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.

Heavy Rain Fog/Mist

72°F

22°C

Humidity 94%
Wind Speed Calm
Barometer 30.01 in (1015.8 mb)
Dewpoint 70°F (21°C)
Visibility 2.50 mi
Last update 25 Jun 10:53 pm CDT
Extended Forecast for

Collinsville IL

Flood Watch June 25, 11:34pm until June 26, 07:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch June 25, 11:34pm until June 26, 07:00pm

    NOW until 7:00pm Fri

    Flood Watch

  • Tonight

    Low: 70 °F

    Showers

  • Friday

    Friday: Showers and possibly a thunderstorm, mainly before 4pm, then showers and thunderstorms likely after 4pm. High near 82. Southeast wind 8 to 11 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 90%.

    High: 82 °F

    Showers then
    T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms likely, mainly before midnight. Mostly cloudy, with a low around 69. Southwest wind 5 to 8 mph becoming light and variable after midnight. Chance of precipitation is 60%.

    Low: 69 °F

    Showers
    Likely then
    Chance
    Showers

  • Saturday

    Saturday: A slight chance of showers before 7am, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. Light and variable wind. Chance of precipitation is 30%.

    High: 85 °F

    Partly Sunny
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. Southeast wind around 6 mph.

    Low: 73 °F

    Chance
    T-storms

  • Sunday

    Sunday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 77.

    Low: 77 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

Detailed Forecast

Tonight
Showers and possibly a thunderstorm. Low around 70. Southeast wind 3 to 6 mph. Chance of precipitation is 100%.
Friday
Showers and possibly a thunderstorm, mainly before 4pm, then showers and thunderstorms likely after 4pm. High near 82. Southeast wind 8 to 11 mph becoming southwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 90%.
Friday Night
Showers and thunderstorms likely, mainly before midnight. Mostly cloudy, with a low around 69. Southwest wind 5 to 8 mph becoming light and variable after midnight. Chance of precipitation is 60%.
Saturday
A slight chance of showers before 7am, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. Light and variable wind. Chance of precipitation is 30%.
Saturday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73. Southeast wind around 6 mph.
Sunday
Sunny, with a high near 94.
Sunday Night
Mostly clear, with a low around 77.
Monday
Sunny, with a high near 96.
Monday Night
Mostly clear, with a low around 77.
Tuesday
Sunny and hot, with a high near 97.
Tuesday Night
Clear, with a low around 78.
Wednesday
Sunny and hot, with a high near 97.
Wednesday Night
Mostly clear, with a low around 78.
Thursday
Sunny, with a high near 96.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Collinsville IL
 38.66°N 90°W (Elev. 499 ft)
Last Update:
10:01 pm CDT Jun 25, 2026
Forecast Valid:
11pm CDT Jun 25, 2026-6pm CDT Jul 2, 2026
 
Forecast Discussion
 
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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