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

71°F

22°C

Humidity 20%
Wind Speed W 7 mph
Barometer 29.84 in (1010.4 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 27 Feb 5:53 pm CST
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Clear, with a low around 38. Southwest wind 5 to 7 mph becoming light and variable.

    Low: 38 °F

    Clear

  • Saturday

    Saturday: A slight chance of rain between 3pm and 5pm. Mostly sunny, with a high near 66. Northeast wind 5 to 9 mph becoming south in the afternoon. Chance of precipitation is 20%.

    High: 66 °F

    Sunny then
    Slight Chance
    Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 31. South wind 6 to 11 mph becoming north in the evening. Winds could gust as high as 21 mph.

    Low: 31 °F

    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of rain after noon. Increasing clouds, with a high near 47. Northeast wind around 10 mph.

    High: 47 °F

    Partly Sunny
    then Slight
    Chance Rain

  • Sunday Night

    Sunday Night: Rain and snow. Low around 33. East wind around 10 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

    Low: 33 °F

    Rain/Snow

  • Monday

    Monday: A chance of rain and snow before noon, then a slight chance of rain. Cloudy, with a high near 45. Chance of precipitation is 40%.

    High: 45 °F

    Chance
    Rain/Snow
    then Slight
    Chance Rain

  • Monday Night

    Monday Night: Rain likely, mainly after midnight. Cloudy, with a low around 38. Chance of precipitation is 60%.

    Low: 38 °F

    Rain Likely

  • Tuesday

    Tuesday: Rain and possibly a thunderstorm. High near 59. Chance of precipitation is 80%.

    High: 59 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain likely and possibly a thunderstorm. Cloudy, with a low around 48. Chance of precipitation is 70%.

    Low: 48 °F

    Rain Likely

Detailed Forecast

Tonight
Clear, with a low around 38. Southwest wind 5 to 7 mph becoming light and variable.
Saturday
A slight chance of rain between 3pm and 5pm. Mostly sunny, with a high near 66. Northeast wind 5 to 9 mph becoming south in the afternoon. Chance of precipitation is 20%.
Saturday Night
Partly cloudy, with a low around 31. South wind 6 to 11 mph becoming north in the evening. Winds could gust as high as 21 mph.
Sunday
A 20 percent chance of rain after noon. Increasing clouds, with a high near 47. Northeast wind around 10 mph.
Sunday Night
Rain and snow. Low around 33. East wind around 10 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Monday
A chance of rain and snow before noon, then a slight chance of rain. Cloudy, with a high near 45. Chance of precipitation is 40%.
Monday Night
Rain likely, mainly after midnight. Cloudy, with a low around 38. Chance of precipitation is 60%.
Tuesday
Rain and possibly a thunderstorm. High near 59. Chance of precipitation is 80%.
Tuesday Night
Rain likely and possibly a thunderstorm. Cloudy, with a low around 48. Chance of precipitation is 70%.
Wednesday
Rain likely and possibly a thunderstorm. Cloudy, with a high near 65. Chance of precipitation is 70%.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 51. Chance of precipitation is 70%.
Thursday
Rain likely. Mostly cloudy, with a high near 67. Chance of precipitation is 70%.
Thursday Night
A 50 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 53.
Friday
Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 71. Chance of precipitation is 60%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.73°N 90.11°W (Elev. 417 ft)
Last Update:
5:06 pm CST Feb 27, 2026
Forecast Valid:
6pm CST Feb 27, 2026-6pm CST Mar 6, 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