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

73°F

23°C

Humidity 57%
Wind Speed S 17 mph
Barometer 29.87 in (1010.9 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 31 Mar 8:54 am CDT
Extended Forecast for

3 Miles SSW Dow IL

  • Today

    Today: A 30 percent chance of rain and thunderstorms, mainly after 4pm. Mostly cloudy, with a high near 83. Breezy, with a southwest wind 17 to 21 mph, with gusts as high as 31 mph.

    High: 83 °F

    Chance
    T-storms and
    Breezy

  • Tonight

    Tonight: Rain and thunderstorms before 2am, then rain likely and possibly a thunderstorm between 2am and 3am, then a chance of rain and thunderstorms after 3am. Low around 57. Southwest wind 6 to 11 mph becoming west after midnight. Chance of precipitation is 80%.

    Low: 57 °F

    Rain

  • Wednesday

    Wednesday: Rain and possibly a thunderstorm. High near 70. Southeast wind 7 to 11 mph. Chance of precipitation is 90%.

    High: 70 °F

    Rain

  • Wednesday Night

    Wednesday Night: A chance of rain and thunderstorms before 10pm, then a chance of rain between 10pm and 1am, then a chance of rain and thunderstorms after 1am. Mostly cloudy, with a low around 62. Southeast wind 10 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 50%.

    Low: 62 °F

    Chance Rain
    then Chance
    T-storms

  • Thursday

    Thursday: Rain and possibly a thunderstorm. High near 76. Breezy, with a south wind 16 to 23 mph, with gusts as high as 33 mph. Chance of precipitation is 90%.

    High: 76 °F

    Rain and
    Breezy

  • Thursday Night

    Thursday Night: Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 57. Chance of precipitation is 70%.

    Low: 57 °F

    Rain Likely

  • Friday

    Friday: A chance of rain, with thunderstorms also possible after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 40%.

    High: 80 °F

    Chance Rain
    then Chance
    T-storms

  • Friday Night

    Friday Night: A chance of rain and thunderstorms, then rain likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 57. Chance of precipitation is 70%.

    Low: 57 °F

    Chance
    T-storms then
    Rain Likely

  • Saturday

    Saturday: Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 67. Breezy. Chance of precipitation is 70%.

    High: 67 °F

    Rain Likely
    and Breezy

Detailed Forecast

Today
A 30 percent chance of rain and thunderstorms, mainly after 4pm. Mostly cloudy, with a high near 83. Breezy, with a southwest wind 17 to 21 mph, with gusts as high as 31 mph.
Tonight
Rain and thunderstorms before 2am, then rain likely and possibly a thunderstorm between 2am and 3am, then a chance of rain and thunderstorms after 3am. Low around 57. Southwest wind 6 to 11 mph becoming west after midnight. Chance of precipitation is 80%.
Wednesday
Rain and possibly a thunderstorm. High near 70. Southeast wind 7 to 11 mph. Chance of precipitation is 90%.
Wednesday Night
A chance of rain and thunderstorms before 10pm, then a chance of rain between 10pm and 1am, then a chance of rain and thunderstorms after 1am. Mostly cloudy, with a low around 62. Southeast wind 10 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 50%.
Thursday
Rain and possibly a thunderstorm. High near 76. Breezy, with a south wind 16 to 23 mph, with gusts as high as 33 mph. Chance of precipitation is 90%.
Thursday Night
Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 57. Chance of precipitation is 70%.
Friday
A chance of rain, with thunderstorms also possible after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 40%.
Friday Night
A chance of rain and thunderstorms, then rain likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 57. Chance of precipitation is 70%.
Saturday
Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 67. Breezy. Chance of precipitation is 70%.
Saturday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 38.
Sunday
A 20 percent chance of rain. Mostly sunny, with a high near 56.
Sunday Night
Mostly clear, with a low around 34.
Monday
Sunny, with a high near 61.
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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:
5:51 am CDT Mar 31, 2026
Forecast Valid:
9am CDT Mar 31, 2026-6pm CDT Apr 6, 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