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

50°F

10°C

Humidity 66%
Wind Speed SE 7 mph
Barometer 29.98 in (1015.2 mb)
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Wind Chill47°F (8°C)
Last update 16 Feb 8:53 pm CST
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 43. South wind around 7 mph.

    Low: 43 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Cloudy, with a high near 64. South wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 64 °F

    Cloudy

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms after 4am. Cloudy during the early evening, then gradual clearing, with a low around 56. Breezy, with a south wind 15 to 20 mph, with gusts as high as 33 mph.

    Low: 56 °F

    Cloudy and
    Breezy then
    Slight Chance
    T-storms

  • Wednesday

    Wednesday: Sunny, with a high near 72. West wind 7 to 14 mph, with gusts as high as 23 mph.

    High: 72 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 47. Southwest wind around 6 mph becoming south after midnight.

    Low: 47 °F

    Partly Cloudy

  • Thursday

    Thursday: A 40 percent chance of showers. Mostly sunny, with a high near 73.

    High: 73 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 20 percent chance of showers before midnight. Mostly clear, with a low around 38.

    Low: 38 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 51.

    High: 51 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 32.

    Low: 32 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 43. South wind around 7 mph.
Tuesday
Cloudy, with a high near 64. South wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 30 mph.
Tuesday Night
A 20 percent chance of showers and thunderstorms after 4am. Cloudy during the early evening, then gradual clearing, with a low around 56. Breezy, with a south wind 15 to 20 mph, with gusts as high as 33 mph.
Wednesday
Sunny, with a high near 72. West wind 7 to 14 mph, with gusts as high as 23 mph.
Wednesday Night
Partly cloudy, with a low around 47. Southwest wind around 6 mph becoming south after midnight.
Thursday
A 40 percent chance of showers. Mostly sunny, with a high near 73.
Thursday Night
A 20 percent chance of showers before midnight. Mostly clear, with a low around 38.
Friday
Mostly sunny, with a high near 51.
Friday Night
Partly cloudy, with a low around 32.
Saturday
Mostly sunny, with a high near 49.
Saturday Night
A 20 percent chance of rain. Partly cloudy, with a low around 29.
Sunday
Sunny, with a high near 43.
Sunday Night
Mostly clear, with a low around 22.
Monday
Mostly sunny, with a high near 43.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.73°N 90.11°W (Elev. 417 ft)
Last Update:
8:42 pm CST Feb 16, 2026
Forecast Valid:
10pm CST Feb 16, 2026-6pm CST Feb 23, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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