Mascoutah Weather Forecast

    • 68
    • 89

    Partly Sunny

    • 72
    • 94

    Partly Sunny

    • 75
    • 97

    Hot

    • 77
    • 99

    Hot

    • 78
    • 99

    Hot

    • 76
    • 98

    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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Mascoutah Temperature Statistics

August Temperature

Belleville, Scott AFB/MidAmerica Airport (5 miles)

  • Lowest 24 August, 2026

    57.2 °F

  • Average August

    78.5 °F

  • Highest 11 August, 2026

    95.7 °F

Climate (2021–2026)

Belleville, Scott AFB/MidAmerica Airport (5 miles)

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  • Average Low 2021–2026

    47.9 °F

  • Average 2021–2026

    57.9 °F

  • Average High 2021–2026

    68.1 °F
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