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.

Mostly Cloudy

91°F

33°C

Humidity 50%
Wind Speed Vrbl 6 mph
Barometer 30.00 in (1015.3 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index97°F (36°C)
Last update 20 Jun 2:53 pm CDT
Extended Forecast for

Granite City IL

Extreme Heat Warning June 21, 12:00pm until June 24, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 94. South wind 6 to 11 mph.

    High: 94 °F

    Mostly Sunny

  • Tonight

    Tonight: Clear, with a low around 77. South wind 7 to 11 mph, with gusts as high as 21 mph.

    Low: 77 °F

    Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 98. Heat index values as high as 109. Southwest wind 9 to 16 mph, with gusts as high as 25 mph.

    High: 98 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 77. South wind 7 to 13 mph, with gusts as high as 22 mph.

    Low: 77 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 97. Southwest wind 7 to 10 mph.

    High: 97 °F

    Hot

  • Sunday Night

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

    Low: 78 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 98.

    High: 98 °F

    Hot

  • Monday Night

    Monday Night: Partly cloudy, with a low around 78.

    Low: 78 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers before 1pm. Mostly sunny and hot, with a high near 97.

    High: 97 °F

    Slight Chance
    Showers

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 94. South wind 6 to 11 mph.
Tonight
Clear, with a low around 77. South wind 7 to 11 mph, with gusts as high as 21 mph.
Saturday
Sunny and hot, with a high near 98. Heat index values as high as 109. Southwest wind 9 to 16 mph, with gusts as high as 25 mph.
Saturday Night
Mostly clear, with a low around 77. South wind 7 to 13 mph, with gusts as high as 22 mph.
Sunday
Sunny and hot, with a high near 97. Southwest wind 7 to 10 mph.
Sunday Night
Mostly clear, with a low around 78.
Monday
Sunny and hot, with a high near 98.
Monday Night
Partly cloudy, with a low around 78.
Tuesday
A 20 percent chance of showers before 1pm. Mostly sunny and hot, with a high near 97.
Tuesday Night
Partly cloudy, with a low around 77.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 96.
Wednesday Night
Partly cloudy, with a low around 77.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly 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:
2:21 pm CDT Jun 20, 2025
Forecast Valid:
2pm CDT Jun 20, 2025-6pm CDT Jun 26, 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