Collinsville Weather Forecast

    • 66
    • 87

    Sunny

    • 69
    • 87

    Partly Sunny

    • 70
    • 86

    Rain Showers Likely

    • 67
    • 81

    Chance Thunderstorms

    • 67
    • 83

    Chance Rain Showers

    • 68
    • 85

    Slight Chance Thunderstorms

Today 29 Jul Madison

Sunny. Highs in the upper 80s. Northeast Winds 5 to 10 Mph.

Tonight 29 Jul Madison

Clear. Lows in the mid 60s. Northeast Winds 5 to 10 Mph.

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Collinsville Temperature Statistics

July Temperature

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

  • Lowest 23 July, 2026

    63.1 °F

  • Average July

    80.3 °F

  • Highest 26 July, 2026

    98.8 °F

Climate (2021–2026)

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

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  • Average Low 2021–2026

    47.9 °F

  • Average 2021–2026

    57.9 °F

  • Average High 2021–2026

    68.1 °F
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