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

61°F

16°C

Humidity 75%
Wind Speed SE 3 mph
Barometer 30.05 in (1017.3 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 12 Apr 4:54 am CDT
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Today

    Today: A 30 percent chance of showers, mainly after 5pm. Partly sunny, with a high near 82. Breezy, with a south wind 9 to 14 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 82 °F

    Partly Sunny
    then Chance
    Showers and
    Breezy

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 65. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 28 mph.

    Low: 65 °F

    Chance
    T-storms and
    Breezy

  • Monday

    Monday: A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm. Mostly sunny, with a high near 87. South wind 9 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.

    High: 87 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 68. South wind 10 to 15 mph, with gusts as high as 23 mph.

    Low: 68 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Partly sunny, with a high near 88. Southwest wind 9 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    High: 88 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.

    Low: 68 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 81. Chance of precipitation is 80%.

    High: 81 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 63. Chance of precipitation is 70%.

    Low: 63 °F

    Showers
    Likely

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 83. Chance of precipitation is 30%.

    High: 83 °F

    Chance
    Showers

Detailed Forecast

Today
A 30 percent chance of showers, mainly after 5pm. Partly sunny, with a high near 82. Breezy, with a south wind 9 to 14 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 30 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 65. Breezy, with a southwest wind 10 to 20 mph, with gusts as high as 28 mph.
Monday
A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm. Mostly sunny, with a high near 87. South wind 9 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.
Monday Night
Partly cloudy, with a low around 68. South wind 10 to 15 mph, with gusts as high as 23 mph.
Tuesday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Partly sunny, with a high near 88. Southwest wind 9 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
Wednesday
Showers and possibly a thunderstorm. High near 81. Chance of precipitation is 80%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 63. Chance of precipitation is 70%.
Thursday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 83. Chance of precipitation is 30%.
Thursday Night
Mostly clear, with a low around 61.
Friday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Friday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 62. Chance of precipitation is 70%.
Saturday
Showers and thunderstorms likely. Partly sunny, with a high near 79. Chance of precipitation is 60%.
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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:
5:16 am CDT Apr 12, 2026
Forecast Valid:
5am CDT Apr 12, 2026-6pm CDT Apr 18, 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