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

55°F

13°C

Humidity 64%
Wind Speed SE 3 mph
Barometer 29.90 in (1012.7 mb)
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 6 Nov 6:53 pm CST
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: A slight chance of rain between 2am and 4am. Increasing clouds, with a low around 54. Southeast wind 8 to 10 mph becoming southwest after midnight. Chance of precipitation is 20%.

    Low: 54 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Friday

    Friday: Mostly cloudy through mid morning, then gradual clearing, with a high near 72. West wind 9 to 11 mph, with gusts as high as 20 mph.

    High: 72 °F

    Becoming
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 44. West wind 5 to 7 mph becoming calm after midnight.

    Low: 44 °F

    Mostly Clear

  • Saturday

    Saturday: A 30 percent chance of rain after noon. Partly sunny, with a high near 67. Light and variable wind becoming west 5 to 10 mph in the afternoon.

    High: 67 °F

    Partly Sunny
    then Chance
    Rain

  • Saturday Night

    Saturday Night: A 40 percent chance of rain before midnight. Mostly cloudy, with a low around 35. Northwest wind 10 to 14 mph, with gusts as high as 22 mph.

    Low: 35 °F

    Chance Rain
    then Mostly
    Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 42.

    High: 42 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 43.

    High: 43 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 27.

    Low: 27 °F

    Mostly Clear

Detailed Forecast

Tonight
A slight chance of rain between 2am and 4am. Increasing clouds, with a low around 54. Southeast wind 8 to 10 mph becoming southwest after midnight. Chance of precipitation is 20%.
Friday
Mostly cloudy through mid morning, then gradual clearing, with a high near 72. West wind 9 to 11 mph, with gusts as high as 20 mph.
Friday Night
Mostly clear, with a low around 44. West wind 5 to 7 mph becoming calm after midnight.
Saturday
A 30 percent chance of rain after noon. Partly sunny, with a high near 67. Light and variable wind becoming west 5 to 10 mph in the afternoon.
Saturday Night
A 40 percent chance of rain before midnight. Mostly cloudy, with a low around 35. Northwest wind 10 to 14 mph, with gusts as high as 22 mph.
Sunday
Mostly sunny, with a high near 42.
Sunday Night
Partly cloudy, with a low around 25.
Monday
Sunny, with a high near 43.
Monday Night
Mostly clear, with a low around 27.
Veterans Day
Mostly sunny, with a high near 57.
Tuesday Night
Mostly clear, with a low around 43.
Wednesday
Sunny, with a high near 65.
Wednesday Night
Mostly clear, with a low around 39.
Thursday
Sunny, with a high near 63.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.73°N 90.11°W (Elev. 417 ft)
Last Update:
5:16 pm CST Nov 6, 2025
Forecast Valid:
7pm CST Nov 6, 2025-6pm CST Nov 13, 2025
 
Forecast Discussion
 
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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