Mascoutah Weather Forecast

    • 74
    • 93

    Mostly Sunny

    • 74
    • 93

    Mostly Sunny

    • 73
    • 93

    Mostly Sunny

    • 72
    • 92

    Partly Sunny

    • 72
    • 90

    Chance Thunderstorms

    • 71
    • 89

    Slight Chance Thunderstorms

Today 8 Aug St. Clair

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

Tonight 8 Aug St. Clair

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

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Mascoutah Temperature Statistics

August Temperature

Belleville, Scott AFB/MidAmerica Airport (5 miles)

  • Lowest 3 August, 2025

    61.2 °F

  • Average August

    73 °F

  • Highest 5 August, 2025

    86.4 °F

Climate (2020–Present)

Belleville, Scott AFB/MidAmerica Airport (5 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    57.2 °F

  • Average High 2020–2025

    67.3 °F
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