Mascoutah Weather Forecast

    • 69
    • 86

    Isolated Thunderstorms

    • 64
    • 81

    Rain Showers

    • 59
    • 80

    Rain Showers Likely

    • 60
    • 85

    Rain Showers Likely

    • 41
    • 71

    Chance Rain Showers

    • 39
    • 61

    Sunny

    • 46
    • 67

    Mostly Sunny

Today 14 Apr St. Clair

Partly sunny with a slight chance of Showers and Thunderstorms. Highs in the upper 80s. Southwest Winds 15 to 20 Mph. Chance of rain 20 percent.

Tonight 14 Apr St. Clair

Partly cloudy this Evening, then mostly cloudy with isolated Showers and Thunderstorms after midnight. Lows in the upper 60s. Southwest Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mascoutah Temperature Statistics

April Temperature

Belleville, Scott AFB/MidAmerica Airport (5 miles)

  • Lowest 6 April, 2026

    38.8 °F

  • Average April

    61.2 °F

  • Highest 3 April, 2026

    81.3 °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

    57.7 °F

  • Average High 2021–2026

    68 °F
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