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

31°F

-1°C

Humidity 72%
Wind Speed S 5 mph
Barometer 29.93 in (1013.9 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill26°F (-3°C)
Last update 5 Jan 3:53 am CST
Extended Forecast for

Granite City IL

  • Today

    Today: Sunny, with a high near 58. South wind 6 to 9 mph.

    High: 58 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 46. South wind 8 to 10 mph.

    Low: 46 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 61. Southwest wind 8 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph.

    High: 61 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 37. West wind around 6 mph becoming calm in the evening.

    Low: 37 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 61. Calm wind becoming south 5 to 8 mph in the afternoon.

    High: 61 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 47.

    Low: 47 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Thursday

    Thursday: Rain likely, mainly after noon. Mostly cloudy, with a high near 61. Chance of precipitation is 70%.

    High: 61 °F

    Rain Likely

  • Thursday Night

    Thursday Night: Rain likely, mainly before midnight. Mostly cloudy, with a low around 51. Chance of precipitation is 70%.

    Low: 51 °F

    Rain Likely

  • Friday

    Friday: A chance of rain and thunderstorms. Partly sunny, with a high near 63. Chance of precipitation is 40%.

    High: 63 °F

    Chance Rain

Detailed Forecast

Today
Sunny, with a high near 58. South wind 6 to 9 mph.
Tonight
Partly cloudy, with a low around 46. South wind 8 to 10 mph.
Tuesday
Mostly sunny, with a high near 61. Southwest wind 8 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph.
Tuesday Night
Mostly clear, with a low around 37. West wind around 6 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 61. Calm wind becoming south 5 to 8 mph in the afternoon.
Wednesday Night
A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 47.
Thursday
Rain likely, mainly after noon. Mostly cloudy, with a high near 61. Chance of precipitation is 70%.
Thursday Night
Rain likely, mainly before midnight. Mostly cloudy, with a low around 51. Chance of precipitation is 70%.
Friday
A chance of rain and thunderstorms. Partly sunny, with a high near 63. Chance of precipitation is 40%.
Friday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 35.
Saturday
Mostly sunny, with a high near 44.
Saturday Night
Mostly clear, with a low around 25.
Sunday
Mostly sunny, with a high near 40.
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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:
4:46 am CST Jan 5, 2026
Forecast Valid:
4am CST Jan 5, 2026-6pm CST Jan 11, 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