Collinsville Weather Forecast

    • 64
    • 93

    Mostly Sunny

    • 64
    • 93

    Mostly Sunny

    • 67
    • 94

    Chance Rain Showers

    • 64
    • 87

    Chance Thunderstorms

    • 65
    • 86

    Chance Rain Showers

    • 64
    • 83

    Chance Rain Showers

Today 16 Sep Madison

Sunny. Highs in the lower 90s. Northeast Winds around 5 Mph.

Tonight 16 Sep Madison

Mostly clear. Lows in the mid 60s. Northeast Winds around 5 Mph.

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 8 September, 2025

    44.6 °F

  • Average September

    69.6 °F

  • Highest 13 September, 2025

    95.5 °F

Climate (2020–Present)

Belleville, Scott AFB/MidAmerica Airport (10.6 miles)

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

  • Average Low 2020–2025

    47.3 °F

  • Average 2020–2025

    57.2 °F

  • Average High 2020–2025

    67.4 °F
Get WillyWeather+ to remove ads