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

51°F

11°C

Humidity 36%
Wind Speed S 8 mph
Barometer 30.25 in (1024.4 mb)
Dewpoint 25°F (-4°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 12 Mar 1:53 pm CDT
Extended Forecast for

Granite City IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 55. Southwest wind around 10 mph.

    High: 55 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 46. Breezy, with a south wind 10 to 15 mph increasing to 16 to 21 mph after midnight. Winds could gust as high as 32 mph.

    Low: 46 °F

    Partly Cloudy
    then Partly
    Cloudy and
    Breezy

  • Friday

    Friday: Mostly sunny, with a high near 61. West wind 13 to 16 mph, with gusts as high as 26 mph.

    High: 61 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 36. Northwest wind around 6 mph becoming calm.

    Low: 36 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 65. Southeast wind 6 to 13 mph, with gusts as high as 20 mph.

    High: 65 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of rain and thunderstorms, then rain and possibly a thunderstorm after 1pm. High near 69. Breezy. Chance of precipitation is 90%.

    High: 69 °F

    Breezy.
    Chance Rain
    then Rain

  • Sunday Night

    Sunday Night: Rain and snow before 1am, then a chance of snow. Some thunder is also possible. Low around 22. Breezy. Chance of precipitation is 80%.

    Low: 22 °F

    Rain/Snow and
    Breezy

  • Monday

    Monday: A 20 percent chance of snow before 1pm. Partly sunny, with a high near 29. Blustery.

    High: 29 °F

    Slight Chance
    Snow and
    Blustery

Detailed Forecast

This Afternoon
Sunny, with a high near 55. Southwest wind around 10 mph.
Tonight
Partly cloudy, with a low around 46. Breezy, with a south wind 10 to 15 mph increasing to 16 to 21 mph after midnight. Winds could gust as high as 32 mph.
Friday
Mostly sunny, with a high near 61. West wind 13 to 16 mph, with gusts as high as 26 mph.
Friday Night
Partly cloudy, with a low around 36. Northwest wind around 6 mph becoming calm.
Saturday
Partly sunny, with a high near 65. Southeast wind 6 to 13 mph, with gusts as high as 20 mph.
Saturday Night
Mostly cloudy, with a low around 54.
Sunday
A chance of rain and thunderstorms, then rain and possibly a thunderstorm after 1pm. High near 69. Breezy. Chance of precipitation is 90%.
Sunday Night
Rain and snow before 1am, then a chance of snow. Some thunder is also possible. Low around 22. Breezy. Chance of precipitation is 80%.
Monday
A 20 percent chance of snow before 1pm. Partly sunny, with a high near 29. Blustery.
Monday Night
Mostly clear, with a low around 14.
Tuesday
Mostly sunny, with a high near 35.
Tuesday Night
A chance of rain and snow. Mostly cloudy, with a low around 27. Chance of precipitation is 30%.
Wednesday
Partly sunny, with a high near 55.
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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:
1:41 pm CDT Mar 12, 2026
Forecast Valid:
2pm CDT Mar 12, 2026-6pm CDT Mar 18, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation