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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 Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Light Rain

68°F

20°C

Humidity 93%
Wind Speed W 13 mph
Barometer 30.00 in (1015.2 mb)
Dewpoint 66°F (19°C)
Visibility 9.00 mi
Last update 19 May 4:51 am CDT
Extended Forecast for

Saint Charles MO

Flood Watch May 19, 05:25am until May 19, 01:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch May 19, 05:25am until May 19, 01:00pm

    NOW until 1:00pm Tue

    Flood Watch

  • Overnight

    Low: 65 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm, mainly before 9am, then a chance of showers and thunderstorms after 9am. High near 77. South wind 7 to 11 mph becoming west in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 90%.

    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. Mostly cloudy, with a low around 55. North wind 8 to 10 mph. Chance of precipitation is 40%.

    Low: 55 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Partly sunny, with a high near 69. North wind 7 to 10 mph.

    High: 69 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 52. Northeast wind around 7 mph.

    Low: 52 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 71.

    High: 71 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Showers likely, mainly after 1am. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.

    Low: 57 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Friday

    Friday: Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. High near 72. Chance of precipitation is 80%.

    High: 72 °F

    Showers

Detailed Forecast

Overnight
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65. South wind around 8 mph.
Tuesday
Showers and possibly a thunderstorm, mainly before 9am, then a chance of showers and thunderstorms after 9am. High near 77. South wind 7 to 11 mph becoming west in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 90%.
Tuesday Night
A chance of showers and thunderstorms before 4am, then a slight chance of showers. Mostly cloudy, with a low around 55. North wind 8 to 10 mph. Chance of precipitation is 40%.
Wednesday
Partly sunny, with a high near 69. North wind 7 to 10 mph.
Wednesday Night
Mostly cloudy, with a low around 52. Northeast wind around 7 mph.
Thursday
Mostly cloudy, with a high near 71.
Thursday Night
Showers likely, mainly after 1am. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.
Friday
Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. High near 72. Chance of precipitation is 80%.
Friday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 58.
Saturday
Partly sunny, with a high near 79.
Saturday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 60.
Sunday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83.
Sunday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Memorial Day
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 85.
Basemap Options
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Saint Charles MO
 38.78°N 90.51°W (Elev. 597 ft)
Last Update:
5:16 am CDT May 19, 2026
Forecast Valid:
5am 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