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

78°F

26°C

Humidity 30%
Wind Speed S 12 G 21 mph
Barometer 30.10 in (1018.9 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 9 Apr 5:53 pm CDT
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Increasing clouds, with a low around 60. South wind around 11 mph, with gusts as high as 22 mph.

    Low: 60 °F

    Increasing
    Clouds

  • Friday

    Friday: Showers likely before 1pm, then showers likely and possibly a thunderstorm between 1pm and 3pm, then a chance of showers and thunderstorms after 3pm. Mostly cloudy, with a high near 72. Southwest wind 7 to 10 mph becoming northwest in the afternoon. Chance of precipitation is 70%.

    High: 72 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 40 percent chance of showers, mainly after 7pm. Mostly cloudy, with a low around 52. East wind 5 to 7 mph.

    Low: 52 °F

    Chance
    Showers

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 74. Southeast wind 6 to 9 mph. Chance of precipitation is 40%.

    High: 74 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 61. Southeast wind around 8 mph.

    Low: 61 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 79.

    High: 79 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.

    Low: 65 °F

    Chance
    Showers then
    Showers
    Likely

  • Monday

    Monday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 84. Chance of precipitation is 40%.

    High: 84 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69.

    Low: 69 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Increasing clouds, with a low around 60. South wind around 11 mph, with gusts as high as 22 mph.
Friday
Showers likely before 1pm, then showers likely and possibly a thunderstorm between 1pm and 3pm, then a chance of showers and thunderstorms after 3pm. Mostly cloudy, with a high near 72. Southwest wind 7 to 10 mph becoming northwest in the afternoon. Chance of precipitation is 70%.
Friday Night
A 40 percent chance of showers, mainly after 7pm. Mostly cloudy, with a low around 52. East wind 5 to 7 mph.
Saturday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 74. Southeast wind 6 to 9 mph. Chance of precipitation is 40%.
Saturday Night
Mostly cloudy, with a low around 61. Southeast wind around 8 mph.
Sunday
A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 79.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.
Monday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 84. Chance of precipitation is 40%.
Monday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69.
Tuesday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 86.
Tuesday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 59.
Thursday
A 30 percent chance of showers. Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.73°N 90.11°W (Elev. 417 ft)
Last Update:
5:16 pm CDT Apr 9, 2026
Forecast Valid:
6pm CDT Apr 9, 2026-6pm CDT Apr 16, 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