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

33°F

1°C

Humidity 35%
Wind Speed S 10 mph
Barometer 30.24 in (1024.6 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Wind Chill25°F (-4°C)
Last update 20 Jan 5:53 pm CST
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Increasing clouds, with a low around 29. South wind 9 to 13 mph, with gusts as high as 22 mph.

    Low: 29 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 43. West wind 9 to 13 mph, with gusts as high as 20 mph.

    High: 43 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 24. Southwest wind 6 to 10 mph becoming northwest after midnight. Winds could gust as high as 22 mph.

    Low: 24 °F

    Mostly Clear

  • Thursday

    Thursday: Partly sunny, with a high near 38. Northwest wind 3 to 6 mph.

    High: 38 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 10. Light north wind increasing to 8 to 13 mph after midnight. Winds could gust as high as 21 mph.

    Low: 10 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy and cold, with a high near 16.

    High: 16 °F

    Cold

  • Friday Night

    Friday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 3.

    Low: 3 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Saturday

    Saturday: A 40 percent chance of snow, mainly after noon. Cloudy and cold, with a high near 15.

    High: 15 °F

    Chance Snow

  • Saturday Night

    Saturday Night: A 40 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 9.

    Low: 9 °F

    Chance Snow

Detailed Forecast

Tonight
Increasing clouds, with a low around 29. South wind 9 to 13 mph, with gusts as high as 22 mph.
Wednesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 43. West wind 9 to 13 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 24. Southwest wind 6 to 10 mph becoming northwest after midnight. Winds could gust as high as 22 mph.
Thursday
Partly sunny, with a high near 38. Northwest wind 3 to 6 mph.
Thursday Night
Mostly cloudy, with a low around 10. Light north wind increasing to 8 to 13 mph after midnight. Winds could gust as high as 21 mph.
Friday
Mostly cloudy and cold, with a high near 16.
Friday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 3.
Saturday
A 40 percent chance of snow, mainly after noon. Cloudy and cold, with a high near 15.
Saturday Night
A 40 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 9.
Sunday
Partly sunny, with a high near 22.
Sunday Night
Partly cloudy, with a low around 7.
Monday
Mostly sunny, with a high near 26.
Monday Night
Mostly clear, with a low around 11.
Tuesday
Mostly sunny, with a high near 37.
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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:
7:01 pm CST Jan 20, 2026
Forecast Valid:
7pm CST Jan 20, 2026-6pm CST Jan 27, 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