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.

A Few Clouds and Breezy

24°F

-4°C

Humidity 52%
Wind Speed NW 24 G 31 mph
Barometer 30.48 in (1032.6 mb)
Dewpoint 9°F (-13°C)
Visibility 10.00 mi
Wind Chill8°F (-13°C)
Last update 22 Feb 9:53 am CST
Extended Forecast for

Granite City IL

  • Today

    Today: Sunny, with a high near 30. Blustery, with a northwest wind 20 to 22 mph, with gusts as high as 32 mph.

    High: 30 °F

    Sunny and
    Blustery

  • Tonight

    Tonight: Increasing clouds, with a low around 15. Northwest wind 14 to 17 mph, with gusts as high as 29 mph.

    Low: 15 °F

    Increasing
    Clouds

  • Monday

    Monday: Sunny, with a high near 34. Northwest wind 8 to 15 mph, with gusts as high as 25 mph.

    High: 34 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 20. Calm wind becoming south 5 to 8 mph after midnight.

    Low: 20 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 54. South wind 9 to 15 mph, with gusts as high as 24 mph.

    High: 54 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 57.

    High: 57 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 39.

    Low: 39 °F

    Chance Rain

  • Thursday

    Thursday: A 30 percent chance of rain before noon. Mostly sunny, with a high near 52.

    High: 52 °F

    Chance Rain
    then Mostly
    Sunny

Detailed Forecast

Today
Sunny, with a high near 30. Blustery, with a northwest wind 20 to 22 mph, with gusts as high as 32 mph.
Tonight
Increasing clouds, with a low around 15. Northwest wind 14 to 17 mph, with gusts as high as 29 mph.
Monday
Sunny, with a high near 34. Northwest wind 8 to 15 mph, with gusts as high as 25 mph.
Monday Night
Increasing clouds, with a low around 20. Calm wind becoming south 5 to 8 mph after midnight.
Tuesday
Mostly cloudy, with a high near 54. South wind 9 to 15 mph, with gusts as high as 24 mph.
Tuesday Night
Mostly cloudy, with a low around 37.
Wednesday
Partly sunny, with a high near 57.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 39.
Thursday
A 30 percent chance of rain before noon. Mostly sunny, with a high near 52.
Thursday Night
Mostly clear, with a low around 31.
Friday
Sunny, with a high near 63.
Friday Night
Mostly clear, with a low around 41.
Saturday
A 20 percent chance of rain. Mostly sunny, with a high near 63.
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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:
7:56 am CST Feb 22, 2026
Forecast Valid:
10am CST Feb 22, 2026-6pm CST Feb 28, 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