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

54°F

12°C

Humidity 80%
Wind Speed E 6 mph
Barometer 30.05 in (1017.3 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Wind Chill52°F (11°C)
Last update 10 Oct 6:54 am CDT
Extended Forecast for

Jerseyville IL

  • Today

    Today: Mostly cloudy, with a high near 83. Southeast wind around 7 mph.

    High: 83 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 53. Southeast wind 5 to 7 mph becoming calm after midnight.

    Low: 53 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 87. Light and variable wind.

    High: 87 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 63. South wind 3 to 6 mph.

    Low: 63 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 93. Southwest wind 7 to 14 mph, with gusts as high as 21 mph.

    High: 93 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly clear, with a low around 61.

    Low: 61 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm. Mostly sunny, with a high near 79. Chance of precipitation is 70%.

    High: 79 °F

    Showers
    Likely

Detailed Forecast

Today
Mostly cloudy, with a high near 83. Southeast wind around 7 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 53. Southeast wind 5 to 7 mph becoming calm after midnight.
Sunday
Sunny, with a high near 87. Light and variable wind.
Sunday Night
Mostly clear, with a low around 63. South wind 3 to 6 mph.
Columbus Day
Sunny, with a high near 93. Southwest wind 7 to 14 mph, with gusts as high as 21 mph.
Monday Night
Mostly clear, with a low around 69.
Tuesday
Sunny, with a high near 89.
Tuesday Night
A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly clear, with a low around 61.
Wednesday
Showers likely and possibly a thunderstorm. Mostly sunny, with a high near 79. Chance of precipitation is 70%.
Wednesday Night
A chance of showers, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 57. Chance of precipitation is 50%.
Thursday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 77.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 51.
Friday
A 20 percent chance of showers. Mostly sunny, with a high near 69.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Jerseyville IL
 39.11°N 90.35°W (Elev. 620 ft)
Last Update:
5:16 am CDT Oct 10, 2026
Forecast Valid:
7am CDT Oct 10, 2026-6pm CDT Oct 16, 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