Mascoutah Weather Forecast

    • 25
    • 38

    Sunny

    • 35
    • 52

    Mostly Sunny

    • 38
    • 60

    Mostly Cloudy

    • 19
    • 44

    Mostly Cloudy

    • 28
    • 37

    Mostly Cloudy

    • 24
    • 42

    Mostly Cloudy

Today 11 Jan St. Clair

Sunny. Highs in the upper 30s. Northwest Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 11 Jan St. Clair

Clear. Lows in the mid 20s. Southwest Winds 5 to 10 Mph.

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Mascoutah Temperature Statistics

January Temperature

Belleville, Scott AFB/MidAmerica Airport (5 miles)

  • Lowest 4 January, 2026

    21.9 °F

  • Average January

    42.9 °F

  • Highest 6 January, 2026

    69.1 °F

Climate (2021–Present)

Belleville, Scott AFB/MidAmerica Airport (5 miles)

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  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    57.5 °F

  • Average High 2021–2026

    67.7 °F
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