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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 Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Overcast

66°F

19°C

Humidity 92%
Wind Speed Calm
Barometer 29.98 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 19 May 4:15 am CDT
Extended Forecast for

2 Miles NNW Granite City IL

Flood Watch May 19, 04:34am until May 19, 01:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch May 19, 04:34am until May 19, 01:00pm

    NOW until 1:00pm Tue

    Flood Watch

  • Overnight

    Low: 65 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers and thunderstorms before 7am, then showers and possibly a thunderstorm between 7am and 8am, then a chance of showers and thunderstorms after 8am. High near 77. South wind 8 to 13 mph becoming west in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 80%.

    High: 77 °F

    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 4am, then a slight chance of showers. Cloudy, with a low around 57. North wind around 9 mph. Chance of precipitation is 40%.

    Low: 57 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Partly sunny, with a high near 71. North wind 8 to 10 mph.

    High: 71 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 52. Northeast wind 6 to 8 mph.

    Low: 52 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 73.

    High: 73 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: A 50 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 58.

    Low: 58 °F

    Slight Chance
    Showers then
    Chance
    Showers

  • Friday

    Friday: Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. High near 74. Chance of precipitation is 80%.

    High: 74 °F

    Showers

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. South wind around 8 mph.
Tuesday
A chance of showers and thunderstorms before 7am, then showers and possibly a thunderstorm between 7am and 8am, then a chance of showers and thunderstorms after 8am. High near 77. South wind 8 to 13 mph becoming west in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 80%.
Tuesday Night
A chance of showers and thunderstorms before 4am, then a slight chance of showers. Cloudy, with a low around 57. North wind around 9 mph. Chance of precipitation is 40%.
Wednesday
Partly sunny, with a high near 71. North wind 8 to 10 mph.
Wednesday Night
Mostly cloudy, with a low around 52. Northeast wind 6 to 8 mph.
Thursday
Mostly cloudy, with a high near 73.
Thursday Night
A 50 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 58.
Friday
Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. High near 74. Chance of precipitation is 80%.
Friday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 59.
Saturday
Partly sunny, with a high near 81.
Saturday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 61.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 84.
Sunday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Memorial Day
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 86.
Basemap Options
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Granite City IL
 38.73°N 90.14°W (Elev. 407 ft)
Last Update:
2:11 am CDT May 19, 2026
Forecast Valid:
4am CDT May 19, 2026-6pm CDT May 25, 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