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 Rain

39°F

4°C

Humidity 86%
Wind Speed N 12 G 26 mph
Barometer 30.25 in (1024.1 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 27 Mar 6:53 am CDT
Extended Forecast for

Granite City IL

  • Today

    Today: A 30 percent chance of showers, mainly before 8am. Cloudy, then gradually becoming mostly sunny, with a high near 52. North wind 15 to 17 mph, with gusts as high as 33 mph.

    High: 52 °F

    Chance
    Showers then
    Partly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 30. North wind 5 to 13 mph, with gusts as high as 20 mph.

    Low: 30 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 56. Calm wind becoming south 5 to 8 mph in the morning.

    High: 56 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 41. South wind 6 to 8 mph.

    Low: 41 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 69. South wind 7 to 13 mph, with gusts as high as 20 mph.

    High: 69 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A 20 percent chance of rain and thunderstorms after 1am. Mostly cloudy, with a low around 65.

    Low: 65 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Tuesday

    Tuesday: A 20 percent chance of rain. Partly sunny, with a high near 86.

    High: 86 °F

    Slight Chance
    Rain

Detailed Forecast

Today
A 30 percent chance of showers, mainly before 8am. Cloudy, then gradually becoming mostly sunny, with a high near 52. North wind 15 to 17 mph, with gusts as high as 33 mph.
Tonight
Mostly clear, with a low around 30. North wind 5 to 13 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 56. Calm wind becoming south 5 to 8 mph in the morning.
Saturday Night
Partly cloudy, with a low around 41. South wind 6 to 8 mph.
Sunday
Partly sunny, with a high near 69. South wind 7 to 13 mph, with gusts as high as 20 mph.
Sunday Night
Partly cloudy, with a low around 58.
Monday
Mostly sunny, with a high near 83.
Monday Night
A 20 percent chance of rain and thunderstorms after 1am. Mostly cloudy, with a low around 65.
Tuesday
A 20 percent chance of rain. Partly sunny, with a high near 86.
Tuesday Night
A 50 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 63.
Wednesday
A 50 percent chance of rain and thunderstorms. Mostly cloudy, with a high near 77.
Wednesday Night
Rain and thunderstorms likely. Mostly cloudy, with a low around 55. Chance of precipitation is 70%.
Thursday
Rain and thunderstorms likely. Mostly cloudy, with a high near 68. Chance of precipitation is 60%.
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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:
7:36 am CDT Mar 27, 2026
Forecast Valid:
7am CDT Mar 27, 2026-6pm CDT Apr 2, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation