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.

Fair

73°F

23°C

Humidity 90%
Wind Speed S 6 mph
Barometer 29.82 in (1009.2 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 18 Jun 3:53 am CDT
Extended Forecast for

Granite City IL

  • Today

    Today: A 50 percent chance of showers and thunderstorms, mainly after 7am. Mostly cloudy, with a high near 88. South wind 7 to 16 mph becoming southwest in the afternoon. Winds could gust as high as 24 mph.

    High: 88 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms, mainly before midnight. Mostly cloudy, with a low around 68. Southwest wind 6 to 10 mph.

    Low: 68 °F

    Chance
    T-storms then
    Slight Chance
    T-storms

  • Juneteenth

    Juneteenth: Sunny, with a high near 87. Northwest wind around 8 mph.

    High: 87 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 68. Light and variable wind.

    Low: 68 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 92. Calm wind becoming south 5 to 9 mph in the morning.

    High: 92 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 78.

    Low: 78 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

Detailed Forecast

Today
A 50 percent chance of showers and thunderstorms, mainly after 7am. Mostly cloudy, with a high near 88. South wind 7 to 16 mph becoming southwest in the afternoon. Winds could gust as high as 24 mph.
Tonight
A 50 percent chance of showers and thunderstorms, mainly before midnight. Mostly cloudy, with a low around 68. Southwest wind 6 to 10 mph.
Juneteenth
Sunny, with a high near 87. Northwest wind around 8 mph.
Thursday Night
Mostly clear, with a low around 68. Light and variable wind.
Friday
Sunny, with a high near 92. Calm wind becoming south 5 to 9 mph in the morning.
Friday Night
Mostly clear, with a low around 76.
Saturday
Sunny and hot, with a high near 97.
Saturday Night
Mostly clear, with a low around 78.
Sunday
Sunny and hot, with a high near 97.
Sunday Night
Mostly clear, with a low around 78.
Monday
Sunny and hot, with a high near 97.
Monday Night
Mostly clear, with a low around 77.
Tuesday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 95.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.71°N 90.14°W (Elev. 410 ft)
Last Update:
2:52 am CDT Jun 18, 2025
Forecast Valid:
4am CDT Jun 18, 2025-6pm CDT Jun 24, 2025
 
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