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

79°F

26°C

Humidity 45%
Wind Speed W 5 mph
Barometer 30.02 in (1016.3 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 11 Oct 12:53 pm CDT
Extended Forecast for

Granite City IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 89. Light southwest wind.

    High: 89 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 63. South wind around 6 mph.

    Low: 63 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 95. Southwest wind 6 to 11 mph.

    High: 95 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 71. South wind 7 to 9 mph.

    Low: 71 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93. Southwest wind 6 to 9 mph.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72.

    Low: 72 °F

    Partly Cloudy
    then Chance
    T-storms

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 84. Chance of precipitation is 90%.

    High: 84 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 65. Chance of precipitation is 70%.

    Low: 65 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 79. Chance of precipitation is 80%.

    High: 79 °F

    Showers

Detailed Forecast

This Afternoon
Sunny, with a high near 89. Light southwest wind.
Tonight
Mostly clear, with a low around 63. South wind around 6 mph.
Columbus Day
Sunny, with a high near 95. Southwest wind 6 to 11 mph.
Monday Night
Mostly clear, with a low around 71. South wind 7 to 9 mph.
Tuesday
Sunny, with a high near 93. Southwest wind 6 to 9 mph.
Tuesday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72.
Wednesday
Showers and possibly a thunderstorm. High near 84. Chance of precipitation is 90%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 65. Chance of precipitation is 70%.
Thursday
Showers and possibly a thunderstorm. High near 79. Chance of precipitation is 80%.
Thursday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 55.
Friday
Partly sunny, with a high near 68. Breezy.
Friday Night
Partly cloudy, with a low around 41.
Saturday
Sunny, with a high near 62.
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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 Oct 11, 2026
Forecast Valid:
1pm CDT Oct 11, 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