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.

Fair

48°F

9°C

Humidity 63%
Wind Speed E 3 mph
Barometer 30.35 in (1027.6 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 20 Apr 7:53 am CDT
Extended Forecast for

Granite City IL

  • Today

    Today: Sunny, with a high near 70. Light and variable wind becoming southeast 5 to 7 mph in the morning.

    High: 70 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 51. Southeast wind around 7 mph.

    Low: 51 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 81. Southwest wind 7 to 14 mph, with gusts as high as 23 mph.

    High: 81 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 59. Southwest wind 7 to 10 mph.

    Low: 59 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 79. Southwest wind 6 to 8 mph.

    High: 79 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 63. Chance of precipitation is 70%.

    Low: 63 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. High near 76. Chance of precipitation is 80%.

    High: 76 °F

    Showers

Detailed Forecast

Today
Sunny, with a high near 70. Light and variable wind becoming southeast 5 to 7 mph in the morning.
Tonight
Mostly clear, with a low around 51. Southeast wind around 7 mph.
Tuesday
Sunny, with a high near 81. Southwest wind 7 to 14 mph, with gusts as high as 23 mph.
Tuesday Night
Mostly clear, with a low around 59. Southwest wind 7 to 10 mph.
Wednesday
Sunny, with a high near 79. Southwest wind 6 to 8 mph.
Wednesday Night
Mostly clear, with a low around 59.
Thursday
Mostly sunny, with a high near 82.
Thursday Night
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 63. Chance of precipitation is 70%.
Friday
Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. High near 76. Chance of precipitation is 80%.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 54.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 73.
Saturday Night
A 30 percent chance of showers. Partly cloudy, with a low around 52.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 73.
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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:
6:01 am CDT Apr 20, 2026
Forecast Valid:
7am CDT Apr 20, 2026-6pm CDT Apr 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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