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

53°F

12°C

Humidity 80%
Wind Speed E 6 mph
Barometer 30.33 in (1026.8 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Wind Chill51°F (11°C)
Last update 11 Apr 1:53 am CDT
Extended Forecast for

Granite City IL

  • Overnight

    Overnight: Mostly clear, with a low around 51. East wind around 6 mph.

    Low: 51 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of showers after 4pm. Partly sunny, with a high near 73. Southeast wind 7 to 9 mph.

    High: 73 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before 8pm. Partly cloudy, with a low around 61. Southeast wind around 8 mph.

    Low: 61 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Sunday

    Sunday: A slight chance of showers and thunderstorms between 1pm and 4pm, then a slight chance of showers after 4pm. Increasing clouds, with a high near 83. South wind 8 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 20%.

    High: 83 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers before 7pm, then a chance of showers and thunderstorms between 7pm and 1am, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 67. Southwest wind 11 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    Low: 67 °F

    Chance
    T-storms then
    Showers
    Likely

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms, mainly between 10am and 1pm. Mostly sunny, with a high near 86.

    High: 86 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70.

    Low: 70 °F

    Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a low around 51. East wind around 6 mph.
Saturday
A 20 percent chance of showers after 4pm. Partly sunny, with a high near 73. Southeast wind 7 to 9 mph.
Saturday Night
A 20 percent chance of showers before 8pm. Partly cloudy, with a low around 61. Southeast wind around 8 mph.
Sunday
A slight chance of showers and thunderstorms between 1pm and 4pm, then a slight chance of showers after 4pm. Increasing clouds, with a high near 83. South wind 8 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 20%.
Sunday Night
A chance of showers before 7pm, then a chance of showers and thunderstorms between 7pm and 1am, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 67. Southwest wind 11 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Monday
A 30 percent chance of showers and thunderstorms, mainly between 10am and 1pm. Mostly sunny, with a high near 86.
Monday Night
Partly cloudy, with a low around 69.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70.
Wednesday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 85. Chance of precipitation is 60%.
Wednesday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.
Thursday
Showers and thunderstorms likely. Partly sunny, with a high near 80. Chance of precipitation is 60%.
Thursday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 62.
Friday
A 40 percent chance of showers and thunderstorms. Mostly 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
 38.73°N 90.11°W (Elev. 417 ft)
Last Update:
1:26 am CDT Apr 11, 2026
Forecast Valid:
2am CDT Apr 11, 2026-6pm CDT Apr 17, 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