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

42°F

6°C

Humidity 53%
Wind Speed NE 3 mph
Barometer 30.15 in (1021.2 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Last update 2 Feb 3:53 pm CST
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: A slight chance of snow between 4am and 5am, then a slight chance of freezing rain after 5am. Mostly cloudy, with a low around 29. Light east wind. Chance of precipitation is 20%.

    Low: 29 °F

    Mostly Cloudy
    then Slight
    Chance Wintry
    Mix

  • Tuesday

    Tuesday: A chance of snow before 10am, then a slight chance of drizzle or freezing rain between 10am and 11am. Mostly cloudy, with a high near 34. North wind 5 to 9 mph. Chance of precipitation is 30%.

    High: 34 °F

    Chance Wintry
    Mix then
    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 17. North wind around 6 mph becoming calm in the evening.

    Low: 17 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 30. Calm wind becoming north around 6 mph.

    High: 30 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 16. Calm wind.

    Low: 16 °F

    Mostly Clear

  • Thursday

    Thursday: Partly sunny, with a high near 40.

    High: 40 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 33.

    Low: 33 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 23.

    Low: 23 °F

    Mostly Clear

Detailed Forecast

Tonight
A slight chance of snow between 4am and 5am, then a slight chance of freezing rain after 5am. Mostly cloudy, with a low around 29. Light east wind. Chance of precipitation is 20%.
Tuesday
A chance of snow before 10am, then a slight chance of drizzle or freezing rain between 10am and 11am. Mostly cloudy, with a high near 34. North wind 5 to 9 mph. Chance of precipitation is 30%.
Tuesday Night
Mostly cloudy, with a low around 17. North wind around 6 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 30. Calm wind becoming north around 6 mph.
Wednesday Night
Mostly clear, with a low around 16. Calm wind.
Thursday
Partly sunny, with a high near 40.
Thursday Night
Mostly clear, with a low around 33.
Friday
Mostly sunny, with a high near 48.
Friday Night
Mostly clear, with a low around 23.
Saturday
Mostly sunny, with a high near 39.
Saturday Night
Partly cloudy, with a low around 24.
Sunday
Mostly sunny, with a high near 44.
Sunday Night
Partly cloudy, with a low around 26.
Monday
Mostly sunny, with a high near 48.
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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:
4:46 pm CST Feb 2, 2026
Forecast Valid:
4pm CST Feb 2, 2026-6pm CST Feb 9, 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