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NWS St. Louis Announces Changes To May 16, 2025 Tornado Damage Assessment

After a year-long review of new ground survey data and aerial imagery, NWS St. Louis made several adjustments to the May 16, 2025 tornado damage assessment. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

78°F

26°C

Humidity 60%
Wind Speed S 10 mph
Barometer 29.81 in (1009.3 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 15 May 7:53 pm CDT
Extended Forecast for

Granite City IL

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 5am. Cloudy, then gradually becoming partly cloudy, with a low around 68. South wind around 9 mph, with gusts as high as 20 mph.

    Low: 68 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms likely, mainly between 7am and noon. Mostly cloudy, with a high near 83. West wind 7 to 9 mph becoming south in the afternoon. Chance of precipitation is 70%.

    High: 83 °F

    T-storms
    Likely

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 66. South wind around 8 mph.

    Low: 66 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 91. South wind 9 to 17 mph, with gusts as high as 28 mph.

    High: 91 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 71. South wind 11 to 15 mph, with gusts as high as 23 mph.

    Low: 71 °F

    Mostly Clear

  • Monday

    Monday: A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 92.

    High: 92 °F

    Partly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.

    Low: 71 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 83. Chance of precipitation is 80%.

    High: 83 °F

    Showers
    Likely then
    T-storms

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 61. Chance of precipitation is 70%.

    Low: 61 °F

    Showers
    Likely

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms, mainly after 5am. Cloudy, then gradually becoming partly cloudy, with a low around 68. South wind around 9 mph, with gusts as high as 20 mph.
Saturday
Showers and thunderstorms likely, mainly between 7am and noon. Mostly cloudy, with a high near 83. West wind 7 to 9 mph becoming south in the afternoon. Chance of precipitation is 70%.
Saturday Night
A 20 percent chance of showers and thunderstorms before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 66. South wind around 8 mph.
Sunday
Sunny, with a high near 91. South wind 9 to 17 mph, with gusts as high as 28 mph.
Sunday Night
Mostly clear, with a low around 71. South wind 11 to 15 mph, with gusts as high as 23 mph.
Monday
A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 92.
Monday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Tuesday
Showers and possibly a thunderstorm. High near 83. Chance of precipitation is 80%.
Tuesday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 61. Chance of precipitation is 70%.
Wednesday
A 20 percent chance of showers. Partly sunny, with a high near 73.
Wednesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 55.
Thursday
Mostly sunny, with a high near 75.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 57.
Friday
A 20 percent chance of showers. Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Granite City IL
 38.71°N 90.11°W (Elev. 413 ft)
Last Update:
5:56 pm CDT May 15, 2026
Forecast Valid:
8pm CDT May 15, 2026-6pm CDT May 22, 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