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.

Overcast

46°F

8°C

Humidity 93%
Wind Speed Calm
Barometer 30.08 in (1018.5 mb)
Dewpoint 44°F (7°C)
Visibility 9.00 mi
Last update 4 Mar 2:54 am CST
Extended Forecast for

3 Miles WSW Hardin IL

  • Overnight

    Overnight: A 50 percent chance of showers and thunderstorms. Patchy fog after 4am. Otherwise, cloudy, with a low around 45. Northeast wind around 5 mph.

    Low: 45 °F

    Chance
    T-storms and
    Patchy Fog

  • Wednesday

    Wednesday: Showers and thunderstorms before 4pm, then showers likely. Areas of fog before 2pm. High near 56. Northeast wind 3 to 5 mph. Chance of precipitation is 90%.

    High: 56 °F

    Chance
    T-storms and
    Areas Fog
    then Showers
    and Patchy
    Fog

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 10pm, then showers likely and possibly a thunderstorm between 10pm and 4am, then a chance of showers and thunderstorms after 4am. Patchy fog after 11pm. Otherwise, cloudy, with a low around 50. Light and variable wind becoming southwest around 5 mph after midnight. Chance of precipitation is 70%.

    Low: 50 °F

    Showers
    Likely and
    Patchy Fog

  • Thursday

    Thursday: A 40 percent chance of showers, mainly before 9am. Mostly cloudy, with a high near 64. West wind 5 to 7 mph becoming light and variable in the afternoon.

    High: 64 °F

    Chance
    Showers then
    Partly Sunny

  • Thursday Night

    Thursday Night: A slight chance of showers before 9pm, then a slight chance of showers and thunderstorms between 9pm and midnight, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 54. Calm wind becoming south 5 to 7 mph after midnight. Chance of precipitation is 60%.

    Low: 54 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: A 50 percent chance of showers. Partly sunny, with a high near 77.

    High: 77 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 51. Chance of precipitation is 100%.

    Low: 51 °F

    Showers
    Likely then
    Showers

  • Saturday

    Saturday: A 30 percent chance of showers before noon. Partly sunny, with a high near 61.

    High: 61 °F

    Chance
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

Detailed Forecast

Overnight
A 50 percent chance of showers and thunderstorms. Patchy fog after 4am. Otherwise, cloudy, with a low around 45. Northeast wind around 5 mph.
Wednesday
Showers and thunderstorms before 4pm, then showers likely. Areas of fog before 2pm. High near 56. Northeast wind 3 to 5 mph. Chance of precipitation is 90%.
Wednesday Night
A chance of showers and thunderstorms before 10pm, then showers likely and possibly a thunderstorm between 10pm and 4am, then a chance of showers and thunderstorms after 4am. Patchy fog after 11pm. Otherwise, cloudy, with a low around 50. Light and variable wind becoming southwest around 5 mph after midnight. Chance of precipitation is 70%.
Thursday
A 40 percent chance of showers, mainly before 9am. Mostly cloudy, with a high near 64. West wind 5 to 7 mph becoming light and variable in the afternoon.
Thursday Night
A slight chance of showers before 9pm, then a slight chance of showers and thunderstorms between 9pm and midnight, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 54. Calm wind becoming south 5 to 7 mph after midnight. Chance of precipitation is 60%.
Friday
A 50 percent chance of showers. Partly sunny, with a high near 77.
Friday Night
Showers and possibly a thunderstorm. Low around 51. Chance of precipitation is 100%.
Saturday
A 30 percent chance of showers before noon. Partly sunny, with a high near 61.
Saturday Night
Mostly clear, with a low around 39.
Sunday
Sunny, with a high near 66.
Sunday Night
Mostly clear, with a low around 47.
Monday
Sunny, with a high near 76.
Monday Night
A 40 percent chance of showers and thunderstorms. Mostly clear, with a low around 59.
Tuesday
Showers and thunderstorms likely. Mostly cloudy, with a high near 75. Chance of precipitation is 70%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Hardin IL
 39.14°N 90.66°W (Elev. 604 ft)
Last Update:
12:51 am CST Mar 4, 2026
Forecast Valid:
3am CST Mar 4, 2026-6pm CDT Mar 10, 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