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

22°F

-6°C

Humidity 89%
Wind Speed SE 7 mph
Barometer 30.10 in (1019.6 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill13°F (-11°C)
Last update 2 Dec 9:53 pm CST
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 19. South wind around 5 mph.

    Low: 19 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of snow, mainly after 5pm. Increasing clouds, with a high near 40. South wind around 6 mph becoming northwest in the afternoon.

    High: 40 °F

    Partly Sunny
    then Chance
    Snow

  • Wednesday Night

    Wednesday Night: A 50 percent chance of snow, mainly before midnight. Cloudy, with a low around 15. North wind 6 to 10 mph.

    Low: 15 °F

    Chance Snow
    then Slight
    Chance Snow

  • Thursday

    Thursday: Mostly sunny, with a high near 23. North wind 3 to 8 mph.

    High: 23 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 12. Calm wind.

    Low: 12 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 38.

    High: 38 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 23.

    Low: 23 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 37.

    High: 37 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 25.

    Low: 25 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 19. South wind around 5 mph.
Wednesday
A 30 percent chance of snow, mainly after 5pm. Increasing clouds, with a high near 40. South wind around 6 mph becoming northwest in the afternoon.
Wednesday Night
A 50 percent chance of snow, mainly before midnight. Cloudy, with a low around 15. North wind 6 to 10 mph.
Thursday
Mostly sunny, with a high near 23. North wind 3 to 8 mph.
Thursday Night
Partly cloudy, with a low around 12. Calm wind.
Friday
Mostly sunny, with a high near 38.
Friday Night
Partly cloudy, with a low around 23.
Saturday
Partly sunny, with a high near 37.
Saturday Night
Mostly cloudy, with a low around 25.
Sunday
A slight chance of snow before noon, then a slight chance of rain and snow. Mostly cloudy, with a high near 35. Chance of precipitation is 20%.
Sunday Night
Mostly cloudy, with a low around 20.
Monday
Partly sunny, with a high near 35.
Monday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 26.
Tuesday
Partly sunny, with a high near 41.
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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:
9:56 pm CST Dec 2, 2025
Forecast Valid:
11pm CST Dec 2, 2025-6pm CST Dec 9, 2025
 
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