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.

Rain

48°F

9°C

Humidity 83%
Wind Speed Vrbl 6 mph
Barometer 29.82 in (1009.4 mb)
Dewpoint 43°F (6°C)
Visibility 6.00 mi
Wind Chill45°F (7°C)
Last update 18 Apr 4:54 am CDT
Extended Forecast for

4 Miles E Portage Des Sioux MO

  • Overnight

    Overnight: A 50 percent chance of showers. Cloudy, with a steady temperature around 52. Northwest wind around 14 mph, with gusts as high as 23 mph.

    Low: 52 °F

    Chance
    Showers

  • Saturday

    Saturday: A 30 percent chance of showers, mainly before 7am. Cloudy through mid morning, then gradual clearing, with a high near 58. Northwest wind around 17 mph, with gusts as high as 25 mph.

    High: 58 °F

    Chance
    Showers then
    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 40. Northwest wind 6 to 11 mph becoming light west after midnight.

    Low: 40 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 67. Light west wind increasing to 11 to 16 mph in the morning. Winds could gust as high as 25 mph.

    High: 67 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 40. Northwest wind 5 to 9 mph becoming light and variable after midnight.

    Low: 40 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 68.

    High: 68 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 51.

    Low: 51 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 57.

    Low: 57 °F

    Slight Chance
    T-storms

Detailed Forecast

Overnight
A 50 percent chance of showers. Cloudy, with a steady temperature around 52. Northwest wind around 14 mph, with gusts as high as 23 mph.
Saturday
A 30 percent chance of showers, mainly before 7am. Cloudy through mid morning, then gradual clearing, with a high near 58. Northwest wind around 17 mph, with gusts as high as 25 mph.
Saturday Night
Clear, with a low around 40. Northwest wind 6 to 11 mph becoming light west after midnight.
Sunday
Sunny, with a high near 67. Light west wind increasing to 11 to 16 mph in the morning. Winds could gust as high as 25 mph.
Sunday Night
Mostly clear, with a low around 40. Northwest wind 5 to 9 mph becoming light and variable after midnight.
Monday
Sunny, with a high near 68.
Monday Night
Mostly clear, with a low around 51.
Tuesday
Mostly sunny, with a high near 79.
Tuesday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 57.
Wednesday
Sunny, with a high near 82.
Wednesday Night
Mostly clear, with a low around 61.
Thursday
Mostly sunny, with a high near 85.
Thursday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 63. Chance of precipitation is 60%.
Friday
Showers and thunderstorms likely. Mostly cloudy, with a high near 78. Chance of precipitation is 60%.
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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:
2:26 am CDT Apr 18, 2026
Forecast Valid:
5am CDT Apr 18, 2026-6pm CDT Apr 24, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation