Cahokia Weather Forecast

    • 64
    • 83

    Chance Rain Showers

    • 66
    • 84

    Mostly Cloudy

    • 64
    • 81

    Slight Chance Thunderstorms

    • 63
    • 84

    Slight Chance Rain Showers

    • 61
    • 81

    Partly Sunny

    • 61
    • 84

    Mostly Sunny

Today 27 May St. Clair

Mostly cloudy this Morning, then becoming partly sunny. A chance of Showers. A slight chance of Thunderstorms this Morning, then a chance of Thunderstorms this afternoon. Highs in the lower 80s. North Winds around 5 Mph. Chance of rain 40 percent.

Tonight 27 May St. Clair

Mostly cloudy. Patchy fog after midnight. Lows in the lower 60s. Northeast Winds around 5 Mph.

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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

    64.5 °F

  • Highest 17 May, 2026

    89.7 °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

    69.2 °F
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