Collinsville Weather Forecast

    • 48
    • 75

    Mostly Sunny

    • 49
    • 77

    Sunny

    • 48
    • 76

    Mostly Sunny

    • 49
    • 76

    Partly Sunny

    • 50
    • 79

    Mostly Cloudy

    • 51
    • 77

    Mostly Cloudy

    • 49
    • 72

    Mostly Cloudy

Today 21 Oct Madison

Mostly sunny. Highs in the lower 70s.

Tonight 21 Oct Madison

Mostly clear. Lows in the upper 40s. Light and variable Winds.

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  • Temperature Real-Time

Collinsville Temperature Statistics

October Temperature

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

  • Lowest 18 October, 2026

    37.4 °F

  • Average October

    65.6 °F

  • Highest 13 October, 2026

    94.5 °F

Climate (2021–2026)

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

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  • Average Low 2021–2026

    48 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    68.2 °F
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