Collinsville Weather Forecast

    • 52
    • 72

    Rain Showers

    • 43
    • 65

    Mostly Sunny

    • 51
    • 71

    Sunny

    • 43
    • 66

    Sunny

    • 40
    • 63

    Mostly Sunny

    • 48
    • 69

    Chance Rain Showers

    • 50
    • 63

    Chance Rain Showers

Today 18 Oct Madison

Showers with Thunderstorms likely. Cooler. Near steady temperature in the upper 60s. Southwest Winds around 10 Mph with Gusts up to 20 Mph. Chance of rain near 100 percent.

Tonight 18 Oct Madison

Showers with Thunderstorms likely this Evening, then Showers likely after midnight. Locally heavy rainfall possible this evening. Cooler with Lows in the lower 50s. West Winds 5 to 10 Mph with Gusts up to 20 Mph, increasing to northwest 15 to 20 Mph with Gusts up to 30 Mph after midnight. Chance of rain near 100 percent.

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Collinsville Temperature Statistics

October Temperature

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

  • Lowest 10 October, 2025

    43 °F

  • Average October

    68 °F

  • Highest 3 October, 2025

    90 °F

Climate (2020–Present)

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

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  • Average Low 2020–2025

    47.5 °F

  • Average 2020–2025

    57.4 °F

  • Average High 2020–2025

    67.5 °F
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