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.

Mostly Cloudy

60°F

16°C

Humidity 93%
Wind Speed SW 12 mph
Barometer 29.87 in (1011.1 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 7 Mar 8:54 am CST
Extended Forecast for

2 Miles SSE Portage Des Sioux MO

  • Today

    Today: A 30 percent chance of rain before 10am. Cloudy, with a temperature falling to around 47 by 5pm. Breezy, with a southwest wind 11 to 20 mph becoming northwest in the afternoon.

    High: 64 °F⇓

    Chance Rain
    then Mostly
    Cloudy and
    Breezy

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 36. Northwest wind 5 to 10 mph becoming light west after midnight.

    Low: 36 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 66. Light southwest wind increasing to 5 to 10 mph in the morning.

    High: 66 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 46. South wind around 7 mph.

    Low: 46 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 79. Southwest wind 7 to 14 mph, with gusts as high as 23 mph.

    High: 79 °F

    Sunny

  • Monday Night

    Monday Night: A 30 percent chance of rain after midnight. Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear
    then Chance
    Rain

  • Tuesday

    Tuesday: A chance of rain and thunderstorms, then rain and possibly a thunderstorm after noon. High near 80. Chance of precipitation is 80%.

    High: 80 °F

    Chance Rain
    then Rain

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 51. Chance of precipitation is 90%.

    Low: 51 °F

    Rain

  • Wednesday

    Wednesday: Rain and possibly a thunderstorm before noon, then a chance of rain. High near 64. Breezy. Chance of precipitation is 80%.

    High: 64 °F

    Breezy. Rain
    then Chance
    Rain

Detailed Forecast

Today
A 30 percent chance of rain before 10am. Cloudy, with a temperature falling to around 47 by 5pm. Breezy, with a southwest wind 11 to 20 mph becoming northwest in the afternoon.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 36. Northwest wind 5 to 10 mph becoming light west after midnight.
Sunday
Sunny, with a high near 66. Light southwest wind increasing to 5 to 10 mph in the morning.
Sunday Night
Clear, with a low around 46. South wind around 7 mph.
Monday
Sunny, with a high near 79. Southwest wind 7 to 14 mph, with gusts as high as 23 mph.
Monday Night
A 30 percent chance of rain after midnight. Mostly clear, with a low around 57.
Tuesday
A chance of rain and thunderstorms, then rain and possibly a thunderstorm after noon. High near 80. Chance of precipitation is 80%.
Tuesday Night
Rain and possibly a thunderstorm. Low around 51. Chance of precipitation is 90%.
Wednesday
Rain and possibly a thunderstorm before noon, then a chance of rain. High near 64. Breezy. Chance of precipitation is 80%.
Wednesday Night
Partly cloudy, with a low around 33.
Thursday
Mostly sunny, with a high near 55.
Thursday Night
Mostly cloudy, with a low around 41.
Friday
Mostly cloudy, with a high near 67.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSE Portage Des Sioux MO
 38.91°N 90.33°W (Elev. 427 ft)
Last Update:
8:51 am CST Mar 7, 2026
Forecast Valid:
9am CST Mar 7, 2026-6pm CDT Mar 13, 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