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

74°F

23°C

Humidity 31%
Wind Speed SE 7 mph
Barometer 30.02 in (1016.6 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 14 May 3:53 pm CDT
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: A slight chance of showers between 3am and 4am, then a chance of showers and thunderstorms after 4am. Increasing clouds, with a low around 57. Southeast wind 8 to 10 mph. Chance of precipitation is 30%.

    Low: 57 °F

    Partly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 83. Southeast wind 11 to 14 mph becoming south in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 50%.

    High: 83 °F

    Chance
    T-storms then
    Slight Chance
    Showers

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a low around 67. South wind around 9 mph.

    Low: 67 °F

    Mostly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: A chance of showers and thunderstorms before 7am, then showers likely and possibly a thunderstorm between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86. Southwest wind 9 to 11 mph. Chance of precipitation is 60%.

    High: 86 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 67. South wind 7 to 9 mph. Chance of precipitation is 30%.

    Low: 67 °F

    Chance
    Showers

  • Sunday

    Sunday: Sunny, with a high near 91.

    High: 91 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 71.

    Low: 71 °F

    Mostly Clear

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92.

    High: 92 °F

    Mostly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.

    Low: 72 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A slight chance of showers between 3am and 4am, then a chance of showers and thunderstorms after 4am. Increasing clouds, with a low around 57. Southeast wind 8 to 10 mph. Chance of precipitation is 30%.
Friday
A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 83. Southeast wind 11 to 14 mph becoming south in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 50%.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a low around 67. South wind around 9 mph.
Saturday
A chance of showers and thunderstorms before 7am, then showers likely and possibly a thunderstorm between 7am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86. Southwest wind 9 to 11 mph. Chance of precipitation is 60%.
Saturday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 67. South wind 7 to 9 mph. Chance of precipitation is 30%.
Sunday
Sunny, with a high near 91.
Sunday Night
Mostly clear, with a low around 71.
Monday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 92.
Monday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 88. Chance of precipitation is 70%.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 81.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 60.
Thursday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 80.
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ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.71°N 90.14°W (Elev. 410 ft)
Last Update:
3:01 pm CDT May 14, 2026
Forecast Valid:
4pm CDT May 14, 2026-6pm CDT May 21, 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