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

Hazardous Weather Conditions

Current conditions at

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

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair and Breezy

79°F

26°C

Humidity 42%
Wind Speed S 23 G 35 mph
Barometer 30.00 in (1015.5 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 12 Apr 11:54 am CDT
Extended Forecast for

3 Miles SSW Dow IL

  • This Afternoon

    This Afternoon: A chance of showers and thunderstorms. Increasing clouds, with a high near 80. Breezy, with a south wind around 21 mph, with gusts as high as 32 mph. Chance of precipitation is 40%.

    High: 80 °F

    Chance
    Showers and
    Breezy

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms, mainly before midnight. Mostly cloudy, with a low around 66. Southwest wind 13 to 18 mph, with gusts as high as 28 mph.

    Low: 66 °F

    Chance
    T-storms then
    Slight Chance
    T-storms

  • Monday

    Monday: Partly sunny, with a high near 85. South wind 10 to 17 mph, with gusts as high as 26 mph.

    High: 85 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 67. South wind 13 to 16 mph, with gusts as high as 24 mph.

    Low: 67 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Partly sunny, with a high near 87. Southwest wind 11 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    High: 87 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.

    Low: 67 °F

    Chance
    T-storms

  • Wednesday

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

    High: 80 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 63. Chance of precipitation is 70%.

    Low: 63 °F

    Showers
    Likely

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. Chance of precipitation is 30%.

    High: 82 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
A chance of showers and thunderstorms. Increasing clouds, with a high near 80. Breezy, with a south wind around 21 mph, with gusts as high as 32 mph. Chance of precipitation is 40%.
Tonight
A 50 percent chance of showers and thunderstorms, mainly before midnight. Mostly cloudy, with a low around 66. Southwest wind 13 to 18 mph, with gusts as high as 28 mph.
Monday
Partly sunny, with a high near 85. South wind 10 to 17 mph, with gusts as high as 26 mph.
Monday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 67. South wind 13 to 16 mph, with gusts as high as 24 mph.
Tuesday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Partly sunny, with a high near 87. Southwest wind 11 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Wednesday
Showers and possibly a thunderstorm. High near 80. Chance of precipitation is 80%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 63. Chance of precipitation is 70%.
Thursday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. Chance of precipitation is 30%.
Thursday Night
Mostly clear, with a low around 60.
Friday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
Friday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 62. Chance of precipitation is 70%.
Saturday
Showers and thunderstorms likely. Partly sunny, with a high near 77. Chance of precipitation is 60%.
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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:
12:11 pm CDT Apr 12, 2026
Forecast Valid:
12pm CDT Apr 12, 2026-6pm CDT Apr 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