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

82°F

28°C

Humidity 53%
Wind Speed S 15 G 24 mph
Barometer 29.94 in (1013.4 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 3 Apr 3:53 pm CDT
Extended Forecast for

Collinsville IL

  • This Afternoon

    This Afternoon: A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 80. South wind around 17 mph, with gusts as high as 26 mph.

    High: 80 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Low around 57. South wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.

    Low: 57 °F

    Chance
    T-storms then
    Showers

  • Saturday

    Saturday: Showers and possibly a thunderstorm before 1pm, then a slight chance of showers between 1pm and 2pm. Temperature falling to around 56 by 5pm. West wind 10 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 80%.

    High: 62 °F⇓

    Showers then
    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 39. West wind 8 to 15 mph, with gusts as high as 25 mph.

    Low: 39 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 58. Northwest wind 8 to 13 mph, with gusts as high as 20 mph.

    High: 58 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 40.

    Low: 40 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 55.

    High: 55 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 80. South wind around 17 mph, with gusts as high as 26 mph.
Tonight
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Low around 57. South wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.
Saturday
Showers and possibly a thunderstorm before 1pm, then a slight chance of showers between 1pm and 2pm. Temperature falling to around 56 by 5pm. West wind 10 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 80%.
Saturday Night
Mostly clear, with a low around 39. West wind 8 to 15 mph, with gusts as high as 25 mph.
Sunday
Sunny, with a high near 58. Northwest wind 8 to 13 mph, with gusts as high as 20 mph.
Sunday Night
Clear, with a low around 40.
Monday
Sunny, with a high near 62.
Monday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 37.
Tuesday
Mostly cloudy, with a high near 55.
Tuesday Night
Mostly cloudy, with a low around 40.
Wednesday
Partly sunny, with a high near 71.
Wednesday Night
Mostly clear, with a low around 54.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 75.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 56.
Friday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 76.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Collinsville IL
 38.7°N 90°W (Elev. 499 ft)
Last Update:
2:26 pm CDT Apr 3, 2026
Forecast Valid:
4pm CDT Apr 3, 2026-6pm CDT Apr 10, 2026
 
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