Collinsville Weather Forecast

    • 39
    • 53

    Rain Likely

    • 25
    • 45

    Slight Chance Rain

    • 25
    • 35

    Mostly Sunny

    • 36
    • 51

    Mostly Sunny

    • 36
    • 55

    Mostly Cloudy

    • 25
    • 42

    Mostly Cloudy

Today 9 Jan Madison

Mostly cloudy. Cooler with Highs in the lower 50s. Northwest Winds 10 to 15 Mph. Gusts up to 30 Mph in the morning.

Tonight 9 Jan Madison

Mostly cloudy. Rain likely after midnight. Lows in the upper 30s. North Winds around 5 Mph. Chance of rain 60 percent.

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Collinsville Temperature Statistics

January Temperature

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

  • Lowest 4 January, 2026

    21.9 °F

  • Average January

    38.4 °F

  • Highest 6 January, 2026

    69.1 °F

Climate (2021–Present)

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

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  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    57.5 °F

  • Average High 2021–2026

    67.6 °F
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