Belleville Weather Forecast

    • 57
    • 79

    Becoming Sunny

    • 57
    • 77

    Mostly Sunny

    • 62
    • 81

    Partly Sunny

    • 54
    • 75

    Thunderstorms Likely

    • 53
    • 74

    Chance Rain Showers

    • 55
    • 71

    Chance Rain Showers

Today 21 Apr St. Clair

Sunny. Not as cool with Highs in the upper 70s. Southwest Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 21 Apr St. Clair

Mostly clear. Near steady temperature in the lower 50s. South Winds 5 to 10 Mph with Gusts up to 20 Mph.

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Belleville Temperature Statistics

April Temperature

Belleville, Scott AFB/MidAmerica Airport (7.5 miles)

  • Lowest 6 April, 2026

    38.8 °F

  • Average April

    63.3 °F

  • Highest 17 April, 2026

    85.3 °F

Climate (2021–Present)

Belleville, Scott AFB/MidAmerica Airport (7.5 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    57.7 °F

  • Average High 2021–2026

    68 °F
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