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.

Partly Cloudy

90°F

32°C

Humidity 59%
Wind Speed S 9 G 16 mph
Barometer 29.94 in (1013.3 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 15 Jul 2:53 pm CDT
Extended Forecast for

Granite City IL

  • This Afternoon

    This Afternoon: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 90. South wind around 6 mph.

    High: 90 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 73. Southwest wind 3 to 6 mph.

    Low: 73 °F

    Chance
    T-storms then
    Partly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 95. Heat index values as high as 106. Southwest wind 5 to 8 mph.

    High: 95 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 76. Southwest wind 5 to 7 mph.

    Low: 76 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 91. West wind 5 to 8 mph.

    High: 91 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71.

    Low: 71 °F

    Chance
    T-storms

  • Friday

    Friday: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 85.

    High: 85 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73.

    Low: 73 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 91.

    High: 91 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 90. South wind around 6 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 73. Southwest wind 3 to 6 mph.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Mostly sunny, with a high near 95. Heat index values as high as 106. Southwest wind 5 to 8 mph.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 76. Southwest wind 5 to 7 mph.
Thursday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 91. West wind 5 to 8 mph.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71.
Friday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 85.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 91.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Sunday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 94.
Sunday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 75.
Monday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 93.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 76.
Tuesday
Mostly sunny, with a high near 96.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.73°N 90.11°W (Elev. 417 ft)
Last Update:
4:21 pm CDT Jul 15, 2025
Forecast Valid:
4pm CDT Jul 15, 2025-6pm CDT Jul 22, 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