Collinsville Weather Forecast

    • 63
    • 82

    Decreasing Clouds

    • 66
    • 86

    Partly Sunny

    • 62
    • 87

    Partly Sunny

    • 57
    • 81

    Mostly Sunny

    • 55
    • 76

    Partly Sunny

    • 55
    • 76

    Partly Sunny

Today 21 Aug Madison

Mostly sunny. Highs in the lower 80s. Northeast Winds 5 to 10 Mph.

Tonight 21 Aug Madison

Partly cloudy. Lows in the mid 60s. Northeast Winds around 5 Mph.

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Collinsville Temperature Statistics

August Temperature

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

  • Lowest 3 August, 2025

    61.2 °F

  • Average August

    79.3 °F

  • Highest 16 August, 2025

    96.8 °F

Climate (2020–Present)

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

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  • Average Low 2020–2025

    47.4 °F

  • Average 2020–2025

    57.3 °F

  • Average High 2020–2025

    67.4 °F
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