Belleville Weather Forecast

    • 77
    • 100

    Hot

    • 74
    • 101

    Hot

    • 68
    • 95

    Mostly Sunny

    • 69
    • 93

    Mostly Sunny

    • 76
    • 98

    Hot

    • 77
    • 101

    Hot

Today 4 Sep St. Clair

Sunny, hot with Highs in the upper 90s. Southwest Winds around 5 Mph. Heat index Values up to 106.

Tonight 4 Sep St. Clair

Mostly clear. Lows in the upper 70s. South Winds around 5 Mph in the Evening, becoming light and variable. Heat index Values up to 104 early in the evening.

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Belleville Temperature Statistics

September Temperature

Belleville, Scott AFB/MidAmerica Airport (7.5 miles)

  • Lowest 1 September, 2026

    71.6 °F

  • Average September

    85.7 °F

  • Highest 2 September, 2026

    100 °F

Climate (2021–2026)

Belleville, Scott AFB/MidAmerica Airport (7.5 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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