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

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

61°F

16°C

Humidity 97%
Wind Speed SE 6 mph
Barometer 29.93 in (1013.1 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 17 Apr 1:53 am CDT
Extended Forecast for

Granite City IL

  • Overnight

    Overnight: Mostly clear, with a low around 60. South wind 3 to 5 mph.

    Low: 60 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 87. South wind 6 to 16 mph, with gusts as high as 26 mph.

    High: 87 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 11pm. Low around 49. South wind 10 to 14 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 100%.

    Low: 49 °F

    Showers
    Likely then
    Showers

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm before 7am, then a chance of showers. Cloudy through mid morning, then gradual clearing, with a high near 59. Northwest wind 14 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.

    High: 59 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 41. Northwest wind 5 to 13 mph, with gusts as high as 21 mph.

    Low: 41 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 44.

    Low: 44 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 72.

    High: 72 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 53.

    Low: 53 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 60. South wind 3 to 5 mph.
Friday
A 20 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 87. South wind 6 to 16 mph, with gusts as high as 26 mph.
Friday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 11pm. Low around 49. South wind 10 to 14 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 100%.
Saturday
Showers likely and possibly a thunderstorm before 7am, then a chance of showers. Cloudy through mid morning, then gradual clearing, with a high near 59. Northwest wind 14 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.
Saturday Night
Mostly clear, with a low around 41. Northwest wind 5 to 13 mph, with gusts as high as 21 mph.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 44.
Monday
Sunny, with a high near 72.
Monday Night
Mostly clear, with a low around 53.
Tuesday
Mostly sunny, with a high near 79.
Tuesday Night
Mostly clear, with a low around 58.
Wednesday
Sunny, with a high near 82.
Wednesday Night
Mostly clear, with a low around 60.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.73°N 90.11°W (Elev. 417 ft)
Last Update:
1:26 am CDT Apr 17, 2026
Forecast Valid:
2am CDT Apr 17, 2026-6pm CDT Apr 23, 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