Caseyville Weather Forecast

    • 74
    • 92

    Mostly Sunny

    • 75
    • 91

    Chance Thunderstorms

    • 76
    • 92

    Chance Thunderstorms

    • 77
    • 94

    Slight Chance Thunderstorms

    • 76
    • 95

    Partly Sunny

    • 76
    • 95

    Slight Chance Thunderstorms

Today 15 Jul St. Clair

Sunny. Highs in the lower 90s. East Winds around 5 Mph.

Tonight 15 Jul St. Clair

Partly cloudy in the Evening, then becoming mostly clear. Humid with Lows in the lower 70s. Southeast Winds around 5 Mph in the Evening, becoming light and variable.

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Caseyville Temperature Statistics

July Temperature

St. Louis Downtown Airport (8.1 miles)

  • Lowest 5 July, 2026

    68.6 °F

  • Average July

    80.7 °F

  • Highest 2 July, 2026

    96.7 °F

Climate (2021–2026)

St. Louis Downtown Airport (8.1 miles)

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  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    58.4 °F

  • Average High 2021–2026

    69.3 °F
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