Belleville Weather Forecast

    • 73
    • 94

    Mostly Sunny

    • 73
    • 93

    Slight Chance Thunderstorms

    • 73
    • 92

    Chance Rain Showers

    • 72
    • 91

    Chance Thunderstorms

    • 73
    • 90

    Chance Thunderstorms

    • 72
    • 91

    Chance Thunderstorms

Today 9 Aug St. Clair

Sunny. Near steady temperature in the lower 90s. South Winds 10 to 15 Mph. Heat index Values up to 102.

Tonight 9 Aug St. Clair

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 70s. South Winds 5 to 10 Mph.

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  • Temperature Real-Time

Belleville Temperature Statistics

August Temperature

Belleville, Scott AFB/MidAmerica Airport (7.5 miles)

  • Lowest 3 August, 2025

    61.2 °F

  • Average August

    74.8 °F

  • Highest 7 August, 2025

    91.2 °F

Climate (2020–Present)

Belleville, Scott AFB/MidAmerica Airport (7.5 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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