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.

Fair

67°F

19°C

Humidity 47%
Wind Speed NW 9 mph
Barometer 29.97 in (1014.4 mb)
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 13 May 2:54 am CDT
Extended Forecast for

Jerseyville IL

  • Overnight

    Overnight: Clear, with a low around 55. Northwest wind around 8 mph.

    Low: 55 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 72. Northwest wind 9 to 16 mph, with gusts as high as 24 mph.

    High: 72 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 46. North wind 5 to 9 mph becoming calm in the evening.

    Low: 46 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 73. Calm wind becoming south 5 to 8 mph in the afternoon.

    High: 73 °F

    Sunny

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 55. Southeast wind 10 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.

    Low: 55 °F

    Mostly Cloudy
    then Showers
    Likely

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 1pm. Partly sunny, with a high near 82. Chance of precipitation is 60%.

    High: 82 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 63.

    Low: 63 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.

    High: 86 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.

    Low: 64 °F

    Chance
    T-storms

Detailed Forecast

Overnight
Clear, with a low around 55. Northwest wind around 8 mph.
Wednesday
Sunny, with a high near 72. Northwest wind 9 to 16 mph, with gusts as high as 24 mph.
Wednesday Night
Clear, with a low around 46. North wind 5 to 9 mph becoming calm in the evening.
Thursday
Sunny, with a high near 73. Calm wind becoming south 5 to 8 mph in the afternoon.
Thursday Night
Showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 55. Southeast wind 10 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.
Friday
Showers likely and possibly a thunderstorm before 1pm. Partly sunny, with a high near 82. Chance of precipitation is 60%.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 63.
Saturday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
Saturday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Sunday
Mostly sunny, with a high near 88.
Sunday Night
Partly cloudy, with a low around 68.
Monday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Monday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Tuesday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 78. Chance of precipitation is 70%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Jerseyville IL
 39.13°N 90.32°W (Elev. 614 ft)
Last Update:
2:01 am CDT May 13, 2026
Forecast Valid:
3am CDT May 13, 2026-6pm CDT May 19, 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