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 42%
Wind Speed S 7 mph
Barometer 30.32 in (1027.1 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 12 Jan 8:53 am CST
Extended Forecast for

Granite City IL

  • Today

    Today: Sunny, with a high near 54. Southwest wind 6 to 9 mph.

    High: 54 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 34. Southwest wind around 7 mph.

    Low: 34 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 61. West wind 7 to 15 mph, with gusts as high as 26 mph.

    High: 61 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 39. West wind 7 to 9 mph.

    Low: 39 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a temperature falling to around 33 by 5pm. Breezy, with a northwest wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 43 °F⇓

    Mostly Cloudy
    then Mostly
    Cloudy and
    Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 18.

    Low: 18 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

  • Friday

    Friday: A 20 percent chance of snow showers after noon. Partly sunny, with a high near 43.

    High: 43 °F

    Partly Sunny
    then Slight
    Chance Snow
    Showers

Detailed Forecast

Today
Sunny, with a high near 54. Southwest wind 6 to 9 mph.
Tonight
Mostly clear, with a low around 34. Southwest wind around 7 mph.
Tuesday
Increasing clouds, with a high near 61. West wind 7 to 15 mph, with gusts as high as 26 mph.
Tuesday Night
A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 39. West wind 7 to 9 mph.
Wednesday
Mostly cloudy, with a temperature falling to around 33 by 5pm. Breezy, with a northwest wind 10 to 20 mph, with gusts as high as 30 mph.
Wednesday Night
Partly cloudy, with a low around 18.
Thursday
Mostly sunny, with a high near 33.
Thursday Night
Mostly cloudy, with a low around 27.
Friday
A 20 percent chance of snow showers after noon. Partly sunny, with a high near 43.
Friday Night
Mostly cloudy, with a low around 21.
Saturday
Mostly cloudy, with a high near 30.
Saturday Night
Partly cloudy, with a low around 12.
Sunday
Mostly sunny, with a high near 29.
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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:
9:36 am CST Jan 12, 2026
Forecast Valid:
9am CST Jan 12, 2026-6pm CST Jan 18, 2026
 
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