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

31°F

-1°C

Humidity 38%
Wind Speed NW 20 G 28 mph
Barometer 30.47 in (1032.2 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 22 Feb 5:53 pm CST
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Increasing clouds, with a low around 15. Northwest wind 15 to 17 mph, with gusts as high as 30 mph.

    Low: 15 °F

    Increasing
    Clouds

  • Monday

    Monday: Sunny, with a high near 32. Northwest wind 8 to 16 mph, with gusts as high as 24 mph.

    High: 32 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 21. Calm wind becoming south 5 to 9 mph after midnight.

    Low: 21 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 53. South wind 10 to 16 mph, with gusts as high as 25 mph.

    High: 53 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 35. Southwest wind 5 to 10 mph becoming light and variable after midnight.

    Low: 35 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 55.

    High: 55 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A chance of rain, then rain likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 37. Chance of precipitation is 60%.

    Low: 37 °F

    Rain Likely

  • Thursday

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

    High: 52 °F

    Chance Rain
    then Sunny

  • Thursday Night

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

    Low: 30 °F

    Mostly Clear

Detailed Forecast

Tonight
Increasing clouds, with a low around 15. Northwest wind 15 to 17 mph, with gusts as high as 30 mph.
Monday
Sunny, with a high near 32. Northwest wind 8 to 16 mph, with gusts as high as 24 mph.
Monday Night
Mostly clear, with a low around 21. Calm wind becoming south 5 to 9 mph after midnight.
Tuesday
Mostly cloudy, with a high near 53. South wind 10 to 16 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly cloudy, with a low around 35. Southwest wind 5 to 10 mph becoming light and variable after midnight.
Wednesday
Mostly sunny, with a high near 55.
Wednesday Night
A chance of rain, then rain likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 37. Chance of precipitation is 60%.
Thursday
A 30 percent chance of rain before noon. Mostly sunny, with a high near 52.
Thursday Night
Mostly clear, with a low around 30.
Friday
Sunny, with a high near 64.
Friday Night
Mostly clear, with a low around 39.
Saturday
Sunny, with a high near 64.
Saturday Night
Partly cloudy, with a low around 33.
Sunday
A 20 percent chance of rain. Partly sunny, with a high near 50.
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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:
3:11 pm CST Feb 22, 2026
Forecast Valid:
6pm CST Feb 22, 2026-6pm CST Mar 1, 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