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

35°F

2°C

Humidity 52%
Wind Speed N 8 mph
Barometer 30.64 in (1037.6 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill28°F (-2°C)
Last update 28 Mar 3:54 am CDT
Extended Forecast for

St. Charles County Smartt Airport MO

Freeze Warning March 28, 04:03am until March 28, 09:00am
Click here for hazard details and duration
...
  •  
    Freeze Warning March 28, 04:03am until March 28, 09:00am

    NOW until 9:00am Sat

    Freeze Warning

  • Today

    High: 56 °F

    Frost then
    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 40. South wind around 10 mph.

    Low: 40 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 70. South wind 8 to 14 mph, with gusts as high as 21 mph.

    High: 70 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 53. South wind around 11 mph.

    Low: 53 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 84. South wind 10 to 17 mph, with gusts as high as 26 mph.

    High: 84 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63.

    Low: 63 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A chance of rain and thunderstorms, then rain likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 83. Chance of precipitation is 60%.

    High: 83 °F

    Chance Rain
    then Rain
    Likely

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 43. Chance of precipitation is 90%.

    Low: 43 °F

    Rain

Detailed Forecast

Today
Widespread frost before 8am. Otherwise, sunny, with a high near 56. Calm wind becoming south 5 to 9 mph in the morning.
Tonight
Partly cloudy, with a low around 40. South wind around 10 mph.
Sunday
Partly sunny, with a high near 70. South wind 8 to 14 mph, with gusts as high as 21 mph.
Sunday Night
Partly cloudy, with a low around 53. South wind around 11 mph.
Monday
Sunny, with a high near 84. South wind 10 to 17 mph, with gusts as high as 26 mph.
Monday Night
Partly cloudy, with a low around 63.
Tuesday
A chance of rain and thunderstorms, then rain likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 83. Chance of precipitation is 60%.
Tuesday Night
Rain and possibly a thunderstorm. Low around 43. Chance of precipitation is 90%.
Wednesday
A 50 percent chance of rain. Cloudy, with a high near 56.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 37.
Thursday
A 50 percent chance of rain. Mostly cloudy, with a high near 56.
Thursday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 41.
Friday
A 40 percent chance of rain. Mostly cloudy, with a high near 69.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
St. Charles County Smartt Airport MO
 38.94°N 90.45°W (Elev. 427 ft)
Last Update:
2:51 am CDT Mar 28, 2026
Forecast Valid:
4am CDT Mar 28, 2026-6pm CDT Apr 3, 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