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

43°F

6°C

Humidity 37%
Wind Speed S 8 mph
Barometer 29.92 in (1013.6 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 5 Dec 2:53 pm CST
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 28. South wind 5 to 7 mph becoming west after midnight.

    Low: 28 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 39. Calm wind becoming east around 5 mph in the afternoon.

    High: 39 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A chance of snow between midnight and 3am, then a chance of rain after 3am. Mostly cloudy, with a low around 31. Southeast wind around 6 mph. Chance of precipitation is 40%.

    Low: 31 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Sunday

    Sunday: A chance of rain, mixing with snow after 9am, then gradually ending. Mostly cloudy, with a high near 39. Southeast wind 6 to 13 mph becoming northwest in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 30%.

    High: 39 °F

    Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 14. North wind 5 to 10 mph becoming light after midnight.

    Low: 14 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 31.

    High: 31 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 23.

    Low: 23 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 46.

    High: 46 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 28. South wind 5 to 7 mph becoming west after midnight.
Saturday
Partly sunny, with a high near 39. Calm wind becoming east around 5 mph in the afternoon.
Saturday Night
A chance of snow between midnight and 3am, then a chance of rain after 3am. Mostly cloudy, with a low around 31. Southeast wind around 6 mph. Chance of precipitation is 40%.
Sunday
A chance of rain, mixing with snow after 9am, then gradually ending. Mostly cloudy, with a high near 39. Southeast wind 6 to 13 mph becoming northwest in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 30%.
Sunday Night
Mostly cloudy, with a low around 14. North wind 5 to 10 mph becoming light after midnight.
Monday
Mostly sunny, with a high near 31.
Monday Night
Partly cloudy, with a low around 23.
Tuesday
Mostly sunny, with a high near 46.
Tuesday Night
Mostly cloudy, with a low around 36.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 47.
Wednesday Night
Mostly cloudy, with a low around 22.
Thursday
Mostly cloudy, with a high near 34.
Thursday Night
Mostly cloudy, with a low around 21.
Friday
Mostly sunny, with a high near 31.
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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:
1:56 pm CST Dec 5, 2025
Forecast Valid:
3pm CST Dec 5, 2025-6pm CST Dec 12, 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