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

67°F

19°C

Humidity 91%
Wind Speed NW 6 mph
Barometer 29.93 in (1013.0 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 19 Jun 5:54 am CDT
Extended Forecast for

3 Miles SW Jerseyville IL

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

  • Juneteenth

    Juneteenth: Partly sunny, then gradually becoming sunny, with a high near 84. Northwest wind 5 to 8 mph.

    High: 84 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 66. West wind around 6 mph becoming light and variable.

    Low: 66 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 89. South wind 6 to 11 mph, with gusts as high as 20 mph.

    High: 89 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 75. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 94. Southwest wind 10 to 14 mph, with gusts as high as 23 mph.

    High: 94 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 76.

    Low: 76 °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 76.

    Low: 76 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

Detailed Forecast

Juneteenth
Partly sunny, then gradually becoming sunny, with a high near 84. Northwest wind 5 to 8 mph.
Tonight
Mostly clear, with a low around 66. West wind around 6 mph becoming light and variable.
Friday
Mostly sunny, with a high near 89. South wind 6 to 11 mph, with gusts as high as 20 mph.
Friday Night
Mostly clear, with a low around 75. South wind around 10 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 94. Southwest wind 10 to 14 mph, with gusts as high as 23 mph.
Saturday Night
Mostly clear, with a low around 76.
Sunday
Sunny, with a high near 94.
Sunday Night
Mostly clear, with a low around 76.
Monday
Sunny, with a high near 95.
Monday Night
Partly cloudy, with a low around 75.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Tuesday Night
Partly cloudy, with a low around 74.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SW Jerseyville IL
 39.09°N 90.38°W (Elev. 607 ft)
Last Update:
2:51 am CDT Jun 19, 2025
Forecast Valid:
6am CDT Jun 19, 2025-6pm CDT Jun 25, 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