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

37°F

3°C

Humidity 65%
Wind Speed S 12 G 21 mph
Barometer 30.01 in (1016.6 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 9 Dec 4:53 am CST
Extended Forecast for

Granite City IL

  • Today

    Today: Mostly cloudy, then gradually becoming sunny, with a high near 52. South wind 9 to 14 mph, with gusts as high as 22 mph.

    High: 52 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: A slight chance of rain between midnight and 2am. Cloudy, then gradually becoming partly cloudy, with a steady temperature around 46. South wind 14 to 17 mph becoming west after midnight. Winds could gust as high as 33 mph. Chance of precipitation is 20%.

    Low: 46 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Wednesday

    Wednesday: Increasing clouds, with a temperature falling to around 37 by 1pm. Breezy, with a northwest wind 14 to 24 mph, with gusts as high as 38 mph.

    High: 45 °F⇓

    Increasing
    Clouds and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 27. Northwest wind 5 to 10 mph becoming light after midnight.

    Low: 27 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 40. Light and variable wind becoming southwest around 6 mph in the morning.

    High: 40 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 30.

    Low: 30 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 18.

    Low: 18 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 28.

    High: 28 °F

    Partly Sunny

Detailed Forecast

Today
Mostly cloudy, then gradually becoming sunny, with a high near 52. South wind 9 to 14 mph, with gusts as high as 22 mph.
Tonight
A slight chance of rain between midnight and 2am. Cloudy, then gradually becoming partly cloudy, with a steady temperature around 46. South wind 14 to 17 mph becoming west after midnight. Winds could gust as high as 33 mph. Chance of precipitation is 20%.
Wednesday
Increasing clouds, with a temperature falling to around 37 by 1pm. Breezy, with a northwest wind 14 to 24 mph, with gusts as high as 38 mph.
Wednesday Night
Mostly cloudy, with a low around 27. Northwest wind 5 to 10 mph becoming light after midnight.
Thursday
Mostly cloudy, with a high near 40. Light and variable wind becoming southwest around 6 mph in the morning.
Thursday Night
Mostly cloudy, with a low around 30.
Friday
Partly sunny, with a high near 42.
Friday Night
Mostly cloudy, with a low around 18.
Saturday
Partly sunny, with a high near 28.
Saturday Night
Mostly cloudy, with a low around 10.
Sunday
Mostly sunny, with a high near 24.
Sunday Night
Partly cloudy, with a low around 15.
Monday
A chance of rain and snow. Partly sunny, with a high near 37. Chance of precipitation is 30%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.73°N 90.11°W (Elev. 417 ft)
Last Update:
4:01 am CST Dec 9, 2025
Forecast Valid:
5am CST Dec 9, 2025-6pm CST Dec 15, 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