Extreme Heat in the Southwest; Severe Weather in the Northern Plains; Heavy Rain in the East

Extreme heat continues across the Southwest as temperatures may top 120 degrees. The heat may expand across the West and south-central U.S. into the middle of the month. Severe thunderstorms capable of severe wind gusts and large hail will be the primary hazards today across the northern Plains into the upper Midwest. Rainfall could be locally heavy across the Eastern U.S. today. Read More >

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 90%
Wind Speed Calm
Barometer 29.97 in (1014.4 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 3 Aug 10:54 pm CDT
Extended Forecast for

3 Miles SW Dow IL

  • Tonight

    Tonight: Clear, with a low around 64. Calm wind becoming southeast around 5 mph.

    Low: 64 °F

    Clear

  • Tuesday

    Tuesday: Patchy fog before 7am.  Otherwise, sunny, with a high near 88. Southeast wind 3 to 6 mph.

    High: 88 °F

    Patchy Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 68. Southeast wind around 6 mph.

    Low: 68 °F

    Mostly Clear

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms between 4pm and 5pm.  Mostly sunny, with a high near 90. South wind 3 to 7 mph.  Chance of precipitation is 20%.

    High: 90 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms between 7pm and 1am, then showers likely and possibly a thunderstorm after 1am.  Mostly cloudy, with a low around 68. Southeast wind 6 to 8 mph.  Chance of precipitation is 70%.

    Low: 68 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before 1pm.  Mostly cloudy, with a high near 84. Chance of precipitation is 70%.

    High: 84 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 67.

    Low: 67 °F

    Slight Chance
    T-storms

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms.  Partly cloudy, with a low around 67. Chance of precipitation is 20%.

    Low: 67 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Clear, with a low around 64. Calm wind becoming southeast around 5 mph.
Tuesday
Patchy fog before 7am. Otherwise, sunny, with a high near 88. Southeast wind 3 to 6 mph.
Tuesday Night
Mostly clear, with a low around 68. Southeast wind around 6 mph.
Wednesday
A slight chance of showers and thunderstorms between 4pm and 5pm. Mostly sunny, with a high near 90. South wind 3 to 7 mph. Chance of precipitation is 20%.
Wednesday Night
A chance of showers and thunderstorms between 7pm and 1am, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 68. Southeast wind 6 to 8 mph. Chance of precipitation is 70%.
Thursday
Showers likely and possibly a thunderstorm before 1pm. Mostly cloudy, with a high near 84. Chance of precipitation is 70%.
Thursday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84.
Friday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 67. Chance of precipitation is 20%.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Saturday Night
Mostly clear, with a low around 70.
Sunday
Sunny, with a high near 91.
Sunday Night
Partly cloudy, with a low around 72.
Monday
Mostly sunny, with a high near 91.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SW Dow IL
 39.02°N 90.33°W (Elev. 650 ft)
10:21 pm CDT Aug 3, 2026
10pm CDT Aug 3, 2026-6pm CDT Aug 10, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database