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

20°F

-7°C

Humidity 52%
Wind Speed NW 16 G 28 mph
Barometer 30.17 in (1022.2 mb)
Dewpoint 5°F (-15°C)
Visibility 10.00 mi
Wind Chill6°F (-14°C)
Last update 17 Mar 2:54 am CDT
Extended Forecast for

Hardin IL

  • Overnight

    Overnight: Mostly clear, with a low around 12. Northwest wind around 11 mph, with gusts as high as 23 mph.

    Low: 12 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 32. Northwest wind 5 to 9 mph becoming south in the afternoon.

    High: 32 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A chance of snow before 3am, then a chance of rain. Cloudy, with a low around 29. Southeast wind 6 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.

    Low: 29 °F

    Chance Snow
    then Chance
    Rain/Snow

  • Wednesday

    Wednesday: Sunny, with a high near 62. South wind 6 to 10 mph becoming west in the afternoon.

    High: 62 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 41. Calm wind becoming south around 5 mph after midnight.

    Low: 41 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 71.

    High: 71 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 48.

    Low: 48 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 12. Northwest wind around 11 mph, with gusts as high as 23 mph.
Tuesday
Increasing clouds, with a high near 32. Northwest wind 5 to 9 mph becoming south in the afternoon.
Tuesday Night
A chance of snow before 3am, then a chance of rain. Cloudy, with a low around 29. Southeast wind 6 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 50%.
Wednesday
Sunny, with a high near 62. South wind 6 to 10 mph becoming west in the afternoon.
Wednesday Night
Mostly cloudy, with a low around 41. Calm wind becoming south around 5 mph after midnight.
Thursday
Mostly sunny, with a high near 71.
Thursday Night
Partly cloudy, with a low around 45.
Friday
Mostly sunny, with a high near 74.
Friday Night
Mostly clear, with a low around 48.
Saturday
Sunny, with a high near 77.
Saturday Night
Mostly clear, with a low around 51.
Sunday
Mostly sunny, with a high near 72.
Sunday Night
Partly cloudy, with a low around 40.
Monday
Partly sunny, with a high near 54.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Hardin IL
 39.16°N 90.64°W (Elev. 692 ft)
Last Update:
1:41 am CDT Mar 17, 2026
Forecast Valid:
3am CDT Mar 17, 2026-6pm CDT Mar 23, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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