Collinsville Weather Forecast

    • 66
    • 92

    Decreasing Clouds

    • 62
    • 88

    Mostly Sunny

    • 61
    • 86

    Mostly Sunny

    • 67
    • 89

    Mostly Sunny

    • 73
    • 93

    Mostly Sunny

    • 75
    • 96

    Partly Sunny

Today 26 Aug Madison

Sunny. Highs in the lower 90s. West Winds 5 to 10 Mph.

Tonight 26 Aug Madison

Mostly clear. Lows in the mid 60s. Northwest Winds 5 to 10 Mph.

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Collinsville Temperature Statistics

August Temperature

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

  • Lowest 24 August, 2026

    57.2 °F

  • Average August

    78.6 °F

  • Highest 11 August, 2026

    95.7 °F

Climate (2021–2026)

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

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  • Average Low 2021–2026

    47.9 °F

  • Average 2021–2026

    57.9 °F

  • Average High 2021–2026

    68.1 °F
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