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

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

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

50°F

10°C

Humidity 86%
Wind Speed NE 6 mph
Barometer 30.33 in (1026.9 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Wind Chill48°F (9°C)
Last update 11 Apr 1:54 am CDT
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Overnight

    Overnight: Mostly clear, with a low around 50. East wind around 6 mph.

    Low: 50 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of showers after 4pm. Partly sunny, with a high near 73. Southeast wind 8 to 10 mph.

    High: 73 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 30 percent chance of showers, mainly before 7pm. Partly cloudy, with a low around 61. Southeast wind 8 to 10 mph.

    Low: 61 °F

    Chance
    Showers then
    Partly Cloudy

  • Sunday

    Sunday: A chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers after 4pm. Increasing clouds, with a high near 82. South wind 8 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 30%.

    High: 82 °F

    Mostly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: Showers likely, with thunderstorms also possible after 7pm. Mostly cloudy, with a low around 66. Southwest wind 11 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.

    High: 86 °F

    Chance
    Showers then
    Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 68.

    Low: 68 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny
    then Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69.

    Low: 69 °F

    Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a low around 50. East wind around 6 mph.
Saturday
A 20 percent chance of showers after 4pm. Partly sunny, with a high near 73. Southeast wind 8 to 10 mph.
Saturday Night
A 30 percent chance of showers, mainly before 7pm. Partly cloudy, with a low around 61. Southeast wind 8 to 10 mph.
Sunday
A chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers after 4pm. Increasing clouds, with a high near 82. South wind 8 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 30%.
Sunday Night
Showers likely, with thunderstorms also possible after 7pm. Mostly cloudy, with a low around 66. Southwest wind 11 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Monday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
Monday Night
Partly cloudy, with a low around 68.
Tuesday
A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69.
Wednesday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 83. Chance of precipitation is 60%.
Wednesday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 64. Chance of precipitation is 70%.
Thursday
Showers and thunderstorms likely. Mostly cloudy, with a high near 80. Chance of precipitation is 60%.
Thursday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 61.
Friday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83.
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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:
1:26 am CDT Apr 11, 2026
Forecast Valid:
2am CDT Apr 11, 2026-6pm CDT Apr 17, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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