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

23°F

-5°C

Humidity 78%
Wind Speed Calm
Barometer 30.40 in (1029.7 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Last update 12 Jan 12:54 am CST
Extended Forecast for

4 Miles WNW Old Monroe MO

  • Overnight

    Overnight: Clear, with a low around 24. Calm wind becoming southwest around 5 mph.

    Low: 24 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 51. Southwest wind 5 to 9 mph, with gusts as high as 22 mph.

    High: 51 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 35. Southwest wind 5 to 8 mph.

    Low: 35 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 58. Southwest wind 8 to 15 mph, with gusts as high as 25 mph.

    High: 58 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 36. West wind 7 to 11 mph, with gusts as high as 21 mph.

    Low: 36 °F

    Slight Chance
    Rain then
    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a temperature rising to near 40 by 10am, then falling to around 33 during the remainder of the day. Breezy.

    High: 40 °F⇓

    Mostly Cloudy
    then Mostly
    Cloudy and
    Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 17.

    Low: 17 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 26.

    Low: 26 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Clear, with a low around 24. Calm wind becoming southwest around 5 mph.
Monday
Sunny, with a high near 51. Southwest wind 5 to 9 mph, with gusts as high as 22 mph.
Monday Night
Mostly clear, with a low around 35. Southwest wind 5 to 8 mph.
Tuesday
Increasing clouds, with a high near 58. Southwest wind 8 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 36. West wind 7 to 11 mph, with gusts as high as 21 mph.
Wednesday
Mostly cloudy, with a temperature rising to near 40 by 10am, then falling to around 33 during the remainder of the day. Breezy.
Wednesday Night
Partly cloudy, with a low around 17.
Thursday
Mostly sunny, with a high near 33.
Thursday Night
Mostly cloudy, with a low around 26.
Friday
Partly sunny, with a high near 42.
Friday Night
Mostly cloudy, with a low around 21.
Saturday
Mostly cloudy, with a high near 30.
Saturday Night
Partly cloudy, with a low around 13.
Sunday
Mostly sunny, with a high near 32.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WNW Old Monroe MO
 38.94°N 90.82°W (Elev. 525 ft)
Last Update:
12:31 am CST Jan 12, 2026
Forecast Valid:
1am CST Jan 12, 2026-6pm CST Jan 18, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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