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

37°F

3°C

Humidity 100%
Wind Speed Calm
Barometer 30.03 in (1017.1 mb)
Dewpoint 37°F (3°C)
Visibility 0.75 mi
Last update 15 Feb 11:54 pm CST
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Overnight

    Overnight: Patchy fog after 1am. Otherwise, partly cloudy, with a low around 35. Calm wind.

    Low: 35 °F

    Patchy Fog

  • Washington's Birthday

    Washington's Birthday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 65. Light south wind increasing to 5 to 10 mph in the morning.

    High: 65 °F

    Patchy Fog
    then Mostly
    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 43. South wind 6 to 8 mph.

    Low: 43 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 64. South wind 6 to 16 mph, with gusts as high as 25 mph.

    High: 64 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 56. South wind 15 to 17 mph, with gusts as high as 29 mph.

    Low: 56 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy

  • Thursday

    Thursday: A slight chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 72. Chance of precipitation is 20%.

    High: 72 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 40.

    Low: 40 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

Detailed Forecast

Overnight
Patchy fog after 1am. Otherwise, partly cloudy, with a low around 35. Calm wind.
Washington's Birthday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 65. Light south wind increasing to 5 to 10 mph in the morning.
Monday Night
Partly cloudy, with a low around 43. South wind 6 to 8 mph.
Tuesday
Mostly cloudy, with a high near 64. South wind 6 to 16 mph, with gusts as high as 25 mph.
Tuesday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 56. South wind 15 to 17 mph, with gusts as high as 29 mph.
Wednesday
Sunny, with a high near 71.
Wednesday Night
Partly cloudy, with a low around 45.
Thursday
A slight chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 72. Chance of precipitation is 20%.
Thursday Night
A 20 percent chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 40.
Friday
A 20 percent chance of rain after noon. Partly sunny, with a high near 57.
Friday Night
A 30 percent chance of rain. Low around 35.
Saturday
High near 51.
Saturday Night
Low around 32.
Sunday
High near 49.
Basemap Options
Click map to change the forecast location
Loading map...
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:
12:26 am CST Feb 16, 2026
Forecast Valid:
12am CST Feb 16, 2026-6pm CST Feb 22, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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