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

61°F

16°C

Humidity 30%
Wind Speed S 10 mph
Barometer 30.08 in (1018.6 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Last update 13 Feb 3:53 pm CST
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Increasing clouds, with a low around 37. South wind around 6 mph becoming calm after midnight.

    Low: 37 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Rain, mainly after 7am. High near 52. Calm wind becoming southeast 5 to 8 mph in the morning. Chance of precipitation is 90%.

    High: 52 °F

    Rain

  • Saturday Night

    Saturday Night: Rain, mainly before 5am. Low around 45. East wind around 7 mph. Chance of precipitation is 90%.

    Low: 45 °F

    Rain

  • Sunday

    Sunday: A 20 percent chance of rain before noon. Cloudy, then gradually becoming mostly sunny, with a high near 58. Northeast wind 6 to 9 mph.

    High: 58 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 39. North wind around 5 mph becoming calm in the evening.

    Low: 39 °F

    Mostly Clear

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 62.

    High: 62 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 44.

    Low: 44 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 65.

    High: 65 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 56.

    Low: 56 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 37. South wind around 6 mph becoming calm after midnight.
Saturday
Rain, mainly after 7am. High near 52. Calm wind becoming southeast 5 to 8 mph in the morning. Chance of precipitation is 90%.
Saturday Night
Rain, mainly before 5am. Low around 45. East wind around 7 mph. Chance of precipitation is 90%.
Sunday
A 20 percent chance of rain before noon. Cloudy, then gradually becoming mostly sunny, with a high near 58. Northeast wind 6 to 9 mph.
Sunday Night
Mostly clear, with a low around 39. North wind around 5 mph becoming calm in the evening.
Washington's Birthday
Mostly sunny, with a high near 62.
Monday Night
Mostly cloudy, with a low around 44.
Tuesday
Mostly cloudy, with a high near 65.
Tuesday Night
Mostly cloudy, with a low around 56.
Wednesday
Partly sunny, with a high near 72.
Wednesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 48.
Thursday
A 20 percent chance of rain. Mostly sunny, with a high near 65.
Thursday Night
Partly cloudy, with a low around 41.
Friday
Mostly sunny, with a high near 58.
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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:
4:56 pm CST Feb 13, 2026
Forecast Valid:
5pm CST Feb 13, 2026-6pm CST Feb 20, 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