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

46°F

8°C

Humidity 71%
Wind Speed Calm
Barometer 29.88 in (1011.9 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 8 Mar 9:54 pm CDT
Extended Forecast for

4 Miles ENE Jerseyville IL

  • Tonight

    Tonight: Clear, with a low around 43. South wind around 10 mph.

    Low: 43 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 75. South wind 10 to 18 mph, with gusts as high as 30 mph.

    High: 75 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 58. South wind around 10 mph.

    Low: 58 °F

    Mostly Clear

  • Tuesday

    Tuesday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 81. South wind 9 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 50%.

    High: 81 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 49. South wind 14 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 100%.

    Low: 49 °F

    T-storms then
    Showers

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. Temperature rising to near 63 by 8am, then falling to around 49 during the remainder of the day. Breezy. Chance of precipitation is 100%.

    High: 63 °F⇓

    Showers and
    Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 35. Breezy.

    Low: 35 °F

    Mostly Cloudy
    and Breezy
    then Mostly
    Clear

  • Thursday

    Thursday: Sunny, with a high near 53.

    High: 53 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 43. South wind around 10 mph.
Monday
Sunny, with a high near 75. South wind 10 to 18 mph, with gusts as high as 30 mph.
Monday Night
Mostly clear, with a low around 58. South wind around 10 mph.
Tuesday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 81. South wind 9 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 50%.
Tuesday Night
Showers and possibly a thunderstorm. Low around 49. South wind 14 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 100%.
Wednesday
Showers and possibly a thunderstorm. Temperature rising to near 63 by 8am, then falling to around 49 during the remainder of the day. Breezy. Chance of precipitation is 100%.
Wednesday Night
Partly cloudy, with a low around 35. Breezy.
Thursday
Sunny, with a high near 53.
Thursday Night
Mostly cloudy, with a low around 42.
Friday
Mostly sunny, with a high near 61.
Friday Night
Mostly cloudy, with a low around 36.
Saturday
Partly sunny, with a high near 56.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 40.
Sunday
A 50 percent chance of showers. Mostly cloudy, with a high near 62.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles ENE Jerseyville IL
 39.13°N 90.27°W (Elev. 558 ft)
Last Update:
6:16 pm CDT Mar 8, 2026
Forecast Valid:
10pm CDT Mar 8, 2026-6pm CDT Mar 15, 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