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

79°F

26°C

Humidity 85%
Wind Speed Calm
Barometer 30.05 in (1017.1 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 3 Jul 1:53 am CDT
Extended Forecast for

Granite City IL

Extreme Heat Warning July 3, 02:13am until July 4, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning July 3, 02:13am until July 4, 08:00pm

    NOW until 8:00pm Sat

    Extreme Heat Warning

  • Overnight

    Low: 78 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Increasing clouds and hot, with a high near 97. Heat index values as high as 107. Calm wind becoming southeast 5 to 8 mph in the morning.

    High: 97 °F

    Sunny then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: Partly cloudy, with a low around 77. Southeast wind 5 to 7 mph becoming calm in the evening.

    Low: 77 °F

    Partly Cloudy

  • Independence Day

    Independence Day: A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 95. Heat index values as high as 106. Calm wind becoming southwest 5 to 7 mph in the morning.

    High: 95 °F

    Sunny then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 75. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%.

    Low: 75 °F

    Partly Cloudy
    then Chance
    T-storms

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 93.

    High: 93 °F

    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 73.

    Low: 73 °F

    Chance
    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.

    High: 90 °F

    Slight Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a low around 78. Calm wind.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Increasing clouds and hot, with a high near 97. Heat index values as high as 107. Calm wind becoming southeast 5 to 8 mph in the morning.
Friday Night
Partly cloudy, with a low around 77. Southeast wind 5 to 7 mph becoming calm in the evening.
Independence Day
A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 95. Heat index values as high as 106. Calm wind becoming southwest 5 to 7 mph in the morning.
Saturday Night
A slight chance of showers and thunderstorms before 7pm, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 75. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%.
Sunday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 93.
Sunday Night
A 40 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 73.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Monday Night
Mostly clear, with a low around 72.
Tuesday
Mostly sunny, with a high near 90.
Tuesday Night
Mostly clear, with a low around 72.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly 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:
1:26 am CDT Jul 3, 2026
Forecast Valid:
2am CDT Jul 3, 2026-6pm CDT Jul 9, 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