National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Light Snow

25°F

-4°C

Humidity 58%
Wind Speed NW 20 G 31 mph
Barometer 30.15 in (1021.6 mb)
Dewpoint 12°F (-11°C)
Visibility 10.00 mi
Wind Chill11°F (-12°C)
Last update 16 Mar 8:53 pm CDT
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: Scattered flurries before 10pm. Cloudy early, then gradual clearing, with a low around 16. Northwest wind 13 to 15 mph, with gusts as high as 29 mph.

    Low: 16 °F

    Scattered
    Flurries

  • Tuesday

    Tuesday: Increasing clouds, with a high near 35. Northwest wind 6 to 9 mph becoming southwest in the afternoon.

    High: 35 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A chance of snow before 4am, then a slight chance of rain. Cloudy, with a low around 32. Southeast wind 7 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    Low: 32 °F

    Chance Snow
    then Chance
    Rain/Snow

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 65. South wind around 10 mph becoming west in the afternoon.

    High: 65 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 43. West wind around 5 mph becoming calm in the evening.

    Low: 43 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 47.

    Low: 47 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 53.

    Low: 53 °F

    Partly Cloudy

Detailed Forecast

Tonight
Scattered flurries before 10pm. Cloudy early, then gradual clearing, with a low around 16. Northwest wind 13 to 15 mph, with gusts as high as 29 mph.
Tuesday
Increasing clouds, with a high near 35. Northwest wind 6 to 9 mph becoming southwest in the afternoon.
Tuesday Night
A chance of snow before 4am, then a slight chance of rain. Cloudy, with a low around 32. Southeast wind 7 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 65. South wind around 10 mph becoming west in the afternoon.
Wednesday Night
Mostly cloudy, with a low around 43. West wind around 5 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 74.
Thursday Night
Partly cloudy, with a low around 47.
Friday
Mostly sunny, with a high near 78.
Friday Night
Partly cloudy, with a low around 53.
Saturday
Sunny, with a high near 78.
Saturday Night
Mostly clear, with a low around 51.
Sunday
Sunny, with a high near 73.
Sunday Night
Mostly cloudy, with a low around 41.
Monday
Mostly sunny, with a high near 56.
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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:
8:56 pm CDT Mar 16, 2026
Forecast Valid:
9pm CDT Mar 16, 2026-6pm CDT Mar 23, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation