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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Granite City IL

  • Today

    Today: A 20 percent chance of rain after 1pm. Partly sunny, with a high near 64. East wind 5 to 7 mph becoming south in the afternoon.

    High: 64 °F

    Slight Chance
    Rain

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 30. North wind 5 to 11 mph, with gusts as high as 21 mph.

    Low: 30 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Partly sunny, with a high near 47. Northeast wind 9 to 11 mph, with gusts as high as 20 mph.

    High: 47 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Snow likely, possibly mixed with rain, becoming all snow after midnight. Cloudy, with a low around 34. East wind 7 to 10 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.

    Low: 34 °F

    Rain/Snow
    Likely then
    Snow Likely

  • Monday

    Monday: A chance of rain and snow before 9am, then a chance of rain. Cloudy, with a high near 44. East wind around 10 mph. Chance of precipitation is 40%.

    High: 44 °F

    Chance
    Rain/Snow
    then Slight
    Chance Rain

  • Monday Night

    Monday Night: Rain. Low around 38. Chance of precipitation is 80%.

    Low: 38 °F

    Rain

  • Tuesday

    Tuesday: Rain and possibly a thunderstorm. High near 59. Chance of precipitation is 90%.

    High: 59 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain, with thunderstorms also possible after midnight. Low around 49. Chance of precipitation is 80%.

    Low: 49 °F

    Rain

  • Wednesday

    Wednesday: Rain likely and possibly a thunderstorm. Cloudy, with a high near 65. Chance of precipitation is 70%.

    High: 65 °F

    Rain Likely

Detailed Forecast

Today
A 20 percent chance of rain after 1pm. Partly sunny, with a high near 64. East wind 5 to 7 mph becoming south in the afternoon.
Tonight
Mostly cloudy, then gradually becoming clear, with a low around 30. North wind 5 to 11 mph, with gusts as high as 21 mph.
Sunday
Partly sunny, with a high near 47. Northeast wind 9 to 11 mph, with gusts as high as 20 mph.
Sunday Night
Snow likely, possibly mixed with rain, becoming all snow after midnight. Cloudy, with a low around 34. East wind 7 to 10 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.
Monday
A chance of rain and snow before 9am, then a chance of rain. Cloudy, with a high near 44. East wind around 10 mph. Chance of precipitation is 40%.
Monday Night
Rain. Low around 38. Chance of precipitation is 80%.
Tuesday
Rain and possibly a thunderstorm. High near 59. Chance of precipitation is 90%.
Tuesday Night
Rain, with thunderstorms also possible after midnight. Low around 49. Chance of precipitation is 80%.
Wednesday
Rain likely and possibly a thunderstorm. Cloudy, with a high near 65. Chance of precipitation is 70%.
Wednesday Night
Rain likely and possibly a thunderstorm before midnight, then a chance of rain. Mostly cloudy, with a low around 50. Chance of precipitation is 60%.
Thursday
A 50 percent chance of rain. Partly sunny, with a high near 69.
Thursday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 55.
Friday
Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 72. Chance of precipitation is 70%.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.73°N 90.11°W (Elev. 417 ft)
Last Update:
11:01 am CST Feb 28, 2026
Forecast Valid:
11am CST Feb 28, 2026-6pm CST Mar 6, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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