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.

Fair

70°F

21°C

Humidity 97%
Wind Speed Calm
Barometer 29.80 in (1008.7 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 18 Jun 2:54 am CDT
Extended Forecast for

Jerseyville IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 71. Light south wind.

    Low: 71 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83. Southwest wind 8 to 17 mph, with gusts as high as 25 mph.

    High: 83 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms, mainly before 11pm. Mostly cloudy, with a low around 65. Southwest wind 6 to 10 mph.

    Low: 65 °F

    Chance
    T-storms then
    Partly Cloudy

  • Juneteenth

    Juneteenth: Sunny, with a high near 83. Northwest wind 7 to 9 mph.

    High: 83 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 66. Calm wind becoming south around 5 mph after midnight.

    Low: 66 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 89.

    High: 89 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 93.

    High: 93 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 75.

    Low: 75 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 71. Light south wind.
Wednesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83. Southwest wind 8 to 17 mph, with gusts as high as 25 mph.
Wednesday Night
A 40 percent chance of showers and thunderstorms, mainly before 11pm. Mostly cloudy, with a low around 65. Southwest wind 6 to 10 mph.
Juneteenth
Sunny, with a high near 83. Northwest wind 7 to 9 mph.
Thursday Night
Mostly clear, with a low around 66. Calm wind becoming south around 5 mph after midnight.
Friday
Sunny, with a high near 89.
Friday Night
Mostly clear, with a low around 74.
Saturday
Sunny, with a high near 93.
Saturday Night
Mostly clear, with a low around 75.
Sunday
Sunny, with a high near 94.
Sunday Night
Mostly clear, with a low around 75.
Monday
Sunny, with a high near 93.
Monday Night
Partly cloudy, with a low around 74.
Tuesday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 92.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Jerseyville IL
 39.11°N 90.32°W (Elev. 630 ft)
Last Update:
2:52 am CDT Jun 18, 2025
Forecast Valid:
3am CDT Jun 18, 2025-6pm CDT Jun 24, 2025
 
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