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

36°F

2°C

Humidity 67%
Wind Speed Calm
Barometer 30.11 in (1020.0 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Last update 12 Jan 9:53 pm CST
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Mostly clear, with a low around 38. South wind 3 to 7 mph.

    Low: 38 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 61. West wind 8 to 14 mph, with gusts as high as 26 mph.

    High: 61 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain, mainly between 7pm and 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 37. West wind 8 to 13 mph, with gusts as high as 23 mph.

    Low: 37 °F

    Chance Rain

  • Wednesday

    Wednesday: Mostly cloudy, with a temperature rising to near 42 by 11am, then falling to around 34 during the remainder of the day. Breezy, with a northwest wind 14 to 21 mph, with gusts as high as 32 mph.

    High: 42 °F⇓

    Mostly Cloudy
    then Partly
    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 18. North wind 9 to 15 mph, with gusts as high as 24 mph.

    Low: 18 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 32.

    High: 32 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy

  • Friday

    Friday: A slight chance of rain and snow after noon. Mostly cloudy, with a high near 43. Chance of precipitation is 20%.

    High: 43 °F

    Mostly Cloudy
    then Slight
    Chance
    Rain/Snow

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 20.

    Low: 20 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 38. South wind 3 to 7 mph.
Tuesday
Increasing clouds, with a high near 61. West wind 8 to 14 mph, with gusts as high as 26 mph.
Tuesday Night
A 30 percent chance of rain, mainly between 7pm and 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 37. West wind 8 to 13 mph, with gusts as high as 23 mph.
Wednesday
Mostly cloudy, with a temperature rising to near 42 by 11am, then falling to around 34 during the remainder of the day. Breezy, with a northwest wind 14 to 21 mph, with gusts as high as 32 mph.
Wednesday Night
Mostly clear, with a low around 18. North wind 9 to 15 mph, with gusts as high as 24 mph.
Thursday
Mostly sunny, with a high near 32.
Thursday Night
Mostly cloudy, with a low around 26.
Friday
A slight chance of rain and snow after noon. Mostly cloudy, with a high near 43. Chance of precipitation is 20%.
Friday Night
Mostly cloudy, with a low around 20.
Saturday
Mostly cloudy, with a high near 30.
Saturday Night
Partly cloudy, with a low around 10.
Sunday
Mostly sunny, with a high near 27.
Sunday Night
Partly cloudy, with a low around 14.
M.L.King Day
Mostly sunny, with a high near 36.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.71°N 90.11°W (Elev. 413 ft)
Last Update:
9:41 pm CST Jan 12, 2026
Forecast Valid:
10pm CST Jan 12, 2026-6pm CST Jan 19, 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