Caseyville Weather Forecast

    • 70
    • 90

    Increasing Clouds

    • 74
    • 95

    Partly Sunny

    • 78
    • 98

    Hot

    • 80
    • 100

    Hot

    • 80
    • 100

    Hot

    • 78
    • 99

    Slight Chance Thunderstorms

Today 29 Aug St. Clair

Mostly sunny. Highs in the upper 80s. South Winds 5 to 10 Mph.

Tonight 29 Aug St. Clair

Partly cloudy. Lows in the upper 60s. South Winds 5 to 10 Mph.

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Caseyville Temperature Statistics

August Temperature

St. Louis Downtown Airport (8.1 miles)

  • Lowest 24 August, 2026

    56.6 °F

  • Average August

    78.6 °F

  • Highest 11 August, 2026

    96.7 °F

Climate (2021–2026)

St. Louis Downtown Airport (8.1 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    58.5 °F

  • Average High 2021–2026

    69.3 °F
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