Belleville Weather Forecast

    • 30
    • 37

    Increasing Clouds

    • 24
    • 46

    Partly Sunny

    • 12
    • 38

    Partly Sunny

    • 2
    • 19

    Mostly Cloudy

    • 5
    • 13

    Chance Snow

    • 10
    • 23

    Mostly Sunny

Today 20 Jan St. Clair

Mostly sunny. Not as cool with Highs in the upper 30s. South Winds 5 to 10 Mph. Wind chill Values as low as 5 above in the morning.

Tonight 20 Jan St. Clair

Partly cloudy in the Evening, then becoming mostly cloudy. Not as cool with Lows in the lower 30s. Temperature rising into the mid 30s after midnight. South Winds 10 to 15 Mph with Gusts up to 30 Mph.

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Belleville Temperature Statistics

January Temperature

Belleville, Scott AFB/MidAmerica Airport (7.5 miles)

  • Lowest 17 January, 2026

    16.2 °F

  • Average January

    39.7 °F

  • Highest 6 January, 2026

    69.1 °F

Climate (2021–Present)

Belleville, Scott AFB/MidAmerica Airport (7.5 miles)

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  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    57.5 °F

  • Average High 2021–2026

    67.7 °F
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