Showers and Storms continue across the East; Heat, Critical Fire Weather, Drought, and Poor Air Quality continues in the West

A series of fronts will focus locally heavy showers and storms across portions of the central and eastern U.S. through the end of the workweek. Dangerous to extreme heat continues across the Southwest U.S., eventually spreading eastward over the weekend into early next week. Elevated fire weather conditions continue across the Great Basin, with degraded air quality lingering across the Northwest. Read More >

Current conditions at

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

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

87°F

31°C

Humidity 51%
Wind Speed E 6 mph
Barometer 29.99 in (1014.9 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 4 Aug 4:54 pm CDT
Extended Forecast for

3 Miles WSW Jerseyville IL

  • Tonight

    Tonight: Mostly clear, with a low around 68. Southeast wind 3 to 6 mph.

    Low: 68 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly after 5pm.  Sunny, then becoming partly sunny during the afternoon, with a high near 88. Light south wind increasing to 5 to 9 mph in the morning.

    High: 88 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms.  Low around 68. North wind 5 to 8 mph becoming light and variable  after midnight.  Chance of precipitation is 80%.

    Low: 68 °F

    T-storms

  • Thursday

    Thursday: Showers and thunderstorms, mainly before 10am.  High near 82. South wind around 6 mph.  Chance of precipitation is 80%.

    High: 82 °F

    T-storms then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am.  Partly cloudy, with a low around 68. Light and variable wind.

    Low: 68 °F

    Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms, mainly after 1pm.  Partly sunny, with a high near 85.

    High: 85 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms, mainly before 1am.  Partly cloudy, with a low around 68.

    Low: 68 °F

    Chance
    T-storms

  • Saturday

    Saturday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms after 1am.  Mostly clear, with a low around 71.

    Low: 71 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 68. Southeast wind 3 to 6 mph.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly after 5pm. Sunny, then becoming partly sunny during the afternoon, with a high near 88. Light south wind increasing to 5 to 9 mph in the morning.
Wednesday Night
Showers and thunderstorms. Low around 68. North wind 5 to 8 mph becoming light and variable after midnight. Chance of precipitation is 80%.
Thursday
Showers and thunderstorms, mainly before 10am. High near 82. South wind around 6 mph. Chance of precipitation is 80%.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 68. Light and variable wind.
Friday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 85.
Friday Night
A 40 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 68.
Saturday
Sunny, with a high near 88.
Saturday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 71.
Sunday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 90.
Sunday Night
Mostly clear, with a low around 74.
Monday
Sunny, with a high near 93.
Monday Night
Partly cloudy, with a low around 75.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Jerseyville IL
 39.11°N 90.38°W (Elev. 600 ft)
1:26 pm CDT Aug 4, 2026
5pm CDT Aug 4, 2026-6pm CDT Aug 11, 2026
 
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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