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.

Overcast

75°F

24°C

Humidity 82%
Wind Speed W 9 mph
Barometer 30.02 in (1016.1 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 14 Oct 2:54 pm CDT
Extended Forecast for

Jerseyville IL

  • This Afternoon

    This Afternoon: A 20 percent chance of showers before 4pm. Cloudy, with a high near 75. North wind 3 to 5 mph.

    High: 75 °F

    Slight Chance
    Showers

  • 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

    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.

    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

Detailed Forecast

This Afternoon
A 20 percent chance of showers before 4pm. Cloudy, with a high near 75. North wind 3 to 5 mph.
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.
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:
2:06 pm CDT Oct 14, 2026
Forecast Valid:
3pm CDT Oct 14, 2026-6pm CDT Oct 21, 2026
 
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