Cahokia Weather Forecast

    • 76
    • 97

    Thunderstorms

    • 75
    • 99

    Hot

    • 75
    • 97

    Hot

    • 74
    • 99

    Slight Chance Thunderstorms

    • 69
    • 95

    Slight Chance Thunderstorms

    • 65
    • 89

    Chance Rain Showers

    • 63
    • 84

    Partly Sunny

Today 16 Sep St. Clair

Mostly sunny with a chance of Showers and Thunderstorms. Highs in the mid 90s. Southwest Winds around 5 Mph. Chance of rain 50 percent. Heat index Values up to 106.

Tonight 16 Sep St. Clair

Mostly cloudy with scattered Thunderstorms with a slight chance of Showers this Evening, then mostly clear after midnight. Lows in the mid 70s. South Winds around 5 Mph. Chance of rain 40 percent.

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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

    59.6 °F

  • Average September

    81.3 °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

    69.4 °F
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