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

17°F

-8°C

Humidity 88%
Wind Speed E 3 mph
Barometer 30.07 in (1018.9 mb)
Dewpoint 14°F (-10°C)
Visibility 8.00 mi
Last update 2 Dec 11:54 pm CST
Extended Forecast for

4 Miles W Jerseyville IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 18. South wind around 6 mph.

    Low: 18 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 50 percent chance of snow, mainly after 4pm. Mostly cloudy, with a high near 37. South wind 6 to 8 mph becoming northwest in the afternoon.

    High: 37 °F

    Mostly Cloudy
    then Chance
    Snow

  • Wednesday Night

    Wednesday Night: A 40 percent chance of snow, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 10. North wind 8 to 11 mph, with gusts as high as 21 mph.

    Low: 10 °F

    Chance Snow
    then Mostly
    Cloudy

  • Thursday

    Thursday: Sunny and cold, with a high near 20. North wind 5 to 8 mph becoming calm in the afternoon.

    High: 20 °F

    Cold

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 8. Calm wind becoming south around 5 mph after midnight.

    Low: 8 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 20.

    Low: 20 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 34.

    High: 34 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 22.

    Low: 22 °F

    Mostly Cloudy
    then Slight
    Chance Snow

Detailed Forecast

Overnight
Mostly cloudy, with a low around 18. South wind around 6 mph.
Wednesday
A 50 percent chance of snow, mainly after 4pm. Mostly cloudy, with a high near 37. South wind 6 to 8 mph becoming northwest in the afternoon.
Wednesday Night
A 40 percent chance of snow, mainly before 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 10. North wind 8 to 11 mph, with gusts as high as 21 mph.
Thursday
Sunny and cold, with a high near 20. North wind 5 to 8 mph becoming calm in the afternoon.
Thursday Night
Partly cloudy, with a low around 8. Calm wind becoming south around 5 mph after midnight.
Friday
Mostly sunny, with a high near 33.
Friday Night
Partly cloudy, with a low around 20.
Saturday
Partly sunny, with a high near 34.
Saturday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 22.
Sunday
A 20 percent chance of snow. Mostly cloudy, with a high near 31.
Sunday Night
Mostly cloudy, with a low around 17.
Monday
Partly sunny, with a high near 32.
Monday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 24.
Tuesday
Partly sunny, with a high near 38.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles W Jerseyville IL
 39.11°N 90.41°W (Elev. 617 ft)
Last Update:
9:56 pm CST Dec 2, 2025
Forecast Valid:
12am CST Dec 3, 2025-6pm CST Dec 9, 2025
 
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