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.

Overcast

62°F

17°C

Humidity 90%
Wind Speed SW 3 mph
Barometer 29.75 in (1007.1 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 11 Mar 9:53 am CDT
Extended Forecast for

Granite City IL

  • Today

    Today: A 50 percent chance of showers, mainly before 3pm. Cloudy, with a temperature falling to around 45 by 4pm. Breezy, with a northwest wind 11 to 20 mph, with gusts as high as 31 mph.

    High: 62 °F⇓

    Chance
    Showers and
    Breezy

  • Tonight

    Tonight: Mostly cloudy during the early evening, then gradual clearing, with a low around 32. Northwest wind 13 to 18 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 29 mph.

    Low: 32 °F

    Gradual
    Clearing

  • Thursday

    Thursday: Sunny, with a high near 56. Light west wind becoming southwest 5 to 10 mph in the morning.

    High: 56 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 45. Breezy, with a south wind 10 to 20 mph, with gusts as high as 30 mph.

    Low: 45 °F

    Partly Cloudy
    then Partly
    Cloudy and
    Breezy

  • Friday

    Friday: Partly sunny, with a high near 62. Southwest wind 11 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 23 mph.

    High: 62 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 65.

    High: 65 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of rain and thunderstorms after 1am. Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Sunday

    Sunday: Rain likely and possibly a thunderstorm, then rain after 1pm. High near 65. Breezy. Chance of precipitation is 80%.

    High: 65 °F

    Rain and
    Breezy

Detailed Forecast

Today
A 50 percent chance of showers, mainly before 3pm. Cloudy, with a temperature falling to around 45 by 4pm. Breezy, with a northwest wind 11 to 20 mph, with gusts as high as 31 mph.
Tonight
Mostly cloudy during the early evening, then gradual clearing, with a low around 32. Northwest wind 13 to 18 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 29 mph.
Thursday
Sunny, with a high near 56. Light west wind becoming southwest 5 to 10 mph in the morning.
Thursday Night
Partly cloudy, with a low around 45. Breezy, with a south wind 10 to 20 mph, with gusts as high as 30 mph.
Friday
Partly sunny, with a high near 62. Southwest wind 11 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 23 mph.
Friday Night
Mostly cloudy, with a low around 38.
Saturday
Partly sunny, with a high near 65.
Saturday Night
A 20 percent chance of rain and thunderstorms after 1am. Mostly cloudy, with a low around 54.
Sunday
Rain likely and possibly a thunderstorm, then rain after 1pm. High near 65. Breezy. Chance of precipitation is 80%.
Sunday Night
A chance of rain and snow before 1am. Mostly cloudy, with a low around 25. Blustery. Chance of precipitation is 30%.
Monday
Sunny, with a high near 39.
Monday Night
Partly cloudy, with a low around 21.
Tuesday
Partly sunny, with a high near 43.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.73°N 90.11°W (Elev. 417 ft)
Last Update:
7:41 am CDT Mar 11, 2026
Forecast Valid:
10am CDT Mar 11, 2026-6pm CDT Mar 17, 2026
 
Forecast Discussion
 
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Additional Resources

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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