Collinsville Weather Forecast

    • 22
    • 67

    Rain

    • 14
    • 30

    Blustery

    • 31
    • 36

    Chance Snow

    • 43
    • 63

    Partly Sunny

    • 45
    • 70

    Mostly Sunny

    • 49
    • 75

    Mostly Cloudy

Today 15 Mar Madison

Partly sunny with a chance of rain and Thunderstorms this Morning, then mostly cloudy with rain with a slight chance of Thunderstorms this afternoon. Windy with Highs in the upper 60s. Temperature falling to around 60 this afternoon. South Winds 20 to 30 Mph with Gusts up to 45 Mph. Chance of rain 90 percent.

Tonight 15 Mar Madison

Mostly cloudy. Rain, a slight chance of Thunderstorms and snow in the Evening, then a chance of snow after midnight. Little or no snow accumulation. Windy and much cooler with Lows in the lower 20s. West Winds 20 to 30 Mph with Gusts up to 50 Mph. Chance of precipitation 90 percent.

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Collinsville Temperature Statistics

March Temperature

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

  • Lowest 1 March, 2026

    30 °F

  • Average March

    52.8 °F

  • Highest 10 March, 2026

    84.9 °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

    57.6 °F

  • Average High 2021–2026

    67.8 °F
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