Cahokia Weather Forecast

    • 80
    • 93

    Mostly Sunny

    • 70
    • 97

    Slight Chance Thunderstorms

    • 64
    • 85

    Partly Sunny

    • 65
    • 83

    Partly Sunny

    • 67
    • 81

    Chance Rain Showers

    • 71
    • 89

    Mostly Sunny

    • 76
    • 96

    Mostly Sunny

Today 20 Jul St. Clair

Patchy smoke late this morning. Sunny. Highs in the lower 90s. Southeast Winds around 5 Mph, becoming south this afternoon. Heat index Values up to 106 this afternoon.

Tonight 20 Jul St. Clair

Mostly clear this Evening, then becoming mostly cloudy. Lows in the upper 70s. Southwest Winds 5 to 10 Mph. Heat index Values up to 104 early this evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cahokia Temperature Statistics

July Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 13 July, 2026

    67.6 °F

  • Average July

    81.1 °F

  • Highest 2 July, 2026

    96.7 °F

Climate (2021–2026)

St. Louis Downtown Airport (1.9 miles)

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  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    69.3 °F
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