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

44°F

7°C

Humidity 49%
Wind Speed SE 5 mph
Barometer 30.19 in (1022.7 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 12 Feb 7:53 pm CST
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Partly cloudy, with a low around 33. Southeast wind 3 to 6 mph.

    Low: 33 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 60. South wind 5 to 9 mph.

    High: 60 °F

    Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 38. Southeast wind around 6 mph becoming calm after midnight.

    Low: 38 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Rain, mainly after noon. High near 53. Calm wind becoming southeast 5 to 8 mph in the morning. Chance of precipitation is 80%.

    High: 53 °F

    Chance Rain
    then Rain

  • Saturday Night

    Saturday Night: Rain. Low around 44. East wind around 7 mph. Chance of precipitation is 90%.

    Low: 44 °F

    Rain

  • Sunday

    Sunday: A 20 percent chance of rain before noon. Mostly sunny, with a high near 59.

    High: 59 °F

    Slight Chance
    Rain then
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 46.

    Low: 46 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 33. Southeast wind 3 to 6 mph.
Friday
Sunny, with a high near 60. South wind 5 to 9 mph.
Friday Night
Increasing clouds, with a low around 38. Southeast wind around 6 mph becoming calm after midnight.
Saturday
Rain, mainly after noon. High near 53. Calm wind becoming southeast 5 to 8 mph in the morning. Chance of precipitation is 80%.
Saturday Night
Rain. Low around 44. East wind around 7 mph. Chance of precipitation is 90%.
Sunday
A 20 percent chance of rain before noon. Mostly sunny, with a high near 59.
Sunday Night
Mostly clear, with a low around 37.
Washington's Birthday
Mostly sunny, with a high near 63.
Monday Night
Mostly cloudy, with a low around 46.
Tuesday
Mostly cloudy, with a high near 67.
Tuesday Night
Mostly cloudy, with a low around 56.
Wednesday
Partly sunny, with a high near 71.
Wednesday Night
A 20 percent chance of rain. Partly cloudy, with a low around 46.
Thursday
A 20 percent chance of rain. Sunny, with a high near 62.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.73°N 90.11°W (Elev. 417 ft)
Last Update:
7:26 pm CST Feb 12, 2026
Forecast Valid:
8pm CST Feb 12, 2026-6pm CST Feb 19, 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