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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: A chance of rain and thunderstorms, then rain and possibly a thunderstorm after 2am. Low around 62. South wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 100%.

    Low: 62 °F

    Slight Chance
    T-storms then
    Rain

  • Saturday

    Saturday: Rain and thunderstorms, mainly before 11am. Temperature rising to near 68 by 11am, then falling to around 57 during the remainder of the day. Southwest wind 11 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 100%.

    High: 68 °F⇓

    Rain then
    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 38. Northwest wind 5 to 10 mph becoming light west after midnight.

    Low: 38 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 66. Calm wind becoming southwest 5 to 9 mph in the morning.

    High: 66 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 47. South wind around 6 mph.

    Low: 47 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Monday Night

    Monday Night: A 30 percent chance of rain and thunderstorms after midnight. Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear
    then Chance
    Rain

  • Tuesday

    Tuesday: A chance of rain and thunderstorms, then rain likely and possibly a thunderstorm after noon. Partly sunny, with a high near 80. Chance of precipitation is 70%.

    High: 80 °F

    Rain Likely

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 52. Chance of precipitation is 90%.

    Low: 52 °F

    Rain

Detailed Forecast

Tonight
A chance of rain and thunderstorms, then rain and possibly a thunderstorm after 2am. Low around 62. South wind around 14 mph, with gusts as high as 25 mph. Chance of precipitation is 100%.
Saturday
Rain and thunderstorms, mainly before 11am. Temperature rising to near 68 by 11am, then falling to around 57 during the remainder of the day. Southwest wind 11 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 100%.
Saturday Night
Partly cloudy, with a low around 38. Northwest wind 5 to 10 mph becoming light west after midnight.
Sunday
Sunny, with a high near 66. Calm wind becoming southwest 5 to 9 mph in the morning.
Sunday Night
Clear, with a low around 47. South wind around 6 mph.
Monday
Sunny, with a high near 79.
Monday Night
A 30 percent chance of rain and thunderstorms after midnight. Mostly clear, with a low around 59.
Tuesday
A chance of rain and thunderstorms, then rain likely and possibly a thunderstorm after noon. Partly sunny, with a high near 80. Chance of precipitation is 70%.
Tuesday Night
Rain and possibly a thunderstorm. Low around 52. Chance of precipitation is 90%.
Wednesday
Rain likely, mainly before noon. Cloudy, with a high near 61. Chance of precipitation is 70%.
Wednesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 37.
Thursday
Sunny, with a high near 58.
Thursday Night
Mostly clear, with a low around 40.
Friday
Mostly sunny, with a high near 68.
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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:
4:41 pm CST Mar 6, 2026
Forecast Valid:
6pm CST Mar 6, 2026-6pm CDT Mar 13, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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