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.

Mostly Cloudy

80°F

27°C

Humidity 58%
Wind Speed S 13 mph
Barometer 29.89 in (1011.7 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 3 Apr 5:54 pm CDT
Extended Forecast for

4 Miles W Jerseyville IL

  • Tonight

    Tonight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 55. South wind 11 to 14 mph, with gusts as high as 28 mph. Chance of precipitation is 90%.

    Low: 55 °F

    Chance
    T-storms then
    T-storms

  • Saturday

    Saturday: Showers likely, mainly before 10am. Mostly cloudy, with a temperature falling to around 52 by noon. West wind 13 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.

    High: 56 °F⇓

    Showers
    Likely then
    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 37. West wind 10 to 15 mph, with gusts as high as 24 mph.

    Low: 37 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 57. Northwest wind 10 to 13 mph, with gusts as high as 21 mph.

    High: 57 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 39. West wind around 7 mph.

    Low: 39 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 59.

    High: 59 °F

    Sunny

  • Monday Night

    Monday Night: A slight chance of rain showers after 1am, mixing with snow after 4am. Mostly cloudy, with a low around 35. Chance of precipitation is 20%.

    Low: 35 °F

    Mostly Cloudy
    then Slight
    Chance
    Rain/Snow

  • Tuesday

    Tuesday: Partly sunny, with a high near 53.

    High: 53 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40.

    Low: 40 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 55. South wind 11 to 14 mph, with gusts as high as 28 mph. Chance of precipitation is 90%.
Saturday
Showers likely, mainly before 10am. Mostly cloudy, with a temperature falling to around 52 by noon. West wind 13 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.
Saturday Night
Mostly clear, with a low around 37. West wind 10 to 15 mph, with gusts as high as 24 mph.
Sunday
Sunny, with a high near 57. Northwest wind 10 to 13 mph, with gusts as high as 21 mph.
Sunday Night
Clear, with a low around 39. West wind around 7 mph.
Monday
Sunny, with a high near 59.
Monday Night
A slight chance of rain showers after 1am, mixing with snow after 4am. Mostly cloudy, with a low around 35. Chance of precipitation is 20%.
Tuesday
Partly sunny, with a high near 53.
Tuesday Night
Mostly cloudy, with a low around 40.
Wednesday
Mostly sunny, with a high near 71.
Wednesday Night
Mostly clear, with a low around 53.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 74.
Thursday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 54.
Friday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 75.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles W Jerseyville IL
 39.11°N 90.41°W (Elev. 617 ft)
Last Update:
5:36 pm CDT Apr 3, 2026
Forecast Valid:
6pm CDT Apr 3, 2026-6pm CDT Apr 10, 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