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.

Fair

69°F

21°C

Humidity 59%
Wind Speed SE 6 mph
Barometer 29.99 in (1015.4 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 10 Oct 6:53 pm CDT
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Partly cloudy, with a low around 54. Southeast wind 5 to 7 mph becoming calm in the evening.

    Low: 54 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 88. Light and variable wind.

    High: 88 °F

    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 64. Southeast wind 3 to 5 mph.

    Low: 64 °F

    Increasing
    Clouds

  • Columbus Day

    Columbus Day: Sunny, with a high near 95. Southwest wind 5 to 11 mph.

    High: 95 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 70. Southwest wind 7 to 10 mph.

    Low: 70 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms, then a chance of showers after 1am. Mostly clear, with a low around 70. Chance of precipitation is 40%.

    Low: 70 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 85. Chance of precipitation is 80%.

    High: 85 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.

    Low: 64 °F

    Showers
    Likely

Detailed Forecast

Tonight
Partly cloudy, with a low around 54. Southeast wind 5 to 7 mph becoming calm in the evening.
Sunday
Sunny, with a high near 88. Light and variable wind.
Sunday Night
Increasing clouds, with a low around 64. Southeast wind 3 to 5 mph.
Columbus Day
Sunny, with a high near 95. Southwest wind 5 to 11 mph.
Monday Night
Clear, with a low around 70. Southwest wind 7 to 10 mph.
Tuesday
Sunny, with a high near 93.
Tuesday Night
A slight chance of showers and thunderstorms, then a chance of showers after 1am. Mostly clear, with a low around 70. Chance of precipitation is 40%.
Wednesday
Showers and possibly a thunderstorm. High near 85. Chance of precipitation is 80%.
Wednesday Night
Showers likely. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Thursday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 80. Chance of precipitation is 60%.
Thursday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 56.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 73.
Friday Night
Partly cloudy, with a low around 46.
Saturday
Mostly sunny, with a high near 66.
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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:
4:41 pm CDT Oct 10, 2026
Forecast Valid:
7pm CDT Oct 10, 2026-6pm CDT Oct 17, 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