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

61°F

16°C

Humidity 29%
Wind Speed W 17 G 25 mph
Barometer 30.23 in (1023.7 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 19 Apr 11:54 am CDT
Extended Forecast for

3 Miles SSW Dow IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 65. West wind around 17 mph, with gusts as high as 26 mph.

    High: 65 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 39. Northwest wind 6 to 10 mph becoming northeast after midnight.

    Low: 39 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 67. East wind 6 to 8 mph becoming south in the afternoon.

    High: 67 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 50. Southeast wind around 10 mph.

    Low: 50 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 78. Southwest wind 10 to 16 mph, with gusts as high as 25 mph.

    High: 78 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 65. West wind around 17 mph, with gusts as high as 26 mph.
Tonight
Partly cloudy, with a low around 39. Northwest wind 6 to 10 mph becoming northeast after midnight.
Monday
Sunny, with a high near 67. East wind 6 to 8 mph becoming south in the afternoon.
Monday Night
Mostly clear, with a low around 50. Southeast wind around 10 mph.
Tuesday
Sunny, with a high near 78. Southwest wind 10 to 16 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly clear, with a low around 56.
Wednesday
Sunny, with a high near 78.
Wednesday Night
Mostly clear, with a low around 59.
Thursday
Mostly sunny, with a high near 82.
Thursday Night
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 62. Chance of precipitation is 60%.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 74. Chance of precipitation is 70%.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 48.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 68.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSW Dow IL
 39°N 90.33°W (Elev. 597 ft)
Last Update:
11:51 am CDT Apr 19, 2026
Forecast Valid:
12pm CDT Apr 19, 2026-6pm CDT Apr 25, 2026
 
Forecast Discussion
 
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Additional Resources

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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