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.

Fair

89°F

32°C

Humidity 17%
Wind Speed NW 13 mph
Barometer 29.83 in (1009.7 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 20 Mar 3:53 pm CDT
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Partly cloudy, with a low around 52. West wind 5 to 8 mph becoming calm after midnight.

    Low: 52 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 82. Calm wind becoming southwest 5 to 7 mph in the morning.

    High: 82 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 63. South wind 6 to 8 mph.

    Low: 63 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 87. South wind 8 to 14 mph becoming northwest in the afternoon.

    High: 87 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 41. North wind 11 to 17 mph, with gusts as high as 28 mph.

    Low: 41 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 58.

    High: 58 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 41.

    Low: 41 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 61.

    High: 61 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain and thunderstorms after 1am. Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 52. West wind 5 to 8 mph becoming calm after midnight.
Saturday
Sunny, with a high near 82. Calm wind becoming southwest 5 to 7 mph in the morning.
Saturday Night
Mostly clear, with a low around 63. South wind 6 to 8 mph.
Sunday
Mostly sunny, with a high near 87. South wind 8 to 14 mph becoming northwest in the afternoon.
Sunday Night
Partly cloudy, with a low around 41. North wind 11 to 17 mph, with gusts as high as 28 mph.
Monday
Sunny, with a high near 58.
Monday Night
Partly cloudy, with a low around 41.
Tuesday
Partly sunny, with a high near 61.
Tuesday Night
A 20 percent chance of rain and thunderstorms after 1am. Partly cloudy, with a low around 44.
Wednesday
Mostly cloudy, with a high near 68.
Wednesday Night
Partly cloudy, with a low around 52.
Thursday
A 20 percent chance of rain. Sunny, with a high near 80.
Thursday Night
A 40 percent chance of rain. Partly cloudy, with a low around 42.
Friday
A 30 percent chance of rain. Mostly cloudy, with a high near 54.
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:
1:56 pm CDT Mar 20, 2026
Forecast Valid:
4pm CDT Mar 20, 2026-6pm CDT Mar 27, 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