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.

Overcast

49°F

9°C

Humidity 46%
Wind Speed N 13 mph
Barometer 30.34 in (1027.4 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 7 Apr 3:53 am CDT
Extended Forecast for

Granite City IL

  • Today

    Today: Cloudy, then gradually becoming mostly sunny, with a high near 55. East wind 10 to 13 mph, with gusts as high as 20 mph.

    High: 55 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Partly cloudy, with a low around 41. East wind 7 to 9 mph.

    Low: 41 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 74. South wind 8 to 15 mph, with gusts as high as 24 mph.

    High: 74 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 54. South wind 9 to 11 mph, with gusts as high as 20 mph.

    Low: 54 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 78. South wind 8 to 10 mph.

    High: 78 °F

    Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 73. Chance of precipitation is 50%.

    High: 73 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 56.

    Low: 56 °F

    Chance
    T-storms

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 76. Chance of precipitation is 30%.

    High: 76 °F

    Chance
    Showers

Detailed Forecast

Today
Cloudy, then gradually becoming mostly sunny, with a high near 55. East wind 10 to 13 mph, with gusts as high as 20 mph.
Tonight
Partly cloudy, with a low around 41. East wind 7 to 9 mph.
Wednesday
Mostly sunny, with a high near 74. South wind 8 to 15 mph, with gusts as high as 24 mph.
Wednesday Night
Mostly clear, with a low around 54. South wind 9 to 11 mph, with gusts as high as 20 mph.
Thursday
Sunny, with a high near 78. South wind 8 to 10 mph.
Thursday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 58.
Friday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 73. Chance of precipitation is 50%.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 56.
Saturday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 76. Chance of precipitation is 30%.
Saturday Night
Mostly cloudy, with a low around 61.
Sunday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 82.
Sunday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Monday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 84.
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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:
5:21 am CDT Apr 7, 2026
Forecast Valid:
5am CDT Apr 7, 2026-6pm CDT Apr 13, 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