Cahokia Weather Forecast

    • 35
    • 47

    Mostly Cloudy

    • 20
    • 40

    Mostly Cloudy

    • 25
    • 34

    Partly Sunny

    • 41
    • 52

    Mostly Cloudy

    • 28
    • 49

    Slight Chance Rain/Snow

    • 20
    • 39

    Mostly Cloudy

    • 10
    • 28

    Partly Sunny

Today 6 Dec St. Clair

Mostly cloudy. Highs in the mid 40s. Temperature falling into the upper 30s late. Southeast Winds around 5 Mph.

Tonight 6 Dec St. Clair

Cloudy. A slight chance of rain after midnight. Near steady temperature in the mid 30s. South Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 20 percent.

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Cahokia Temperature Statistics

December Temperature

St. Louis Downtown Airport (1.9 miles)

  • Lowest 4 December, 2025

    14 °F

  • Average December

    25 °F

  • Highest 3 December, 2025

    37 °F

Climate (2020–Present)

St. Louis Downtown Airport (1.9 miles)

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  • Average Low 2020–2025

    47.5 °F

  • Average 2020–2025

    58 °F

  • Average High 2020–2025

    68.6 °F
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