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

69°F

21°C

Humidity 93%
Wind Speed S 5 mph
Barometer 29.96 in (1014.3 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 25 Jun 1:53 am CDT
Extended Forecast for

Granite City IL

Flood Watch June 25, 01:00pm until June 26, 07:00am
Click here for hazard details and duration
Flood Watch

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. Calm wind.

    Low: 69 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms, mainly after 2pm. Mostly cloudy, with a high near 88. Light and variable wind.

    High: 88 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3am. Some of the storms could produce heavy rainfall. Low around 70. Northeast wind around 5 mph becoming light and variable. Chance of precipitation is 90%.

    Low: 70 °F

    Heavy Rain
    then T-storms

  • Friday

    Friday: Showers and thunderstorms before 2pm, then showers likely and possibly a thunderstorm between 2pm and 3pm, then a chance of showers and thunderstorms after 3pm. Some of the storms could produce heavy rainfall. High near 84. Southwest wind 7 to 10 mph. Chance of precipitation is 90%.

    High: 84 °F

    Heavy Rain

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 7pm. Mostly cloudy, with a low around 71. Southwest wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 70%.

    Low: 71 °F

    Showers
    Likely

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 89.

    High: 89 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 74.

    Low: 74 °F

    Slight Chance
    T-storms

  • Sunday

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

    High: 97 °F

    Hot

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 77.

    Low: 77 °F

    Mostly Clear

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. Calm wind.
Thursday
A 40 percent chance of showers and thunderstorms, mainly after 2pm. Mostly cloudy, with a high near 88. Light and variable wind.
Thursday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3am. Some of the storms could produce heavy rainfall. Low around 70. Northeast wind around 5 mph becoming light and variable. Chance of precipitation is 90%.
Friday
Showers and thunderstorms before 2pm, then showers likely and possibly a thunderstorm between 2pm and 3pm, then a chance of showers and thunderstorms after 3pm. Some of the storms could produce heavy rainfall. High near 84. Southwest wind 7 to 10 mph. Chance of precipitation is 90%.
Friday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 7pm. Mostly cloudy, with a low around 71. Southwest wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 70%.
Saturday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 89.
Saturday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 74.
Sunday
Sunny and hot, with a high near 97.
Sunday Night
Mostly clear, with a low around 77.
Monday
Sunny and hot, with a high near 98.
Monday Night
Mostly clear, with a low around 79.
Tuesday
Sunny and hot, with a high near 99.
Tuesday Night
Clear, with a low around 78.
Wednesday
Sunny and hot, with a high near 99.
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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:
1:51 am CDT Jun 25, 2026
Forecast Valid:
2am CDT Jun 25, 2026-6pm CDT Jul 1, 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