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.

Partly Cloudy

76°F

24°C

Humidity 60%
Wind Speed S 10 mph
Barometer 29.93 in (1013.1 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 3 Apr 8:53 pm CDT
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3am. Low around 55. South wind 11 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.

    Low: 55 °F

    Chance
    T-storms then
    T-storms

  • Saturday

    Saturday: Showers and possibly a thunderstorm before 11am, then a slight chance of showers between 11am and 1pm. Temperature falling to around 55 by noon. West wind 8 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 80%.

    High: 62 °F⇓

    Showers then
    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, then gradually becoming clear, with a low around 40. Northwest wind 8 to 15 mph, with gusts as high as 23 mph.

    Low: 40 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 60. Northwest wind 7 to 10 mph, with gusts as high as 20 mph.

    High: 60 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 41. West wind 3 to 6 mph.

    Low: 41 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 63.

    High: 63 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 56.

    High: 56 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 41.

    Low: 41 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3am. Low around 55. South wind 11 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
Saturday
Showers and possibly a thunderstorm before 11am, then a slight chance of showers between 11am and 1pm. Temperature falling to around 55 by noon. West wind 8 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 80%.
Saturday Night
Mostly cloudy, then gradually becoming clear, with a low around 40. Northwest wind 8 to 15 mph, with gusts as high as 23 mph.
Sunday
Sunny, with a high near 60. Northwest wind 7 to 10 mph, with gusts as high as 20 mph.
Sunday Night
Clear, with a low around 41. West wind 3 to 6 mph.
Monday
Sunny, with a high near 63.
Monday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 38.
Tuesday
Mostly cloudy, with a high near 56.
Tuesday Night
Mostly cloudy, with a low around 41.
Wednesday
Partly sunny, with a high near 73.
Wednesday Night
Mostly clear, with a low around 55.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 77.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 56.
Friday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 78.
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:
8:06 pm CDT Apr 3, 2026
Forecast Valid:
9pm CDT Apr 3, 2026-6pm CDT Apr 10, 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