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

21°F

-6°C

Humidity 27%
Wind Speed NW 14 mph
Barometer 30.41 in (1030.4 mb)
Dewpoint -8°F (-22°C)
Visibility 10.00 mi
Wind Chill8°F (-13°C)
Last update 19 Jan 3:53 pm CST
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Mostly clear, with a low around 13. West wind around 6 mph becoming light and variable in the evening.

    Low: 13 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 38. Light south wind increasing to 6 to 11 mph in the morning.

    High: 38 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 31. South wind 10 to 13 mph, with gusts as high as 25 mph.

    Low: 31 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 45. West wind 7 to 13 mph, with gusts as high as 21 mph.

    High: 45 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 24. West wind 6 to 8 mph becoming northwest after midnight.

    Low: 24 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 38.

    High: 38 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 11.

    Low: 11 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy and cold, with a high near 18.

    High: 18 °F

    Cold

  • Friday Night

    Friday Night: A 20 percent chance of snow. Mostly cloudy, with a low around 1.

    Low: 1 °F

    Slight Chance
    Snow

Detailed Forecast

Tonight
Mostly clear, with a low around 13. West wind around 6 mph becoming light and variable in the evening.
Tuesday
Mostly sunny, with a high near 38. Light south wind increasing to 6 to 11 mph in the morning.
Tuesday Night
Increasing clouds, with a low around 31. South wind 10 to 13 mph, with gusts as high as 25 mph.
Wednesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 45. West wind 7 to 13 mph, with gusts as high as 21 mph.
Wednesday Night
Mostly clear, with a low around 24. West wind 6 to 8 mph becoming northwest after midnight.
Thursday
Mostly sunny, with a high near 38.
Thursday Night
Mostly cloudy, with a low around 11.
Friday
Mostly cloudy and cold, with a high near 18.
Friday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 1.
Saturday
A 30 percent chance of snow, mainly after noon. Mostly cloudy and cold, with a high near 14.
Saturday Night
A 30 percent chance of snow. Partly cloudy, with a low around 5.
Sunday
Mostly sunny, with a high near 23.
Sunday Night
Mostly clear, with a low around 11.
Monday
Sunny, with a high near 34.
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ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.73°N 90.11°W (Elev. 417 ft)
Last Update:
3:16 pm CST Jan 19, 2026
Forecast Valid:
6pm CST Jan 19, 2026-6pm CST Jan 26, 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