Cahokia Weather Forecast

    • 58
    • 73

    Mostly Cloudy

    • 60
    • 72

    Rain Showers Likely

    • 63
    • 83

    Chance Rain Showers

    • 63
    • 81

    Chance Thunderstorms

    • 65
    • 82

    Chance Thunderstorms

    • 67
    • 84

    Chance Thunderstorms

Today 21 May St. Clair

Partly sunny. Highs in the lower 70s. Northeast Winds 5 to 10 Mph.

Tonight 21 May St. Clair

Mostly cloudy. Lows in the mid 50s. Northeast Winds 5 to 10 Mph with Gusts up to 20 Mph.

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  • Temperature Real-Time

Cahokia Temperature Statistics

May Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 7 May, 2026

    39.7 °F

  • Average May

    63.5 °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

    69.3 °F
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