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 39%
Wind Speed W 8 mph
Barometer 29.74 in
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 6 Jan 4:54 pm CST
Extended Forecast for

3 Miles SW Hardin IL

  • Tonight

    Tonight: Mostly clear, with a low around 31. West wind 5 to 7 mph becoming calm after midnight.

    Low: 31 °F

    Mostly Clear

  • Wednesday

    Wednesday: Patchy fog before 9am. Otherwise, sunny, with a high near 60. Calm wind becoming south 5 to 8 mph in the morning.

    High: 60 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 45. South wind around 7 mph.

    Low: 45 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Rain. High near 61. Southeast wind 7 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.

    High: 61 °F

    Rain

  • Thursday Night

    Thursday Night: A 50 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 47. South wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 21 mph.

    Low: 47 °F

    Chance Rain
    then Slight
    Chance Rain

  • Friday

    Friday: Mostly cloudy, with a high near 52.

    High: 52 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 30 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 37.

    Low: 37 °F

    Chance Rain

  • Saturday

    Saturday: A slight chance of rain before noon, then a slight chance of rain and snow. Partly sunny, with a high near 44. Chance of precipitation is 20%.

    High: 44 °F

    Slight Chance
    Rain then
    Slight Chance
    Rain/Snow

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 31. West wind 5 to 7 mph becoming calm after midnight.
Wednesday
Patchy fog before 9am. Otherwise, sunny, with a high near 60. Calm wind becoming south 5 to 8 mph in the morning.
Wednesday Night
Increasing clouds, with a low around 45. South wind around 7 mph.
Thursday
Rain. High near 61. Southeast wind 7 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.
Thursday Night
A 50 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 47. South wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 21 mph.
Friday
Mostly cloudy, with a high near 52.
Friday Night
A 30 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 37.
Saturday
A slight chance of rain before noon, then a slight chance of rain and snow. Partly sunny, with a high near 44. Chance of precipitation is 20%.
Saturday Night
Partly cloudy, with a low around 25.
Sunday
Mostly sunny, with a high near 36.
Sunday Night
Mostly clear, with a low around 26.
Monday
Sunny, with a high near 48.
Monday Night
Mostly clear, with a low around 31.
Tuesday
Mostly sunny, with a high near 48.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SW Hardin IL
 39.12°N 90.67°W (Elev. 525 ft)
Last Update:
3:16 pm CST Jan 6, 2026
Forecast Valid:
5pm CST Jan 6, 2026-6pm CST Jan 13, 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