Cahokia Weather Forecast

    • 69
    • 82

    Rain Showers

    • 73
    • 85

    Chance Thunderstorms

    • 76
    • 95

    Mostly Sunny

    • 78
    • 97

    Hot

    • 78
    • 98

    Hot

    • 79
    • 98

    Hot

    • 79
    • 98

    Hot

Today 26 Jun St. Clair

Showers with a chance of Thunderstorms. Some Thunderstorms may produce heavy rainfall. Highs around 80. South Winds 5 to 10 Mph. Chance of rain 90 percent.

Tonight 26 Jun St. Clair

Mostly cloudy. Showers with a chance of Thunderstorms in the Evening, then a chance of Showers and Thunderstorms after midnight. Some Thunderstorms may produce heavy rainfall in the evening. Lows in the upper 60s. Southeast Winds around 5 Mph, becoming southwest after midnight. Chance of rain 80 percent.

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Cahokia Temperature Statistics

June Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 3 June, 2026

    52.6 °F

  • Average June

    74.6 °F

  • Highest 10 June, 2026

    93.7 °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

    58.4 °F

  • Average High 2021–2026

    69.2 °F
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