Collinsville Weather Forecast

    • 38
    • 50

    Increasing Clouds

    • 26
    • 46

    Breezy

    • 27
    • 38

    Mostly Cloudy

    • 14
    • 35

    Mostly Cloudy

    • 14
    • 24

    Mostly Cloudy

    • 20
    • 28

    Mostly Cloudy

Today 9 Dec Madison

Mostly sunny. Not as cool with Highs in the lower 50s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 9 Dec Madison

Mostly cloudy and not as cool. Near steady temperature in the mid 40s. Southwest Winds around 15 Mph with Gusts up to 30 Mph.

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Collinsville Temperature Statistics

December Temperature

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

  • Lowest 5 December, 2025

    10.4 °F

  • Average December

    28.5 °F

  • Highest 6 December, 2025

    50 °F

Climate (2020–Present)

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

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  • Average Low 2020–2025

    47.6 °F

  • Average 2020–2025

    57.4 °F

  • Average High 2020–2025

    67.6 °F
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