Collinsville Weather Forecast

    • 43
    • 66

    Becoming Sunny

    • 46
    • 67

    Partly Sunny

    • 41
    • 62

    Partly Sunny

    • 43
    • 62

    Mostly Sunny

    • 50
    • 71

    Mostly Sunny

    • 52
    • 73

    Partly Sunny

Today 29 Apr Madison

Sunny. Highs in the mid 60s. Northwest Winds 10 to 15 Mph.

Tonight 29 Apr Madison

Showers likely. Lows around 50. North Winds 5 to 10 Mph. Chance of rain 70 percent.

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Collinsville Temperature Statistics

April Temperature

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

  • Lowest 6 April, 2026

    38.8 °F

  • Average April

    62.8 °F

  • Highest 17 April, 2026

    85.3 °F

Climate (2021–Present)

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

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  • Average Low 2021–2026

    47.7 °F

  • Average 2021–2026

    57.7 °F

  • Average High 2021–2026

    68 °F
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