Cahokia Weather Forecast

    • 47
    • 56

    Increasing Clouds

    • 25
    • 56

    Rain Showers

    • 33
    • 41

    Mostly Sunny

    • 28
    • 58

    Partly Sunny

    • 31
    • 44

    Mostly Cloudy

    • 42
    • 48

    Mostly Cloudy

    • 44
    • 61

    Mostly Cloudy

Today 17 Dec St. Clair

Sunny. Highs in the mid 50s. Southeast Winds around 5 Mph.

Tonight 17 Dec St. Clair

Mostly cloudy. Patchy drizzle after midnight. Not as cool with Lows in the mid 40s. Temperature rising into the lower 50s after midnight. South Winds 15 to 20 Mph.

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Cahokia Temperature Statistics

December Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 14 December, 2025

    7 °F

  • Average December

    29.4 °F

  • Highest 9 December, 2025

    53.1 °F

Climate (2020–Present)

St. Louis Downtown Airport (1.9 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    58 °F

  • Average High 2020–2025

    68.6 °F
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