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

69°F

21°C

Humidity 44%
Wind Speed SW 14 G 24 mph
Barometer 30.11 in (1019.0 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 10 Apr 12:54 am CDT
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Overnight

    Overnight: A 30 percent chance of showers, mainly after 5am. Mostly cloudy, with a low around 62. Southwest wind 9 to 14 mph, with gusts as high as 21 mph.

    Low: 62 °F

    Chance
    Showers

  • Friday

    Friday: Showers and thunderstorms before 4pm, then a chance of showers. High near 69. Southwest wind 7 to 10 mph becoming north in the afternoon. Chance of precipitation is 80%.

    High: 69 °F

    Showers

  • Friday Night

    Friday Night: A slight chance of showers before 10pm, then a slight chance of showers after 3am. Mostly cloudy, with a low around 51. East wind around 6 mph. Chance of precipitation is 20%.

    Low: 51 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 72. Southeast wind 6 to 10 mph. Chance of precipitation is 40%.

    High: 72 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 61. Southeast wind around 9 mph.

    Low: 61 °F

    Mostly Cloudy

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 80.

    High: 80 °F

    Partly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.

    Low: 64 °F

    Chance
    Showers

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 86.

    High: 86 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 68.

    Low: 68 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

Detailed Forecast

Overnight
A 30 percent chance of showers, mainly after 5am. Mostly cloudy, with a low around 62. Southwest wind 9 to 14 mph, with gusts as high as 21 mph.
Friday
Showers and thunderstorms before 4pm, then a chance of showers. High near 69. Southwest wind 7 to 10 mph becoming north in the afternoon. Chance of precipitation is 80%.
Friday Night
A slight chance of showers before 10pm, then a slight chance of showers after 3am. Mostly cloudy, with a low around 51. East wind around 6 mph. Chance of precipitation is 20%.
Saturday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 72. Southeast wind 6 to 10 mph. Chance of precipitation is 40%.
Saturday Night
Mostly cloudy, with a low around 61. Southeast wind around 9 mph.
Sunday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 80.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Monday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 86.
Monday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 68.
Tuesday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 88.
Tuesday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Wednesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 82.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 59.
Thursday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 81.
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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:
1:26 am CDT Apr 10, 2026
Forecast Valid:
1am CDT Apr 10, 2026-6pm CDT Apr 16, 2026
 
Forecast Discussion
 
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Additional Resources

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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