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

11°F

-12°C

Humidity 81%
Wind Speed Calm
Barometer 30.17 in (1022.4 mb)
Dewpoint 6°F (-14°C)
Visibility 10.00 mi
Last update 5 Dec 1:54 am CST
Extended Forecast for

Jerseyville IL

  • Overnight

    Overnight: Mostly clear, with a low around 3. Calm wind becoming south around 5 mph.

    Low: 3 °F

    Mostly Clear

  • Friday

    Friday: Partly sunny, then gradually becoming sunny, with a high near 39. South wind 5 to 9 mph.

    High: 39 °F

    Becoming
    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 27. South wind around 7 mph becoming west after midnight.

    Low: 27 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 35. Northwest wind around 6 mph becoming light and variable.

    High: 35 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 50 percent chance of snow after midnight. Mostly cloudy, with a low around 27. Southeast wind 6 to 8 mph.

    Low: 27 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: A chance of rain and snow before 9am, then a chance of snow between 9am and noon. Mostly cloudy, with a high near 35. Chance of precipitation is 30%.

    High: 35 °F

    Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 10.

    Low: 10 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 28.

    High: 28 °F

    Mostly Sunny

  • Monday Night

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

    Low: 20 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 3. Calm wind becoming south around 5 mph.
Friday
Partly sunny, then gradually becoming sunny, with a high near 39. South wind 5 to 9 mph.
Friday Night
Mostly cloudy, with a low around 27. South wind around 7 mph becoming west after midnight.
Saturday
Mostly cloudy, with a high near 35. Northwest wind around 6 mph becoming light and variable.
Saturday Night
A 50 percent chance of snow after midnight. Mostly cloudy, with a low around 27. Southeast wind 6 to 8 mph.
Sunday
A chance of rain and snow before 9am, then a chance of snow between 9am and noon. Mostly cloudy, with a high near 35. Chance of precipitation is 30%.
Sunday Night
Mostly cloudy, with a low around 10.
Monday
Mostly sunny, with a high near 28.
Monday Night
Partly cloudy, with a low around 20.
Tuesday
Mostly sunny, with a high near 42.
Tuesday Night
Mostly cloudy, with a low around 33.
Wednesday
A 30 percent chance of rain. Mostly cloudy, with a high near 42.
Wednesday Night
Mostly cloudy, with a low around 19.
Thursday
Mostly cloudy, with a high near 29.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Jerseyville IL
 39.11°N 90.32°W (Elev. 630 ft)
Last Update:
12:26 am CST Dec 5, 2025
Forecast Valid:
2am CST Dec 5, 2025-6pm CST Dec 11, 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