National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

24°C

76°F

Humidity 85%
Wind Speed S 6 km/h
Barometer 1015.4 mb (30.00 in)
Dewpoint 22°C (71°F)
Visibility 16 km
Heat Index25°C (77°F)
Last update 12 Jul 9:53 pm CDT
Extended Forecast for

Collinsville IL

  • Tonight

    Tonight: 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

Detailed Forecast

Tonight
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.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Collinsville IL
 38.68°N 90°W (Elev. 499 m)
Last Update:
8:37 pm CDT Jul 12, 2025
Forecast Valid:
10pm CDT Jul 12, 2025-6pm CDT Jul 19, 2025
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation