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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

76°F

24°C

Humidity 69%
Wind Speed S 18 G 28 mph
Barometer 29.87 in (1011.0 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 17 May 9:54 am CDT
Extended Forecast for

Portage Des Sioux MO

  • Today

    Today: Cloudy early, then gradual clearing, with a high near 90. Breezy, with a south wind 13 to 20 mph, with gusts as high as 28 mph.

    High: 90 °F

    Mostly Cloudy
    then
    Decreasing
    Clouds and
    Breezy

  • Tonight

    Tonight: Increasing clouds, with a low around 71. South wind 13 to 16 mph, with gusts as high as 25 mph.

    Low: 71 °F

    Increasing
    Clouds

  • Monday

    Monday: A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 11am, then showers likely and possibly a thunderstorm after 11am. Partly sunny, with a high near 88. South wind 14 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.

    High: 88 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 69. South wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    Low: 69 °F

    Partly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 86. South wind 11 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 90%.

    High: 86 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.

    Low: 57 °F

    Showers
    Likely

  • Wednesday

    Wednesday: Partly sunny, with a high near 70.

    High: 70 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 51.

    Low: 51 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 73.

    High: 73 °F

    Partly Sunny

Detailed Forecast

Today
Cloudy early, then gradual clearing, with a high near 90. Breezy, with a south wind 13 to 20 mph, with gusts as high as 28 mph.
Tonight
Increasing clouds, with a low around 71. South wind 13 to 16 mph, with gusts as high as 25 mph.
Monday
A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 11am, then showers likely and possibly a thunderstorm after 11am. Partly sunny, with a high near 88. South wind 14 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.
Monday Night
A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 69. South wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Tuesday
Showers and possibly a thunderstorm. High near 86. South wind 11 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 90%.
Tuesday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.
Wednesday
Partly sunny, with a high near 70.
Wednesday Night
A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 51.
Thursday
Partly sunny, with a high near 73.
Thursday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 54.
Friday
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 76.
Friday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 58.
Saturday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 82.
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ABOUT THIS FORECAST

 
Point Forecast:
Portage Des Sioux MO
 38.93°N 90.33°W (Elev. 407 ft)
Last Update:
8:46 am CDT May 17, 2026
Forecast Valid:
10am CDT May 17, 2026-6pm CDT May 23, 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