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

84°F

29°C

Humidity 67%
Wind Speed Calm
Barometer 30.05 in (1017.2 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 8 Jul 9:53 am CDT
Extended Forecast for

Granite City IL

  • Today

    Today: Isolated showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 20%.

    High: 91 °F

    Sunny then
    Isolated
    T-storms

  • Tonight

    Tonight: Mostly clear, with a low around 73. South wind 3 to 6 mph.

    Low: 73 °F

    Mostly Clear

  • Thursday

    Thursday: Scattered showers and thunderstorms, mainly after 2pm. Increasing clouds, with a high near 94. Heat index values as high as 100. Southwest wind 5 to 8 mph. Chance of precipitation is 50%.

    High: 94 °F

    Mostly Sunny
    then
    Scattered
    T-storms

  • Thursday Night

    Thursday Night: Showers and thunderstorms, mainly after 10pm. Low around 75. South wind around 6 mph becoming light and variable in the evening. Chance of precipitation is 80%.

    Low: 75 °F

    T-storms

  • Friday

    Friday: Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 92. West wind 3 to 6 mph. Chance of precipitation is 60%.

    High: 92 °F

    T-storms
    Likely

  • Friday Night

    Friday Night: Showers and thunderstorms likely. Mostly cloudy, with a low around 74. Chance of precipitation is 70%.

    Low: 74 °F

    T-storms
    Likely

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 90.

    High: 90 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.

    Low: 73 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 90.

    High: 90 °F

    Chance
    T-storms

Detailed Forecast

Today
Isolated showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 20%.
Tonight
Mostly clear, with a low around 73. South wind 3 to 6 mph.
Thursday
Scattered showers and thunderstorms, mainly after 2pm. Increasing clouds, with a high near 94. Heat index values as high as 100. Southwest wind 5 to 8 mph. Chance of precipitation is 50%.
Thursday Night
Showers and thunderstorms, mainly after 10pm. Low around 75. South wind around 6 mph becoming light and variable in the evening. Chance of precipitation is 80%.
Friday
Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 92. West wind 3 to 6 mph. Chance of precipitation is 60%.
Friday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 74. Chance of precipitation is 70%.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 90.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Sunday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 90.
Sunday Night
Mostly clear, with a low around 72.
Monday
Sunny, with a high near 92.
Monday Night
Clear, with a low around 74.
Tuesday
Sunny, with a high near 94.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.71°N 90.14°W (Elev. 410 ft)
Last Update:
8:16 am CDT Jul 8, 2026
Forecast Valid:
10am CDT Jul 8, 2026-6pm CDT Jul 14, 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