Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

80°F

27°C

Humidity 34%
Wind Speed SW 10 G 23 mph
Barometer 30.04 in (1017.0 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 21 Apr 1:53 pm CDT
Extended Forecast for

Granite City IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 81. Southwest wind around 15 mph, with gusts as high as 23 mph.

    High: 81 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 59. Southwest wind 7 to 11 mph, with gusts as high as 21 mph.

    Low: 59 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 80. Southwest wind 6 to 9 mph.

    High: 80 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 59. South wind around 6 mph.

    Low: 59 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 83. South wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 28 mph.

    High: 83 °F

    Sunny

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm after 1am.  Mostly cloudy, with a low around 64. Chance of precipitation is 60%.

    Low: 64 °F

    Partly Cloudy
    then Showers
    Likely

  • Friday

    Friday: Showers and possibly a thunderstorm.  High near 79. Chance of precipitation is 80%.

    High: 79 °F

    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms.  Mostly cloudy, with a low around 56. Chance of precipitation is 40%.

    Low: 56 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 81. Southwest wind around 15 mph, with gusts as high as 23 mph.
Tonight
Mostly clear, with a low around 59. Southwest wind 7 to 11 mph, with gusts as high as 21 mph.
Wednesday
Sunny, with a high near 80. Southwest wind 6 to 9 mph.
Wednesday Night
Mostly clear, with a low around 59. South wind around 6 mph.
Thursday
Sunny, with a high near 83. South wind 6 to 11 mph increasing to 12 to 17 mph in the afternoon. Winds could gust as high as 28 mph.
Thursday Night
Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Friday
Showers and possibly a thunderstorm. High near 79. Chance of precipitation is 80%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 56. Chance of precipitation is 40%.
Saturday
Mostly sunny, with a high near 77.
Saturday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 54.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 77.
Sunday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 60. Chance of precipitation is 60%.
Monday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 78. Chance of precipitation is 60%.
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ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.73°N 90.11°W (Elev. 417 ft)
1:25 pm CDT Apr 21, 2026
2pm CDT Apr 21, 2026-6pm CDT Apr 27, 2026
 
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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