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.

A Few Clouds

68°F

20°C

Humidity 76%
Wind Speed NE 8 mph
Barometer 30.06 in (1017.6 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 3 Aug 10:54 pm CDT
Extended Forecast for

Jerseyville IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 60. Northeast wind 3 to 5 mph.

    Low: 60 °F

    Mostly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 81. Northeast wind 3 to 6 mph.

    High: 81 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Increasing clouds, with a low around 65. Northeast wind around 5 mph becoming light and variable after midnight.

    Low: 65 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 82. Calm wind becoming east around 5 mph in the afternoon.

    High: 82 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 66. East wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, with a low around 60. Northeast wind 3 to 5 mph.
Monday
A 20 percent chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 81. Northeast wind 3 to 6 mph.
Monday Night
Increasing clouds, with a low around 65. Northeast wind around 5 mph becoming light and variable after midnight.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 82. Calm wind becoming east around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 66. East wind around 5 mph becoming calm in the evening.
Wednesday
Sunny, with a high near 85.
Wednesday Night
Mostly clear, with a low around 67.
Thursday
Sunny, with a high near 87.
Thursday Night
Mostly clear, with a low around 70.
Friday
Sunny, with a high near 89.
Friday Night
Mostly clear, with a low around 72.
Saturday
Sunny, with a high near 90.
Saturday Night
Mostly clear, with a low around 72.
Sunday
Sunny, with a high near 89.
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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:
10:21 pm CDT Aug 3, 2025
Forecast Valid:
11pm CDT Aug 3, 2025-6pm CDT Aug 10, 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