Cahokia Weather Forecast

    • 65
    • 81

    Chance Rain Showers

    • 66
    • 84

    Slight Chance Thunderstorms

    • 65
    • 85

    Mostly Cloudy

    • 62
    • 81

    Mostly Cloudy

    • 62
    • 82

    Partly Sunny

    • 60
    • 81

    Partly Sunny

Today 26 May St. Clair

Mostly cloudy. A slight chance of Showers and Thunderstorms this afternoon. Highs in the lower 80s. East Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 26 May St. Clair

Mostly cloudy with a slight chance of Thunderstorms. A slight chance of Showers in the Evening, then a chance of Showers after midnight. Lows in the lower 60s. Southeast Winds around 5 Mph in the Evening, becoming light and variable. Chance of rain 30 percent.

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Cahokia Temperature Statistics

May Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 7 May, 2026

    39.7 °F

  • Average May

    64.1 °F

  • Highest 17 May, 2026

    88 °F

Climate (2021–Present)

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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