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.

Overcast

58°F

14°C

Humidity 75%
Wind Speed S 13 G 26 mph
Barometer 29.65 in (1004.1 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 17 Feb 8:53 pm CST
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: A slight chance of showers between midnight and 3am. Cloudy, then gradually becoming partly cloudy, with a low around 52. Breezy, with a south wind 14 to 20 mph, with gusts as high as 31 mph. Chance of precipitation is 20%.

    Low: 52 °F

    Cloudy and
    Breezy then
    Slight Chance
    Showers

  • Wednesday

    Wednesday: Partly sunny, then gradually becoming sunny, with a high near 73. Southwest wind 6 to 13 mph, with gusts as high as 22 mph.

    High: 73 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 50. South wind 3 to 6 mph.

    Low: 50 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 72. South wind 6 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 40%.

    High: 72 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 38. West wind 10 to 15 mph, with gusts as high as 24 mph.

    Low: 38 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 51.

    High: 51 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

  • Saturday

    Saturday: A 40 percent chance of snow, mainly after noon. Mostly sunny, with a high near 44.

    High: 44 °F

    Chance Snow

  • Saturday Night

    Saturday Night: A 30 percent chance of snow, mainly before midnight. Partly cloudy, with a low around 27.

    Low: 27 °F

    Chance Snow

Detailed Forecast

Tonight
A slight chance of showers between midnight and 3am. Cloudy, then gradually becoming partly cloudy, with a low around 52. Breezy, with a south wind 14 to 20 mph, with gusts as high as 31 mph. Chance of precipitation is 20%.
Wednesday
Partly sunny, then gradually becoming sunny, with a high near 73. Southwest wind 6 to 13 mph, with gusts as high as 22 mph.
Wednesday Night
Partly cloudy, with a low around 50. South wind 3 to 6 mph.
Thursday
A chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 72. South wind 6 to 14 mph becoming southwest in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 40%.
Thursday Night
Mostly clear, with a low around 38. West wind 10 to 15 mph, with gusts as high as 24 mph.
Friday
Sunny, with a high near 51.
Friday Night
Partly cloudy, with a low around 31.
Saturday
A 40 percent chance of snow, mainly after noon. Mostly sunny, with a high near 44.
Saturday Night
A 30 percent chance of snow, mainly before midnight. Partly cloudy, with a low around 27.
Sunday
A 20 percent chance of snow before noon. Sunny, with a high near 38.
Sunday Night
Mostly clear, with a low around 20.
Monday
Sunny, with a high near 39.
Monday Night
Partly cloudy, with a low around 22.
Tuesday
Mostly sunny, with a high near 48.
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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:
8:01 pm CST Feb 17, 2026
Forecast Valid:
8pm CST Feb 17, 2026-6pm CST Feb 24, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation