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

68°F

20°C

Humidity 93%
Wind Speed Calm
Barometer 30.01 in (1015.6 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 20 Jun 12:54 am CDT
Extended Forecast for

4 Miles W Jerseyville IL

Extreme Heat Watch June 21, 12:00pm until June 24, 09:00pm
Click here for hazard details and duration
Extreme Heat Watch

  • Overnight

    Overnight: Mostly clear, with a low around 66. South wind 3 to 5 mph.

    Low: 66 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 90. South wind 5 to 11 mph.

    High: 90 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 75. South wind 9 to 11 mph, with gusts as high as 21 mph.

    Low: 75 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 94. Heat index values as high as 100. Southwest wind 11 to 16 mph, with gusts as high as 25 mph.

    High: 94 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 75. South wind 9 to 11 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Sunday Night

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

    Low: 75 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Monday Night

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

    Low: 75 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 66. South wind 3 to 5 mph.
Friday
Sunny, with a high near 90. South wind 5 to 11 mph.
Friday Night
Mostly clear, with a low around 75. South wind 9 to 11 mph, with gusts as high as 21 mph.
Saturday
Sunny, with a high near 94. Heat index values as high as 100. Southwest wind 11 to 16 mph, with gusts as high as 25 mph.
Saturday Night
Mostly clear, with a low around 75. South wind 9 to 11 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 94.
Sunday Night
Mostly clear, with a low around 75.
Monday
Sunny, with a high near 94.
Monday Night
Mostly clear, with a low around 75.
Tuesday
A 20 percent chance of showers and thunderstorms before 1pm. Sunny, with a high near 93.
Tuesday Night
Partly cloudy, with a low around 74.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Wednesday Night
Partly cloudy, with a low around 74.
Thursday
A 30 percent chance of showers and thunderstorms. Sunny, with a high near 90.
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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:
10:36 pm CDT Jun 19, 2025
Forecast Valid:
1am CDT Jun 20, 2025-6pm CDT Jun 26, 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