National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

43°F

6°C

Humidity 37%
Wind Speed S 13 G 29 mph
Barometer 29.81 in (1009.7 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 24 Feb 11:53 am CST
Extended Forecast for

Granite City IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 55. Breezy, with a southwest wind 14 to 20 mph, with gusts as high as 31 mph.

    High: 55 °F

    Mostly Cloudy
    and Breezy

  • Tonight

    Tonight: Mostly cloudy, with a low around 36. Southwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.

    Low: 36 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 53. Calm wind becoming north around 5 mph.

    High: 53 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 36. East wind 3 to 6 mph.

    Low: 36 °F

    Slight Chance
    Rain then
    Chance Rain

  • Thursday

    Thursday: A 20 percent chance of rain before noon. Partly sunny, with a high near 52. East wind around 6 mph becoming north in the afternoon.

    High: 52 °F

    Slight Chance
    Rain then
    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 33.

    Low: 33 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 55. Breezy, with a southwest wind 14 to 20 mph, with gusts as high as 31 mph.
Tonight
Mostly cloudy, with a low around 36. Southwest wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 20 mph.
Wednesday
Partly sunny, with a high near 53. Calm wind becoming north around 5 mph.
Wednesday Night
A 50 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 36. East wind 3 to 6 mph.
Thursday
A 20 percent chance of rain before noon. Partly sunny, with a high near 52. East wind around 6 mph becoming north in the afternoon.
Thursday Night
Mostly clear, with a low around 33.
Friday
Sunny, with a high near 65.
Friday Night
Mostly clear, with a low around 41.
Saturday
Sunny, with a high near 67.
Saturday Night
Partly cloudy, with a low around 32.
Sunday
A chance of rain and snow. Partly sunny, with a high near 46. Chance of precipitation is 30%.
Sunday Night
A chance of rain and snow. Mostly cloudy, with a low around 32. Chance of precipitation is 40%.
Monday
A 40 percent chance of rain. Mostly cloudy, with a high near 50.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.71°N 90.11°W (Elev. 413 ft)
Last Update:
10:46 am CST Feb 24, 2026
Forecast Valid:
12pm CST Feb 24, 2026-6pm CST Mar 2, 2026
 
Forecast Discussion
 
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Additional Resources

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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