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.

Overcast

30°F

-1°C

Humidity 36%
Wind Speed NW 5 mph
Barometer 30.28 in (1026.2 mb)
Dewpoint 6°F (-14°C)
Visibility 10.00 mi
Wind Chill25°F (-4°C)
Last update 28 Jan 1:53 pm CST
Extended Forecast for

Granite City IL

  • This Afternoon

    This Afternoon: Cloudy early, then becoming mostly sunny, with a high near 30. West wind 6 to 9 mph.

    High: 30 °F

    Mostly Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 11. West wind around 5 mph becoming light and variable after midnight.

    Low: 11 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Cloudy, with a high near 23. Northeast wind 3 to 7 mph.

    High: 23 °F

    Cloudy

  • Thursday Night

    Thursday Night: A 40 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 8. Northeast wind 5 to 7 mph becoming calm.

    Low: 8 °F

    Chance Snow

  • Friday

    Friday: Partly sunny and cold, with a high near 18. North wind 5 to 10 mph.

    High: 18 °F

    Cold

  • Friday Night

    Friday Night: Partly cloudy, with a low around 1.

    Low: 1 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny and cold, with a high near 18.

    High: 18 °F

    Cold

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 2.

    Low: 2 °F

    Mostly Clear

  • Sunday

    Sunday: A 20 percent chance of snow after noon. Mostly sunny, with a high near 27.

    High: 27 °F

    Mostly Sunny
    then Slight
    Chance Snow

Detailed Forecast

This Afternoon
Cloudy early, then becoming mostly sunny, with a high near 30. West wind 6 to 9 mph.
Tonight
Increasing clouds, with a low around 11. West wind around 5 mph becoming light and variable after midnight.
Thursday
Cloudy, with a high near 23. Northeast wind 3 to 7 mph.
Thursday Night
A 40 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 8. Northeast wind 5 to 7 mph becoming calm.
Friday
Partly sunny and cold, with a high near 18. North wind 5 to 10 mph.
Friday Night
Partly cloudy, with a low around 1.
Saturday
Mostly sunny and cold, with a high near 18.
Saturday Night
Mostly clear, with a low around 2.
Sunday
A 20 percent chance of snow after noon. Mostly sunny, with a high near 27.
Sunday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 16.
Monday
Partly sunny, with a high near 34.
Monday Night
Mostly cloudy, with a low around 19.
Tuesday
A 20 percent chance of rain. Mostly cloudy, with a high near 36.
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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:
11:02 am CST Jan 28, 2026
Forecast Valid:
2pm CST Jan 28, 2026-6pm CST Feb 3, 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