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

79°F

26°C

Humidity 58%
Wind Speed SW 9 mph
Barometer 30.06 in (1017.6 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 24 Jun 10:54 am CDT
Extended Forecast for

5 Miles WSW Jerseyville IL

  • Today

    Today: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Mostly cloudy, with a high near 81. Southwest wind around 8 mph.

    High: 81 °F

    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 4am, then a slight chance of showers and thunderstorms after 5am. Mostly cloudy, with a low around 64. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 64 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 85. Calm wind becoming southeast around 5 mph in the afternoon.

    High: 85 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 65. East wind around 5 mph becoming light and variable. Chance of precipitation is 90%.

    Low: 65 °F

    T-storms

  • Friday

    Friday: Showers and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. High near 81. South wind 6 to 8 mph. Chance of precipitation is 80%.

    High: 81 °F

    T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms likely. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.

    Low: 66 °F

    T-storms
    Likely

  • Saturday

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

    High: 86 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.

    Low: 70 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny, with a high near 94.

    High: 94 °F

    Mostly Sunny

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Mostly cloudy, with a high near 81. Southwest wind around 8 mph.
Tonight
A chance of showers and thunderstorms before 4am, then a slight chance of showers and thunderstorms after 5am. Mostly cloudy, with a low around 64. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Thursday
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 85. Calm wind becoming southeast around 5 mph in the afternoon.
Thursday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 65. East wind around 5 mph becoming light and variable. Chance of precipitation is 90%.
Friday
Showers and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. High near 81. South wind 6 to 8 mph. Chance of precipitation is 80%.
Friday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
Saturday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.
Sunday
Mostly sunny, with a high near 94.
Sunday Night
Mostly clear, with a low around 73.
Monday
Sunny, with a high near 96.
Monday Night
Mostly clear, with a low around 75.
Tuesday
Sunny, with a high near 96.
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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:
8:31 am CDT Jun 24, 2026
Forecast Valid:
11am CDT Jun 24, 2026-6pm CDT Jun 30, 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