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

49°F

9°C

Humidity 74%
Wind Speed W 16 mph
Barometer 30.07 in (1018.1 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 4 Apr 1:54 pm CDT
Extended Forecast for

5 Miles WSW Jerseyville IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a steady temperature around 53. West wind around 16 mph, with gusts as high as 26 mph.

    High: 53 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 37. West wind 9 to 14 mph, with gusts as high as 23 mph.

    Low: 37 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 57. Northwest wind 10 to 13 mph, with gusts as high as 20 mph.

    High: 57 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 39. West wind around 6 mph.

    Low: 39 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 59. Northwest wind 7 to 11 mph.

    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 34. Chance of precipitation is 20%.

    Low: 34 °F

    Mostly Cloudy
    then Slight
    Chance
    Rain/Snow

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 51.

    High: 51 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 72.

    High: 72 °F

    Partly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a steady temperature around 53. West wind around 16 mph, with gusts as high as 26 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 37. West wind 9 to 14 mph, with gusts as high as 23 mph.
Sunday
Sunny, with a high near 57. Northwest wind 10 to 13 mph, with gusts as high as 20 mph.
Sunday Night
Clear, with a low around 39. West wind around 6 mph.
Monday
Sunny, with a high near 59. Northwest wind 7 to 11 mph.
Monday Night
A slight chance of rain showers after 1am, mixing with snow after 4am. Mostly cloudy, with a low around 34. Chance of precipitation is 20%.
Tuesday
Mostly cloudy, with a high near 51.
Tuesday Night
Mostly cloudy, with a low around 39.
Wednesday
Partly sunny, with a high near 72.
Wednesday Night
Mostly cloudy, with a low around 53.
Thursday
A 20 percent chance of showers. Mostly sunny, with a high near 73.
Thursday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 53.
Friday
A 30 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:
5 Miles WSW Jerseyville IL
 39.09°N 90.41°W (Elev. 574 ft)
Last Update:
1:26 pm CDT Apr 4, 2026
Forecast Valid:
2pm CDT Apr 4, 2026-6pm CDT Apr 10, 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