Caseyville Weather Forecast

    • 26
    • 38

    Mostly Sunny

    • 37
    • 52

    Mostly Sunny

    • 39
    • 60

    Mostly Cloudy

    • 20
    • 44

    Mostly Cloudy

    • 29
    • 38

    Mostly Cloudy

    • 25
    • 43

    Mostly Cloudy

Today 11 Jan St. Clair

Sunny. Highs in the upper 30s. Northwest Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 11 Jan St. Clair

Clear. Lows in the mid 20s. Southwest Winds 5 to 10 Mph.

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Caseyville Temperature Statistics

January Temperature

St. Louis Downtown Airport (8.1 miles)

  • Lowest 4 January, 2026

    19 °F

  • Average January

    42.9 °F

  • Highest 6 January, 2026

    68 °F

Climate (2021–Present)

St. Louis Downtown Airport (8.1 miles)

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  • Average Low 2021–2026

    47.5 °F

  • Average 2021–2026

    58.1 °F

  • Average High 2021–2026

    68.7 °F
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