Belleville Weather Forecast

    • 69
    • 95

    Becoming Sunny

    • 63
    • 84

    Partly Sunny

    • 63
    • 81

    Partly Sunny

    • 66
    • 81

    Chance Rain Showers

    • 70
    • 88

    Mostly Sunny

    • 74
    • 95

    Mostly Sunny

Today 21 Jul St. Clair

Partly sunny with a slight chance of Showers and Thunderstorms in the Morning, then sunny in the afternoon. Humid with Highs in the mid 90s. Northwest Winds 10 to 15 Mph. Chance of rain 20 percent. Heat index Values up to 107.

Tonight 21 Jul St. Clair

Mostly clear. Cooler with Lows in the upper 60s. North Winds 10 to 15 Mph.

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Belleville Temperature Statistics

July Temperature

Belleville, Scott AFB/MidAmerica Airport (7.5 miles)

  • Lowest 13 July, 2026

    70 °F

  • Average July

    80.7 °F

  • Highest 2 July, 2026

    95.5 °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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