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.

Mostly Cloudy

83°F

28°C

Humidity 43%
Wind Speed S 12 G 26 mph
Barometer 29.76 in (1007.5 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 23 Apr 3:53 pm CDT
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 4am. Low around 64. South wind 10 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 80%.

    Low: 64 °F

    Partly Cloudy
    then Showers

  • Friday

    Friday: Showers and thunderstorms before 11am, then a chance of showers and thunderstorms after noon. High near 76. South wind 8 to 10 mph becoming west in the afternoon. Chance of precipitation is 90%.

    High: 76 °F

    Showers then
    Chance
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 52. North wind around 6 mph.

    Low: 52 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 78. East wind 5 to 7 mph.

    High: 78 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 55. East wind around 6 mph.

    Low: 55 °F

    Partly Cloudy

  • Sunday

    Sunday: A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 75. Chance of precipitation is 20%.

    High: 75 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62.

    Low: 62 °F

    Chance
    T-storms

  • Monday

    Monday: Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 80. Breezy. Chance of precipitation is 70%.

    High: 80 °F

    Chance
    Showers then
    T-storms
    Likely and
    Breezy

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 55. Chance of precipitation is 50%.

    Low: 55 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 4am. Low around 64. South wind 10 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 80%.
Friday
Showers and thunderstorms before 11am, then a chance of showers and thunderstorms after noon. High near 76. South wind 8 to 10 mph becoming west in the afternoon. Chance of precipitation is 90%.
Friday Night
Partly cloudy, with a low around 52. North wind around 6 mph.
Saturday
Sunny, with a high near 78. East wind 5 to 7 mph.
Saturday Night
Partly cloudy, with a low around 55. East wind around 6 mph.
Sunday
A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 75. Chance of precipitation is 20%.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62.
Monday
Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 80. Breezy. Chance of precipitation is 70%.
Monday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 55. Chance of precipitation is 50%.
Tuesday
Sunny, with a high near 73.
Tuesday Night
A 20 percent chance of showers. Mostly clear, with a low around 51.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 72.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 51.
Thursday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 67.
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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:
1:26 pm CDT Apr 23, 2026
Forecast Valid:
4pm CDT Apr 23, 2026-6pm CDT Apr 30, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation