Glen Carbon Weather Forecast

    • 74
    • 93

    Becoming Sunny

    • 75
    • 93

    Mostly Sunny

    • 73
    • 93

    Partly Sunny

    • 73
    • 93

    Chance Thunderstorms

    • 72
    • 91

    Chance Thunderstorms

    • 71
    • 89

    Chance Thunderstorms

Today 8 Aug Madison

Sunny. Highs in the mid 90s. South Winds 5 to 10 Mph. Heat index Values up to 101.

Tonight 8 Aug Madison

Mostly clear. Lows in the mid 70s. South Winds 10 to 15 Mph.

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Glen Carbon Temperature Statistics

August Temperature

St. Louis Regional Airport (9.9 miles)

  • Lowest 3 August, 2025

    56.7 °F

  • Average August

    69 °F

  • Highest 6 August, 2025

    87.8 °F

Climate (2020–Present)

St. Louis Regional Airport (9.9 miles)

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  • Average Low 2020–2025

    46 °F

  • Average 2020–2025

    53.9 °F

  • Average High 2020–2025

    66 °F
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