Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

13°F

-11°C

Humidity 51%
Wind Speed W 3 mph
Barometer 30.42 in (1031.0 mb)
Dewpoint -2°F (-19°C)
Visibility 10.00 mi
Last update 19 Jan 8:53 pm CST
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Mostly clear, with a low around 13. Light west wind.

    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. Light west wind.
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)
9:31 pm CST Jan 19, 2026
9pm CST Jan 19, 2026-6pm CST Jan 26, 2026
 
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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