Collinsville Weather Forecast

    • 64
    • 82

    Rain Showers

    • 60
    • 82

    Rain Showers

    • 60
    • 86

    Rain Showers Likely

    • 42
    • 71

    Chance Rain Showers

    • 40
    • 61

    Sunny

    • 47
    • 68

    Mostly Sunny

Today 15 Apr Madison

Mostly cloudy. Scattered Showers with isolated Thunderstorms in the Morning, then numerous Showers and Thunderstorms in the afternoon. Highs in the lower 80s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.

Tonight 15 Apr Madison

Mostly cloudy with scattered Showers with isolated Thunderstorms. Near steady temperature in the lower 70s. Southwest Winds around 10 Mph with Gusts up to 20 Mph. Chance of rain 30 percent.

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  • Temperature Real-Time

Collinsville Temperature Statistics

April Temperature

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

  • Lowest 6 April, 2026

    38.8 °F

  • Average April

    61.2 °F

  • Highest 3 April, 2026

    81.3 °F

Climate (2021–Present)

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

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  • Average Low 2021–2026

    47.6 °F

  • Average 2021–2026

    57.7 °F

  • Average High 2021–2026

    68 °F
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