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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. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

67°F

19°C

Humidity 87%
Wind Speed S 14 mph
Barometer 29.95 in (1013.7 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 19 May 1:54 am CDT
Extended Forecast for

5 Miles SSW St. Charles County Smartt Airport MO

Flood Watch May 19, 02:45am until May 19, 01:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch May 19, 02:45am 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 6 to 14 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 1am, then a slight chance of showers. Mostly cloudy, with a low around 55. North wind around 10 mph. Chance of precipitation is 40%.

    Low: 55 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Partly sunny, with a high near 70. Northeast wind 9 to 11 mph.

    High: 70 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 51. Northeast wind around 8 mph.

    Low: 51 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 72.

    High: 72 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Showers likely, mainly after 1am. Cloudy, with a low around 56. Chance of precipitation is 60%.

    Low: 56 °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 7 to 10 mph.
Tuesday
Showers and possibly a thunderstorm, mainly before 9am, then a chance of showers and thunderstorms after 9am. High near 77. South wind 6 to 14 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 1am, then a slight chance of showers. Mostly cloudy, with a low around 55. North wind around 10 mph. Chance of precipitation is 40%.
Wednesday
Partly sunny, with a high near 70. Northeast wind 9 to 11 mph.
Wednesday Night
Mostly cloudy, with a low around 51. Northeast wind around 8 mph.
Thursday
Mostly cloudy, with a high near 72.
Thursday Night
Showers likely, mainly after 1am. Cloudy, with a low around 56. 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 57.
Saturday
Partly sunny, with a high near 80.
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. Partly sunny, with a high near 84.
Sunday Night
A 20 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 86.
Basemap Options
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SSW St. Charles County Smartt Airport MO
 38.87°N 90.48°W (Elev. 436 ft)
Last Update:
2:11 am CDT May 19, 2026
Forecast Valid:
2am 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