Collinsville Weather Forecast

    • 58
    • 88

    Mostly Sunny

    • 59
    • 83

    Sunny

    • 62
    • 89

    Mostly Sunny

    • 59
    • 87

    Chance Rain Showers

    • 60
    • 79

    Partly Sunny

    • 58
    • 90

    Partly Sunny

    • 52
    • 74

    Slight Chance Rain Showers

Today 7 Oct Madison

Mostly sunny with a 20 percent chance of Showers. Highs in the lower 70s.

Tonight 7 Oct Madison

Clear. Lows in the upper 50s. North Winds around 5 Mph.

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  • Temperature Real-Time

Collinsville Temperature Statistics

October Temperature

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

  • Lowest 4 October, 2026

    49.3 °F

  • Average October

    67.5 °F

  • Highest 1 October, 2026

    92.3 °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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