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.

Overcast

71°F

22°C

Humidity 96%
Wind Speed E 5 mph
Barometer 29.94 in (1013.6 mb)
Dewpoint 70°F (21°C)
Visibility 9.00 mi
Last update 26 Jun 12:53 am CDT
Extended Forecast for

Granite City IL

Flood Watch June 26, 01:13am until June 26, 07:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch June 26, 01:13am until June 26, 07:00pm

    NOW until 7:00pm Fri

    Flood Watch

  • Overnight

    Low: 70 °F

    Showers

  • Friday

    Friday: Showers and possibly a thunderstorm, mainly before 2pm, then showers and thunderstorms likely after 2pm. High near 81. Southeast wind 7 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 90%.

    High: 81 °F

    Showers then
    T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms likely, mainly before 10pm. Mostly cloudy, with a low around 68. Northwest wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 68 °F

    Showers
    Likely then
    Slight Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 85. Light and variable wind.

    High: 85 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms, mainly after 7pm. 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 95.

    High: 95 °F

    Sunny

  • Sunday Night

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

    Low: 77 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Low around 70. Calm wind becoming east around 5 mph. Chance of precipitation is 100%.
Friday
Showers and possibly a thunderstorm, mainly before 2pm, then showers and thunderstorms likely after 2pm. High near 81. Southeast wind 7 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 90%.
Friday Night
Showers and thunderstorms likely, mainly before 10pm. Mostly cloudy, with a low around 68. Northwest wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 60%.
Saturday
A 20 percent chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 85. Light and variable wind.
Saturday Night
A 40 percent chance of showers and thunderstorms, mainly after 7pm. Partly cloudy, with a low around 73. Southeast wind around 6 mph.
Sunday
Sunny, with a high near 95.
Sunday Night
Mostly clear, with a low around 77.
Monday
Sunny and hot, with a high near 97.
Monday Night
Mostly clear, with a low around 78.
Tuesday
Sunny and hot, with a high near 98.
Tuesday Night
Clear, with a low around 78.
Wednesday
Sunny and hot, with a high near 98.
Wednesday Night
Mostly clear, with a low around 78.
Thursday
Sunny and hot, with a high near 97.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.73°N 90.11°W (Elev. 417 ft)
Last Update:
11:41 pm CDT Jun 25, 2026
Forecast Valid:
1am CDT Jun 26, 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