Cahokia Weather Forecast

    • 69
    • 79

    Mostly Cloudy

    • 70
    • 85

    Chance Rain Showers

    • 70
    • 92

    Partly Sunny

    • 68
    • 91

    Slight Chance Thunderstorms

    • 71
    • 93

    Mostly Sunny

    • 69
    • 94

    Chance Rain Showers

    • 69
    • 90

    Chance Rain Showers

Today 10 Sep St. Clair

Mostly cloudy with a slight chance of Showers and Thunderstorms. Much cooler. Near steady temperature in the upper 70s. Northwest Winds around 5 Mph. Chance of rain 20 percent.

Tonight 10 Sep St. Clair

Mostly cloudy. Patchy fog after midnight. Lows in the upper 60s. North Winds around 5 Mph this Evening, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cahokia Temperature Statistics

September Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 8 September, 2026

    60.1 °F

  • Average September

    83.9 °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

    47.7 °F

  • Average 2021–2026

    58.6 °F

  • Average High 2021–2026

    69.4 °F
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