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.

A Few Clouds

82°F

28°C

Humidity 46%
Wind Speed S 14 G 31 mph
Barometer 29.86 in (1010.8 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 30 Mar 4:53 pm CDT
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Partly cloudy, with a low around 65. South wind 11 to 15 mph, with gusts as high as 25 mph.

    Low: 65 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly after 5pm. Partly sunny, with a high near 86. Southwest wind 11 to 18 mph, with gusts as high as 29 mph.

    High: 86 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 1am, then showers likely between 1am and 2am, then rain likely after 2am. Mostly cloudy, with a low around 60. Southwest wind 7 to 10 mph. Chance of precipitation is 70%.

    Low: 60 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: Rain, with thunderstorms also possible after 1pm. High near 75. Southeast wind 7 to 11 mph. Chance of precipitation is 80%.

    High: 75 °F

    Rain

  • Wednesday Night

    Wednesday Night: A chance of rain and thunderstorms before 1am, then rain likely between 1am and 4am, then rain likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 64. Southeast wind 10 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.

    Low: 64 °F

    Rain Likely

  • Thursday

    Thursday: Rain and possibly a thunderstorm. High near 80. Breezy. Chance of precipitation is 80%.

    High: 80 °F

    Rain and
    Breezy

  • Thursday Night

    Thursday Night: Rain and possibly a thunderstorm before 1am, then rain likely. Low around 60. Chance of precipitation is 80%.

    Low: 60 °F

    Rain

  • Friday

    Friday: A chance of rain, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. Chance of precipitation is 50%.

    High: 82 °F

    Chance Rain

  • Friday Night

    Friday Night: A chance of rain and thunderstorms, then rain likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 59. Chance of precipitation is 70%.

    Low: 59 °F

    Chance
    T-storms then
    Rain Likely

Detailed Forecast

Tonight
Partly cloudy, with a low around 65. South wind 11 to 15 mph, with gusts as high as 25 mph.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly after 5pm. Partly sunny, with a high near 86. Southwest wind 11 to 18 mph, with gusts as high as 29 mph.
Tuesday Night
A chance of showers and thunderstorms before 1am, then showers likely between 1am and 2am, then rain likely after 2am. Mostly cloudy, with a low around 60. Southwest wind 7 to 10 mph. Chance of precipitation is 70%.
Wednesday
Rain, with thunderstorms also possible after 1pm. High near 75. Southeast wind 7 to 11 mph. Chance of precipitation is 80%.
Wednesday Night
A chance of rain and thunderstorms before 1am, then rain likely between 1am and 4am, then rain likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 64. Southeast wind 10 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
Thursday
Rain and possibly a thunderstorm. High near 80. Breezy. Chance of precipitation is 80%.
Thursday Night
Rain and possibly a thunderstorm before 1am, then rain likely. Low around 60. Chance of precipitation is 80%.
Friday
A chance of rain, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. Chance of precipitation is 50%.
Friday Night
A chance of rain and thunderstorms, then rain likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 59. Chance of precipitation is 70%.
Saturday
Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 70. Chance of precipitation is 60%.
Saturday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 41.
Sunday
A 20 percent chance of rain. Mostly sunny, with a high near 60.
Sunday Night
Mostly clear, with a low around 38.
Monday
Sunny, with a high near 65.
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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:
2:57 pm CDT Mar 30, 2026
Forecast Valid:
5pm CDT Mar 30, 2026-6pm CDT Apr 6, 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