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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Granite City IL

  • Today

    Today: Scattered showers, with thunderstorms also possible after 3pm. Patchy fog before noon. Otherwise, cloudy, with a high near 53. Light and variable wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 50%.

    High: 53 °F

    Scattered
    Showers and
    Patchy Fog

  • Tonight

    Tonight: Scattered showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Patchy fog after 9pm. Otherwise, cloudy, with a low around 50. Northeast wind 3 to 6 mph. Chance of precipitation is 70%.

    Low: 50 °F

    Showers
    Likely and
    Patchy Fog

  • Wednesday

    Wednesday: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 2pm. Patchy fog before noon. High near 62. Light and variable wind becoming southeast around 6 mph in the morning. Chance of precipitation is 80%.

    High: 62 °F

    Showers and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: Showers, with thunderstorms also possible after 9pm. Low around 55. South wind around 6 mph becoming southwest after midnight. Chance of precipitation is 100%.

    Low: 55 °F

    Showers

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 69. Southwest wind 6 to 9 mph. Chance of precipitation is 70%.

    High: 69 °F

    Showers
    Likely then
    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.

    Low: 57 °F

    Chance
    Showers then
    Showers
    Likely

  • Friday

    Friday: A chance of showers and thunderstorms before noon, then a slight chance of showers. Mostly cloudy, with a high near 79. Chance of precipitation is 40%.

    High: 79 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers, then showers and possibly a thunderstorm after midnight. Low around 59. Chance of precipitation is 80%.

    Low: 59 °F

    Chance
    Showers then
    Showers

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm before noon, then a slight chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 69. Chance of precipitation is 60%.

    High: 69 °F

    Showers
    Likely then
    Slight Chance
    T-storms

Detailed Forecast

Today
Scattered showers, with thunderstorms also possible after 3pm. Patchy fog before noon. Otherwise, cloudy, with a high near 53. Light and variable wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 50%.
Tonight
Scattered showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Patchy fog after 9pm. Otherwise, cloudy, with a low around 50. Northeast wind 3 to 6 mph. Chance of precipitation is 70%.
Wednesday
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 2pm. Patchy fog before noon. High near 62. Light and variable wind becoming southeast around 6 mph in the morning. Chance of precipitation is 80%.
Wednesday Night
Showers, with thunderstorms also possible after 9pm. Low around 55. South wind around 6 mph becoming southwest after midnight. Chance of precipitation is 100%.
Thursday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 69. Southwest wind 6 to 9 mph. Chance of precipitation is 70%.
Thursday Night
A chance of showers, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.
Friday
A chance of showers and thunderstorms before noon, then a slight chance of showers. Mostly cloudy, with a high near 79. Chance of precipitation is 40%.
Friday Night
A chance of showers, then showers and possibly a thunderstorm after midnight. Low around 59. Chance of precipitation is 80%.
Saturday
Showers likely and possibly a thunderstorm before noon, then a slight chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 69. Chance of precipitation is 60%.
Saturday Night
Mostly cloudy, with a low around 45.
Sunday
Mostly sunny, with a high near 69.
Sunday Night
Mostly clear, with a low around 50.
Monday
A 20 percent chance of showers. Sunny, with a high near 74.
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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:
10:46 am CST Mar 3, 2026
Forecast Valid:
11am CST Mar 3, 2026-6pm CDT Mar 9, 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