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.

Mostly Cloudy

81°F

27°C

Humidity 67%
Wind Speed NW 9 G 17 mph
Barometer 30.08 in (1018.2 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 7 Jul 10:53 am CDT
Extended Forecast for

Granite City IL

  • Today

    Today: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 87. Northeast wind 6 to 8 mph.

    High: 87 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Partly cloudy, with a low around 71. Northeast wind around 6 mph becoming calm in the evening.

    Low: 71 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 91. Calm wind.

    High: 91 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 73. Light south wind.

    Low: 73 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 96. Southwest wind 3 to 7 mph.

    High: 96 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 76. Chance of precipitation is 70%.

    Low: 76 °F

    Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 92. Chance of precipitation is 60%.

    High: 92 °F

    Chance
    Showers then
    Showers
    Likely

  • Friday Night

    Friday Night: Showers and thunderstorms likely. Mostly cloudy, with a low around 74. Chance of precipitation is 60%.

    Low: 74 °F

    T-storms
    Likely

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 90.

    High: 90 °F

    Chance
    T-storms

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 87. Northeast wind 6 to 8 mph.
Tonight
Partly cloudy, with a low around 71. Northeast wind around 6 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 91. Calm wind.
Wednesday Night
Mostly clear, with a low around 73. Light south wind.
Thursday
Mostly sunny, with a high near 96. Southwest wind 3 to 7 mph.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 76. Chance of precipitation is 70%.
Friday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 92. Chance of precipitation is 60%.
Friday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 74. Chance of precipitation is 60%.
Saturday
A 30 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
Mostly sunny, with a high near 91.
Sunday Night
Mostly clear, with a low around 73.
Monday
Sunny, with a high near 93.
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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:
10:21 am CDT Jul 7, 2026
Forecast Valid:
11am CDT Jul 7, 2026-6pm CDT Jul 13, 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