Cahokia Weather Forecast

    • 59
    • 83

    Slight Chance Thunderstorms

    • 51
    • 77

    Sunny

    • 58
    • 77

    Chance Thunderstorms

    • 68
    • 90

    Chance Thunderstorms

    • 68
    • 90

    Chance Thunderstorms

    • 72
    • 90

    Chance Thunderstorms

    • 70
    • 92

    Rain Showers Likely

Today 12 May St. Clair

Sunny. Near steady temperature in the lower 80s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 12 May St. Clair

Partly cloudy. A slight chance of Showers and Thunderstorms this evening. Lows in the upper 50s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph, becoming west 5 to 10 Mph after midnight. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cahokia Temperature Statistics

May Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 7 May, 2026

    39.7 °F

  • Average May

    59.8 °F

  • Highest 9 May, 2026

    81.6 °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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