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

60°F

16°C

Humidity 96%
Wind Speed Calm
Barometer 29.94 in (1013.5 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 12 Oct 1:54 am CDT
Extended Forecast for

Old Monroe MO

  • Overnight

    Overnight: Partly cloudy, with a low around 64. Calm wind becoming south around 5 mph.

    Low: 64 °F

    Partly Cloudy

  • Columbus Day

    Columbus Day: Sunny, with a high near 93. Southwest wind 6 to 13 mph, with gusts as high as 20 mph.

    High: 93 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 70. Southwest wind around 7 mph.

    Low: 70 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 95. Heat index values as high as 103. Southwest wind 5 to 9 mph.

    High: 95 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 70. Light and variable wind becoming south around 6 mph. Chance of precipitation is 70%.

    Low: 70 °F

    Partly Cloudy
    then Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm before 10am, then showers between 10am and 1pm, then showers and possibly a thunderstorm after 1pm. High near 81. Chance of precipitation is 100%.

    High: 81 °F

    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.

    Low: 64 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 79. Chance of precipitation is 90%.

    High: 79 °F

    Showers

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 50.

    Low: 50 °F

    Chance
    Showers

Detailed Forecast

Overnight
Partly cloudy, with a low around 64. Calm wind becoming south around 5 mph.
Columbus Day
Sunny, with a high near 93. Southwest wind 6 to 13 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 70. Southwest wind around 7 mph.
Tuesday
Sunny, with a high near 95. Heat index values as high as 103. Southwest wind 5 to 9 mph.
Tuesday Night
Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 70. Light and variable wind becoming south around 6 mph. Chance of precipitation is 70%.
Wednesday
Showers and possibly a thunderstorm before 10am, then showers between 10am and 1pm, then showers and possibly a thunderstorm after 1pm. High near 81. Chance of precipitation is 100%.
Wednesday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. Chance of precipitation is 60%.
Thursday
Showers and possibly a thunderstorm. High near 79. Chance of precipitation is 90%.
Thursday Night
A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 50.
Friday
Mostly sunny, with a high near 63. Breezy.
Friday Night
Mostly clear, with a low around 38.
Saturday
Sunny, with a high near 63.
Saturday Night
Clear, with a low around 38.
Sunday
Sunny, with a high near 71.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Old Monroe MO
 38.94°N 90.76°W (Elev. 499 ft)
Last Update:
1:41 am CDT Oct 12, 2026
Forecast Valid:
2am CDT Oct 12, 2026-6pm CDT Oct 18, 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