National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

48°F

9°C

Humidity 44%
Wind Speed Calm
Barometer 29.78 in (1008.6 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 25 Feb 10:54 am CST
Extended Forecast for

4 Miles NNE Saint Charles MO

  • Today

    Today: Mostly cloudy, with a high near 52. Calm wind becoming north around 5 mph in the afternoon.

    High: 52 °F

    Mostly Cloudy

  • Tonight

    Tonight: A 40 percent chance of rain, mainly before 3am. Mostly cloudy, with a low around 34. Northeast wind around 6 mph.

    Low: 34 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 56. Southeast wind around 6 mph becoming light and variable in the afternoon.

    High: 56 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 34. Light southwest wind.

    Low: 34 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 69. Southwest wind 5 to 11 mph, with gusts as high as 20 mph.

    High: 69 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 41.

    Low: 41 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 61.

    High: 61 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of rain. Partly cloudy, with a low around 30.

    Low: 30 °F

    Slight Chance
    Rain

  • Sunday

    Sunday: A chance of rain before noon, then a chance of rain and snow. Mostly cloudy, with a high near 45. Chance of precipitation is 50%.

    High: 45 °F

    Chance Rain
    then Chance
    Rain/Snow

Detailed Forecast

Today
Mostly cloudy, with a high near 52. Calm wind becoming north around 5 mph in the afternoon.
Tonight
A 40 percent chance of rain, mainly before 3am. Mostly cloudy, with a low around 34. Northeast wind around 6 mph.
Thursday
Mostly sunny, with a high near 56. Southeast wind around 6 mph becoming light and variable in the afternoon.
Thursday Night
Mostly clear, with a low around 34. Light southwest wind.
Friday
Sunny, with a high near 69. Southwest wind 5 to 11 mph, with gusts as high as 20 mph.
Friday Night
Mostly clear, with a low around 41.
Saturday
Mostly sunny, with a high near 61.
Saturday Night
A 20 percent chance of rain. Partly cloudy, with a low around 30.
Sunday
A chance of rain before noon, then a chance of rain and snow. Mostly cloudy, with a high near 45. Chance of precipitation is 50%.
Sunday Night
Rain and snow likely, mainly before midnight. Some thunder is also possible. Mostly cloudy, with a low around 30. Chance of precipitation is 60%.
Monday
A 30 percent chance of rain. Mostly cloudy, with a high near 41.
Monday Night
A 40 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 29.
Tuesday
A 50 percent chance of rain. Mostly cloudy, with a high near 46.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNE Saint Charles MO
 38.85°N 90.51°W (Elev. 436 ft)
Last Update:
10:26 am CST Feb 25, 2026
Forecast Valid:
11am CST Feb 25, 2026-6pm CST Mar 3, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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