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.

Fog/Mist

47°F

8°C

Humidity 93%
Wind Speed Calm
Barometer 30.09 in (1018.9 mb)
Dewpoint 45°F (7°C)
Visibility 4.00 mi
Last update 4 Mar 7:54 am CST
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Today

    Today: Showers and thunderstorms before 3pm, then showers and possibly a thunderstorm, mainly after 3pm. Patchy fog before 1pm. High near 60. Northeast wind around 6 mph becoming south in the afternoon. Chance of precipitation is 90%.

    High: 60 °F

    Chance
    Showers and
    Patchy Fog
    then Showers
    and Patchy
    Fog

  • Tonight

    Tonight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Patchy fog after 8pm. Low around 52. East wind around 6 mph becoming northwest after midnight. Chance of precipitation is 80%.

    Low: 52 °F

    Showers and
    Patchy Fog

  • Thursday

    Thursday: A 50 percent chance of showers, mainly before noon. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 66. West wind 5 to 9 mph becoming light and variable in the afternoon.

    High: 66 °F

    Chance
    Showers and
    Patchy Fog
    then Slight
    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before midnight, then showers likely and possibly a thunderstorm between midnight and 3am, then showers likely after 3am. Mostly cloudy, with a low around 57. South wind 3 to 8 mph. Chance of precipitation is 60%.

    Low: 57 °F

    Chance
    Showers then
    Showers
    Likely

  • Friday

    Friday: A 50 percent chance of showers. Partly sunny, with a high near 79. South wind 9 to 18 mph, with gusts as high as 28 mph.

    High: 79 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 53. Chance of precipitation is 90%.

    Low: 53 °F

    Showers
    Likely then
    Showers

  • Saturday

    Saturday: A 40 percent chance of showers before noon. Partly sunny, with a high near 64.

    High: 64 °F

    Chance
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

Detailed Forecast

Today
Showers and thunderstorms before 3pm, then showers and possibly a thunderstorm, mainly after 3pm. Patchy fog before 1pm. High near 60. Northeast wind around 6 mph becoming south in the afternoon. Chance of precipitation is 90%.
Tonight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Patchy fog after 8pm. Low around 52. East wind around 6 mph becoming northwest after midnight. Chance of precipitation is 80%.
Thursday
A 50 percent chance of showers, mainly before noon. Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 66. West wind 5 to 9 mph becoming light and variable in the afternoon.
Thursday Night
A chance of showers and thunderstorms before midnight, then showers likely and possibly a thunderstorm between midnight and 3am, then showers likely after 3am. Mostly cloudy, with a low around 57. South wind 3 to 8 mph. Chance of precipitation is 60%.
Friday
A 50 percent chance of showers. Partly sunny, with a high near 79. South wind 9 to 18 mph, with gusts as high as 28 mph.
Friday Night
Showers and possibly a thunderstorm. Low around 53. Chance of precipitation is 90%.
Saturday
A 40 percent chance of showers before noon. Partly sunny, with a high near 64.
Saturday Night
Partly cloudy, with a low around 40.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 48.
Monday
Sunny, with a high near 78.
Monday Night
A 30 percent chance of showers and thunderstorms. Mostly clear, with a low around 60.
Tuesday
Showers and thunderstorms likely. Mostly cloudy, with a high near 77. Chance of precipitation is 70%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Portage Des Sioux MO
 38.93°N 90.27°W (Elev. 407 ft)
Last Update:
4:36 am CST Mar 4, 2026
Forecast Valid:
8am CST Mar 4, 2026-6pm CDT Mar 10, 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