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

59°F

15°C

Humidity 36%
Wind Speed NW 15 mph
Barometer 30.28 in (1025.2 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Last update 5 Apr 4:53 pm CDT
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Clear, with a low around 43. Northwest wind 6 to 11 mph becoming light and variable.

    Low: 43 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 62. Northwest wind 7 to 10 mph, with gusts as high as 20 mph.

    High: 62 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers after 1am. Increasing clouds, with a low around 39. Northeast wind 7 to 10 mph, with gusts as high as 21 mph.

    Low: 39 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Tuesday

    Tuesday: Cloudy, then gradually becoming mostly sunny, with a high near 55. East wind 7 to 10 mph.

    High: 55 °F

    Decreasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41. Southeast wind around 8 mph.

    Low: 41 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 74. Chance of precipitation is 30%.

    High: 74 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms, then a chance of showers after 1am. Mostly cloudy, with a low around 58. Chance of precipitation is 30%.

    Low: 58 °F

    Slight Chance
    T-storms then
    Chance
    Showers

Detailed Forecast

Tonight
Clear, with a low around 43. Northwest wind 6 to 11 mph becoming light and variable.
Monday
Sunny, with a high near 62. Northwest wind 7 to 10 mph, with gusts as high as 20 mph.
Monday Night
A 20 percent chance of showers after 1am. Increasing clouds, with a low around 39. Northeast wind 7 to 10 mph, with gusts as high as 21 mph.
Tuesday
Cloudy, then gradually becoming mostly sunny, with a high near 55. East wind 7 to 10 mph.
Tuesday Night
Mostly cloudy, with a low around 41. Southeast wind around 8 mph.
Wednesday
Mostly sunny, with a high near 74.
Wednesday Night
Partly cloudy, with a low around 55.
Thursday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 74. Chance of precipitation is 30%.
Thursday Night
A slight chance of showers and thunderstorms, then a chance of showers after 1am. Mostly cloudy, with a low around 58. Chance of precipitation is 30%.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 77. Chance of precipitation is 40%.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 57.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 81.
Saturday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62.
Sunday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.71°N 90.14°W (Elev. 410 ft)
Last Update:
5:36 pm CDT Apr 5, 2026
Forecast Valid:
5pm CDT Apr 5, 2026-6pm CDT Apr 12, 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