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

52°F

11°C

Humidity 77%
Wind Speed NW 17 G 24 mph
Barometer 30.40 in (1029.5 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Wind Chill47°F (8°C)
Last update 16 Oct 8:54 pm CDT
Extended Forecast for

4 Miles WSW Hardin IL

Frost Advisory October 17, 01:00am until October 17, 09:00am
Click here for hazard details and duration
Frost Advisory

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 37. North wind 5 to 14 mph, with gusts as high as 23 mph.

    Low: 37 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Patchy frost before 8am. Otherwise, sunny, with a high near 61. Light and variable wind.

    High: 61 °F

    Patchy Frost
    then Sunny

  • Saturday Night

    Saturday Night: Patchy frost after 4am. Otherwise, clear, with a low around 37. Calm wind.

    Low: 37 °F

    Clear then
    Patchy Frost

  • Sunday

    Sunday: Patchy frost before 8am. Otherwise, sunny, with a high near 67. Calm wind becoming south around 6 mph in the morning.

    High: 67 °F

    Patchy Frost
    then Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 39. Light south wind.

    Low: 39 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 72.

    High: 72 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 41.

    Low: 41 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 75.

    High: 75 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 43.

    Low: 43 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming clear, with a low around 37. North wind 5 to 14 mph, with gusts as high as 23 mph.
Saturday
Patchy frost before 8am. Otherwise, sunny, with a high near 61. Light and variable wind.
Saturday Night
Patchy frost after 4am. Otherwise, clear, with a low around 37. Calm wind.
Sunday
Patchy frost before 8am. Otherwise, sunny, with a high near 67. Calm wind becoming south around 6 mph in the morning.
Sunday Night
Clear, with a low around 39. Light south wind.
Monday
Sunny, with a high near 72.
Monday Night
Partly cloudy, with a low around 41.
Tuesday
Sunny, with a high near 75.
Tuesday Night
Mostly clear, with a low around 43.
Wednesday
Sunny, with a high near 78.
Wednesday Night
Mostly clear, with a low around 46.
Thursday
Sunny, with a high near 81.
Thursday Night
Mostly clear, with a low around 49.
Friday
Mostly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WSW Hardin IL
 39.14°N 90.69°W (Elev. 430 ft)
Last Update:
9:26 pm CDT Oct 16, 2026
Forecast Valid:
9pm CDT Oct 16, 2026-6pm CDT Oct 23, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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