Cahokia Weather Forecast

    • 53
    • 69

    Decreasing Clouds

    • 57
    • 73

    Rain Showers

    • 59
    • 74

    Rain Showers

    • 62
    • 81

    Chance Thunderstorms

    • 63
    • 83

    Chance Thunderstorms

    • 66
    • 84

    Chance Thunderstorms

Today 20 May St. Clair

Mostly cloudy. Cooler with Highs in the upper 60s. North Winds 5 to 10 Mph.

Tonight 20 May St. Clair

Mostly cloudy in the Evening, then becoming partly cloudy. Lows in the lower 50s. Northeast Winds 5 to 10 Mph.

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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

    63.1 °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

    69.3 °F
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