Cahokia Weather Forecast

    • 58
    • 78

    Thunderstorms Likely

    • 53
    • 71

    Slight Chance Rain Showers

    • 58
    • 74

    Mostly Cloudy

    • 61
    • 77

    Rain Showers Likely

    • 63
    • 82

    Chance Rain Showers

    • 66
    • 85

    Chance Rain Showers

Today 19 May St. Clair

Mostly cloudy. A chance of Showers and Thunderstorms in the Morning, then Showers and Thunderstorms likely in the afternoon. Some Thunderstorms may produce heavy rainfall. Highs in the lower 80s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.

Tonight 19 May St. Clair

Showers likely. Thunderstorms Likely, mainly in the evening. Lows in the mid 50s. North Winds 5 to 10 Mph. Chance of rain 70 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

    62.2 °F

  • Highest 15 May, 2026

    84.7 °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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