Collinsville Weather Forecast

    • 73
    • 95

    Rain Showers

    • 66
    • 82

    Rain Showers

    • 69
    • 85

    Partly Sunny

    • 70
    • 90

    Chance Rain Showers

    • 72
    • 90

    Partly Sunny

    • 72
    • 94

    Chance Rain Showers

Today 9 Sep Madison

Sunny. A chance of Showers and Thunderstorms. Highs in the mid 90s. Northwest Winds 5 to 10 Mph. Chance of rain 40 percent. Heat index Values up to 103.

Tonight 9 Sep Madison

A chance of Thunderstorms. Showers with Lows in the lower 70s. North Winds around 5 Mph. Chance of rain 90 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Collinsville Temperature Statistics

September Temperature

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

  • Lowest 7 September, 2026

    63.7 °F

  • Average September

    84.2 °F

  • Highest 5 September, 2026

    101.8 °F

Climate (2021–2026)

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    48 °F

  • Average 2021–2026

    58 °F

  • Average High 2021–2026

    68.2 °F
Get WillyWeather+ to remove ads