Glen Carbon Weather Forecast

    • 64
    • 82

    Chance Rain Showers

    • 63
    • 81

    Chance Rain Showers

    • 64
    • 84

    Mostly Cloudy

    • 62
    • 80

    Mostly Cloudy

    • 61
    • 81

    Partly Sunny

    • 59
    • 81

    Partly Sunny

    • 59
    • 81

    Mostly Sunny

Today 26 May Madison

Mostly cloudy with a slight chance of Showers and Thunderstorms. Near steady temperature in the upper 70s. East Winds 5 to 10 Mph. Chance of rain 20 percent.

Tonight 26 May Madison

Mostly cloudy. Scattered Showers with isolated Thunderstorms this Evening, then a chance of Showers and Thunderstorms after midnight. Lows in the lower 60s. East Winds 5 to 10 Mph, becoming north after midnight. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Glen Carbon Temperature Statistics

May Temperature

St. Louis Regional Airport (9.9 miles)

  • Lowest 7 May, 2026

    39.6 °F

  • Average May

    61.4 °F

  • Highest 17 May, 2026

    86 °F

Climate (2021–Present)

St. Louis Regional Airport (9.9 miles)

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  • Average Low 2021–2026

    46.5 °F

  • Average 2021–2026

    54.4 °F

  • Average High 2021–2026

    66.7 °F
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