Collinsville Weather Forecast

    • 58
    • 70

    Mostly Cloudy

    • 61
    • 75

    Partly Sunny

    • 58
    • 79

    Mostly Cloudy

    • 59
    • 75

    Mostly Cloudy

    • 60
    • 81

    Partly Sunny

    • 63
    • 85

    Partly Sunny

Today 23 Sep Madison

Partly sunny. Near steady temperature around 70. Northeast Winds 5 to 10 Mph.

Tonight 23 Sep Madison

Mostly cloudy. Lows in the upper 50s. Northeast Winds 5 to 10 Mph.

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Collinsville Temperature Statistics

September Temperature

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

  • Lowest 8 September, 2026

    60.1 °F

  • Average September

    80.7 °F

  • Highest 5 September, 2026

    101.8 °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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