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.

Fog/Mist

50°F

10°C

Humidity 96%
Wind Speed W 3 mph
Barometer 29.99 in (1015.2 mb)
Dewpoint 49°F (9°C)
Visibility 1.25 mi
Last update 11 Oct 4:54 am CDT
Extended Forecast for

5 Miles W Dow IL

  • Today

    Today: Sunny, with a high near 89. Calm wind becoming south around 5 mph in the afternoon.

    High: 89 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 64. Southeast wind around 6 mph becoming southwest after midnight.

    Low: 64 °F

    Increasing
    Clouds

  • Columbus Day

    Columbus Day: Sunny, with a high near 94. Southwest wind 7 to 15 mph.

    High: 94 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 71. Southwest wind around 10 mph.

    Low: 71 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 94. Southwest wind 8 to 10 mph.

    High: 94 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.

    Low: 68 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 82. Chance of precipitation is 80%.

    High: 82 °F

    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 61. Chance of precipitation is 60%.

    Low: 61 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 77. Chance of precipitation is 80%.

    High: 77 °F

    Showers

Detailed Forecast

Today
Sunny, with a high near 89. Calm wind becoming south around 5 mph in the afternoon.
Tonight
Increasing clouds, with a low around 64. Southeast wind around 6 mph becoming southwest after midnight.
Columbus Day
Sunny, with a high near 94. Southwest wind 7 to 15 mph.
Monday Night
Clear, with a low around 71. Southwest wind around 10 mph.
Tuesday
Sunny, with a high near 94. Southwest wind 8 to 10 mph.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Wednesday
Showers and possibly a thunderstorm. High near 82. Chance of precipitation is 80%.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 61. Chance of precipitation is 60%.
Thursday
Showers and possibly a thunderstorm. High near 77. Chance of precipitation is 80%.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 52.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 68. Breezy.
Friday Night
Partly cloudy, with a low around 40.
Saturday
Sunny, with a high near 61.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles W Dow IL
 39.05°N 90.41°W (Elev. 600 ft)
Last Update:
5:26 am CDT Oct 11, 2026
Forecast Valid:
5am CDT Oct 11, 2026-6pm CDT Oct 17, 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