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.

Overcast

35°F

2°C

Humidity 64%
Wind Speed NW 12 G 24 mph
Barometer 30.00 in (1016.1 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 10 Dec 4:53 pm CST
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 26. Northwest wind 6 to 13 mph, with gusts as high as 21 mph.

    Low: 26 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of snow after 4pm. Mostly cloudy, with a high near 34. Light and variable wind becoming southeast 5 to 8 mph in the morning.

    High: 34 °F

    Partly Sunny
    then Slight
    Chance Snow

  • Thursday Night

    Thursday Night: A slight chance of snow before 10pm, then a slight chance of rain between 10pm and midnight. Mostly cloudy, with a low around 33. Southeast wind 6 to 8 mph becoming northwest after midnight. Chance of precipitation is 20%.

    Low: 33 °F

    Slight Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Friday

    Friday: Partly sunny, with a high near 40. Northwest wind 7 to 11 mph.

    High: 40 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 21. Northwest wind 6 to 8 mph.

    Low: 21 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 30 percent chance of snow, mainly after noon. Mostly cloudy, with a high near 28.

    High: 28 °F

    Chance Snow

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 5.

    Low: 5 °F

    Mostly Cloudy

  • Sunday

    Sunday: Sunny and cold, with a high near 19.

    High: 19 °F

    Cold

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 9.

    Low: 9 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 26. Northwest wind 6 to 13 mph, with gusts as high as 21 mph.
Thursday
A 20 percent chance of snow after 4pm. Mostly cloudy, with a high near 34. Light and variable wind becoming southeast 5 to 8 mph in the morning.
Thursday Night
A slight chance of snow before 10pm, then a slight chance of rain between 10pm and midnight. Mostly cloudy, with a low around 33. Southeast wind 6 to 8 mph becoming northwest after midnight. Chance of precipitation is 20%.
Friday
Partly sunny, with a high near 40. Northwest wind 7 to 11 mph.
Friday Night
Mostly cloudy, with a low around 21. Northwest wind 6 to 8 mph.
Saturday
A 30 percent chance of snow, mainly after noon. Mostly cloudy, with a high near 28.
Saturday Night
Mostly cloudy, with a low around 5.
Sunday
Sunny and cold, with a high near 19.
Sunday Night
Mostly clear, with a low around 9.
Monday
Sunny, with a high near 40.
Monday Night
Mostly cloudy, with a low around 27.
Tuesday
Partly sunny, with a high near 45.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
Mostly cloudy, with a high near 52.
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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:
4:57 pm CST Dec 10, 2025
Forecast Valid:
5pm CST Dec 10, 2025-6pm CST Dec 17, 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