Collinsville Weather Forecast

    • 69
    • 92

    Thunderstorms

    • 62
    • 80

    Slight Chance Rain Showers

    • 65
    • 83

    Mostly Sunny

    • 69
    • 87

    Rain Showers Likely

    • 69
    • 86

    Rain Showers

    • 64
    • 81

    Slight Chance Thunderstorms

Today 17 Jun Madison

Mostly sunny. A slight chance of Showers and Thunderstorms this afternoon. Windy, warmer with Highs in the lower 90s. South Winds 15 to 20 Mph with Gusts up to 35 Mph, becoming southwest 20 to 30 Mph with Gusts up to 45 Mph this afternoon. Chance of rain 20 percent.

Tonight 17 Jun Madison

Mostly cloudy. Showers and Thunderstorms likely in the Evening, then a chance of Thunderstorms with a slight chance of Showers after midnight. Breezy with Lows in the upper 60s. Southwest Winds 20 to 25 Mph with Gusts up to 40 Mph, becoming west 10 to 15 Mph with Gusts up to 25 Mph after midnight. Chance of rain 70 percent.

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Collinsville Temperature Statistics

June Temperature

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

  • Lowest 3 June, 2026

    55.2 °F

  • Average June

    77.1 °F

  • Highest 9 June, 2026

    92.8 °F

Climate (2021–2026)

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

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  • Average Low 2021–2026

    47.8 °F

  • Average 2021–2026

    57.8 °F

  • Average High 2021–2026

    68.1 °F
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