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 7 mph
Barometer 29.93 in (1013.9 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 5 Feb 7:53 pm CST
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Mostly cloudy during the early evening, then becoming mostly clear, with a low around 30. Light and variable wind becoming west 5 to 7 mph after midnight.

    Low: 30 °F

    Mostly Clear

  • Friday

    Friday: Sunny through mid morning, then becoming mostly cloudy, with a high near 47. Southwest wind 9 to 18 mph becoming northwest in the afternoon. Winds could gust as high as 32 mph.

    High: 47 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Partly cloudy, with a low around 23. Northwest wind 5 to 15 mph, with gusts as high as 26 mph.

    Low: 23 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 35. Northeast wind around 6 mph becoming southeast in the afternoon.

    High: 35 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 26. Southeast wind 6 to 8 mph.

    Low: 26 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 51.

    High: 51 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 57.

    High: 57 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy during the early evening, then becoming mostly clear, with a low around 30. Light and variable wind becoming west 5 to 7 mph after midnight.
Friday
Sunny through mid morning, then becoming mostly cloudy, with a high near 47. Southwest wind 9 to 18 mph becoming northwest in the afternoon. Winds could gust as high as 32 mph.
Friday Night
Partly cloudy, with a low around 23. Northwest wind 5 to 15 mph, with gusts as high as 26 mph.
Saturday
Sunny, with a high near 35. Northeast wind around 6 mph becoming southeast in the afternoon.
Saturday Night
Mostly cloudy, with a low around 26. Southeast wind 6 to 8 mph.
Sunday
Mostly sunny, with a high near 51.
Sunday Night
Mostly clear, with a low around 30.
Monday
Sunny, with a high near 57.
Monday Night
Mostly clear, with a low around 40.
Tuesday
A 20 percent chance of rain after noon. Partly sunny, with a high near 65.
Tuesday Night
A 40 percent chance of rain. Cloudy, with a low around 43.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 55.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 36.
Thursday
A 30 percent chance of rain. Mostly cloudy, with a high near 49.
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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:
7:41 pm CST Feb 5, 2026
Forecast Valid:
8pm CST Feb 5, 2026-6pm CST Feb 12, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation