National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
7-Day Forecast 38.68°N 90°W (Text-Only)
NWS Forecast for: Collinsville IL
Issued by: National Weather Service Saint Louis, MO
Last Update: 10:52 pm CDT Jul 12, 2025		Print

  • Overnight

    Overnight: Partly cloudy, with a low around 22. Calm wind.

    Low: 22 °C

    Partly Cloudy



  • Sunday

    Sunday: A 50 percent chance of showers and thunderstorms, mainly after noon. Mostly cloudy, with a high near 31. Calm wind.

    High: 31 °C

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Sunday
    Night

    Sunday Night: Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 22. Calm wind.

    Low: 22 °C

    Mostly Cloudy
    then Patchy
    Fog

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 32. Calm wind becoming south 5 to 10 km/h in the morning.

    High: 32 °C

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Monday
    Night

    Monday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 23. Southeast wind 3 to 8 km/h.

    Low: 23 °C

    Slight Chance
    T-storms


  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 32.

    High: 32 °C

    Partly Sunny
    then Chance
    T-storms

  • Tuesday
    Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 23.

    Low: 23 °C

    Slight Chance
    T-storms


  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 34.

    High: 34 °C

    Chance
    T-storms


  • Wednesday
    Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 23.

    Low: 23 °C

    Chance
    T-storms




    • Overnight: Partly cloudy, with a low around 22. Calm wind.

    Sunday: A 50 percent chance of showers and thunderstorms, mainly after noon. Mostly cloudy, with a high near 31. Calm wind.

    Sunday Night: Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 22. Calm wind.

    Monday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 32. Calm wind becoming south 5 to 10 km/h in the morning.

    Monday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 23. Southeast wind 3 to 8 km/h.

    Tuesday: A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 32.

    Tuesday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 23.

    Wednesday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 34.

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 23.

    Thursday: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 33.

    Thursday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 22.

    Friday: A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 31.

    Friday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 22.

    Saturday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 32.


    Collinsville IL
     38.68°N 90°W (Elev. 499 m)

    Visit your local NWS office at: https://www.weather.gov/lsx/