Statistics

September Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 8 September, 2025

    44.1 °F

  • Average September

    68.9 °F

  • Highest 12 September, 2025

    93.9 °F

Climate (2020–Present)

St. Louis Downtown Airport (1.9 miles)

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  • Average Low 2020–2025

    47.3 °F

  • Average 2020–2025

    57.8 °F

  • Average High 2020–2025

    68.5 °F
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