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

72°F

22°C

Humidity 91%
Wind Speed Calm
Barometer 30.00 in (1015.6 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 14 Oct 6:54 pm CDT
Extended Forecast for

Jerseyville IL

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 4am. Cloudy, with a low around 65. Light and variable wind becoming east around 6 mph after midnight.

    Low: 65 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Thursday

    Thursday: Showers and possibly a thunderstorm, mainly before noon, then a chance of showers and thunderstorms after noon. High near 80. East wind 6 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 90%.

    High: 80 °F

    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Mostly cloudy, with a low around 47. Breezy, with a northwest wind 9 to 14 mph increasing to 15 to 20 mph after midnight. Chance of precipitation is 50%.

    Low: 47 °F

    Chance
    T-storms then
    Chance
    Showers and
    Breezy

  • Friday

    Friday: A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 55. Breezy, with a northwest wind around 22 mph, with gusts as high as 33 mph.

    High: 55 °F

    Breezy.
    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 38. North wind 8 to 17 mph, with gusts as high as 25 mph.

    Low: 38 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 61.

    High: 61 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 37.

    Low: 37 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 67.

    High: 67 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms, mainly after 4am. Cloudy, with a low around 65. Light and variable wind becoming east around 6 mph after midnight.
Thursday
Showers and possibly a thunderstorm, mainly before noon, then a chance of showers and thunderstorms after noon. High near 80. East wind 6 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 90%.
Thursday Night
A chance of showers and thunderstorms before 2am, then a slight chance of showers between 2am and 3am. Mostly cloudy, with a low around 47. Breezy, with a northwest wind 9 to 14 mph increasing to 15 to 20 mph after midnight. Chance of precipitation is 50%.
Friday
A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 55. Breezy, with a northwest wind around 22 mph, with gusts as high as 33 mph.
Friday Night
Partly cloudy, with a low around 38. North wind 8 to 17 mph, with gusts as high as 25 mph.
Saturday
Sunny, with a high near 61.
Saturday Night
Clear, with a low around 37.
Sunday
Sunny, with a high near 67.
Sunday Night
Mostly clear, with a low around 40.
Monday
Mostly sunny, with a high near 73.
Monday Night
Partly cloudy, with a low around 45.
Tuesday
Mostly sunny, with a high near 76.
Tuesday Night
Mostly clear, with a low around 49.
Wednesday
Sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Jerseyville IL
 39.11°N 90.32°W (Elev. 630 ft)
Last Update:
5:36 pm CDT Oct 14, 2026
Forecast Valid:
7pm CDT Oct 14, 2026-6pm CDT Oct 21, 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