National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

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

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

72°F

22°C

Humidity 31%
Wind Speed S 16 mph
Barometer 30.03 in (1016.8 mb)
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Last update 29 Mar 4:54 pm CDT
Extended Forecast for

4 Miles E Portage Des Sioux MO

Red Flag Warning until March 29, 07:00pm
Click here for hazard details and duration
Red Flag Warning
  •  
    Red Flag Warning until March 29, 07:00pm

    NOW until 7:00pm Sun

    Red Flag Warning

  • This Afternoon

    High: 68 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 58. South wind 8 to 10 mph, with gusts as high as 21 mph.

    Low: 58 °F

    Mostly Cloudy

  • Monday

    Monday: Sunny, with a high near 85. Southwest wind 10 to 16 mph, with gusts as high as 25 mph.

    High: 85 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 64. South wind around 14 mph, with gusts as high as 24 mph.

    Low: 64 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of rain, then a chance of rain and thunderstorms after 10am. Partly sunny, with a high near 86. South wind 14 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 40%.

    High: 86 °F

    Slight Chance
    T-storms then
    Chance Rain

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 55. Chance of precipitation is 80%.

    Low: 55 °F

    Rain

  • Wednesday

    Wednesday: Rain and possibly a thunderstorm. High near 67. Chance of precipitation is 80%.

    High: 67 °F

    Rain

  • Wednesday Night

    Wednesday Night: Rain and possibly a thunderstorm. Low around 51. Chance of precipitation is 90%.

    Low: 51 °F

    Rain

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 68. South wind around 14 mph, with gusts as high as 21 mph.
Tonight
Mostly cloudy, with a low around 58. South wind 8 to 10 mph, with gusts as high as 21 mph.
Monday
Sunny, with a high near 85. Southwest wind 10 to 16 mph, with gusts as high as 25 mph.
Monday Night
Partly cloudy, with a low around 64. South wind around 14 mph, with gusts as high as 24 mph.
Tuesday
A slight chance of rain, then a chance of rain and thunderstorms after 10am. Partly sunny, with a high near 86. South wind 14 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 40%.
Tuesday Night
Rain and possibly a thunderstorm. Low around 55. Chance of precipitation is 80%.
Wednesday
Rain and possibly a thunderstorm. High near 67. Chance of precipitation is 80%.
Wednesday Night
Rain and possibly a thunderstorm. Low around 51. Chance of precipitation is 90%.
Thursday
Rain. High near 66. Chance of precipitation is 80%.
Thursday Night
Rain likely, mainly before 1am. Mostly cloudy, with a low around 47. Chance of precipitation is 60%.
Friday
A 40 percent chance of rain. Mostly cloudy, with a high near 74.
Friday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 56.
Saturday
Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 72. Chance of precipitation is 70%.
Saturday Night
Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 47. Chance of precipitation is 60%.
Sunday
A 30 percent chance of rain. Partly sunny, with a high near 61.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Portage Des Sioux MO
 38.93°N 90.27°W (Elev. 407 ft)
Last Update:
2:56 pm CDT Mar 29, 2026
Forecast Valid:
5pm CDT Mar 29, 2026-6pm CDT Apr 5, 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