National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

42°F

6°C

Humidity 73%
Wind Speed W 5 mph
Barometer 30.27 in (1025.1 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 6 Apr 4:53 am CDT
Extended Forecast for

Granite City IL

  • Today

    Today: Sunny, with a high near 63. Northwest wind 5 to 13 mph, with gusts as high as 21 mph.

    High: 63 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 38. Northeast wind 7 to 10 mph, with gusts as high as 21 mph.

    Low: 38 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 55. East wind around 11 mph.

    High: 55 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40. East wind 7 to 9 mph.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 73. South wind 8 to 15 mph, with gusts as high as 23 mph.

    High: 73 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 71. Chance of precipitation is 30%.

    High: 71 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 58.

    Low: 58 °F

    Chance
    T-storms

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 74.

    High: 74 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 63. Northwest wind 5 to 13 mph, with gusts as high as 21 mph.
Tonight
Increasing clouds, with a low around 38. Northeast wind 7 to 10 mph, with gusts as high as 21 mph.
Tuesday
Mostly cloudy, with a high near 55. East wind around 11 mph.
Tuesday Night
Mostly cloudy, with a low around 40. East wind 7 to 9 mph.
Wednesday
Partly sunny, with a high near 73. South wind 8 to 15 mph, with gusts as high as 23 mph.
Wednesday Night
Partly cloudy, with a low around 55.
Thursday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 71. Chance of precipitation is 30%.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 58.
Friday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 74.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 56.
Saturday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 80.
Saturday Night
A 20 percent chance of showers. Partly cloudy, with a low around 62.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81.
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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:
4:21 am CDT Apr 6, 2026
Forecast Valid:
5am CDT Apr 6, 2026-6pm CDT Apr 12, 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