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

39°F

4°C

Humidity 89%
Wind Speed S 3 mph
Barometer 29.95 in (1014.3 mb)
Dewpoint 36°F (2°C)
Visibility 8.00 mi
Last update 7 Dec 5:53 am CST
Extended Forecast for

Granite City IL

  • Today

    Today: A chance of sprinkles before 11am. Cloudy, with a high near 40. Light and variable wind becoming north 8 to 13 mph in the morning. Winds could gust as high as 22 mph.

    High: 40 °F

    Chance
    Sprinkles

  • Tonight

    Tonight: Mostly cloudy, with a low around 22. North wind 6 to 11 mph, with gusts as high as 20 mph.

    Low: 22 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 34. North wind around 5 mph becoming calm in the morning.

    High: 34 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a low around 26. Calm wind becoming south 5 to 9 mph in the evening.

    Low: 26 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 53. Southwest wind 9 to 13 mph, with gusts as high as 21 mph.

    High: 53 °F

    Mostly Sunny

  • Tuesday Night

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

    Low: 41 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 49.

    High: 49 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Thursday

    Thursday: A chance of rain and snow, mainly before noon. Mostly cloudy, with a high near 38. Chance of precipitation is 30%.

    High: 38 °F

    Chance
    Rain/Snow

Detailed Forecast

Today
A chance of sprinkles before 11am. Cloudy, with a high near 40. Light and variable wind becoming north 8 to 13 mph in the morning. Winds could gust as high as 22 mph.
Tonight
Mostly cloudy, with a low around 22. North wind 6 to 11 mph, with gusts as high as 20 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 34. North wind around 5 mph becoming calm in the morning.
Monday Night
Partly cloudy, with a low around 26. Calm wind becoming south 5 to 9 mph in the evening.
Tuesday
Mostly sunny, with a high near 53. Southwest wind 9 to 13 mph, with gusts as high as 21 mph.
Tuesday Night
Mostly cloudy, with a low around 41.
Wednesday
Partly sunny, with a high near 49.
Wednesday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 28.
Thursday
A chance of rain and snow, mainly before noon. Mostly cloudy, with a high near 38. Chance of precipitation is 30%.
Thursday Night
Mostly cloudy, with a low around 18.
Friday
Mostly sunny, with a high near 26.
Friday Night
Mostly cloudy, with a low around 6.
Saturday
Partly sunny, with a high near 22.
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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:
5:01 am CST Dec 7, 2025
Forecast Valid:
6am CST Dec 7, 2025-6pm CST Dec 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