National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

76°F

24°C

Humidity 67%
Wind Speed W 3 mph
Barometer 30.16 in (1020.7 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 28 Aug 9:54 am CDT
Extended Forecast for

Jerseyville IL

  • Today

    Today: Sunny, with a high near 85. Light north wind.

    High: 85 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 61. Light southeast wind.

    Low: 61 °F

    Mostly Clear

  • Saturday

    Saturday: Increasing clouds, with a high near 87. South wind 3 to 8 mph.

    High: 87 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 67. South wind around 8 mph.

    Low: 67 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 92. South wind 8 to 11 mph.

    High: 92 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

Detailed Forecast

Today
Sunny, with a high near 85. Light north wind.
Tonight
Mostly clear, with a low around 61. Light southeast wind.
Saturday
Increasing clouds, with a high near 87. South wind 3 to 8 mph.
Saturday Night
Partly cloudy, with a low around 67. South wind around 8 mph.
Sunday
Sunny, with a high near 92. South wind 8 to 11 mph.
Sunday Night
Mostly clear, with a low around 72.
Monday
Sunny, with a high near 96.
Monday Night
Mostly clear, with a low around 73.
Tuesday
Sunny and hot, with a high near 97.
Tuesday Night
Mostly clear, with a low around 75.
Wednesday
Sunny and hot, with a high near 97.
Wednesday Night
Mostly clear, with a low around 75.
Thursday
A 20 percent chance of showers. Sunny and hot, with a high near 97.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Jerseyville IL
 39.11°N 90.32°W (Elev. 630 ft)
Last Update:
9:47 am CDT Aug 28, 2026
Forecast Valid:
10am CDT Aug 28, 2026-6pm CDT Sep 3, 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