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.

Light Rain

81°F

27°C

Humidity 82%
Wind Speed Calm
Barometer 29.87 in (1011.0 mb)
Dewpoint 75°F (24°C)
Visibility 2.50 mi
Heat Index87°F (31°C)
Last update 27 Jun 2:54 pm CDT
Extended Forecast for

3 Miles E Dow IL

Heat Advisory June 28, 12:00pm until July 3, 12:00am
Click here for hazard details and duration
Heat Advisory

  • This Afternoon

    This Afternoon: Showers and thunderstorms likely, mainly before 4pm. Partly sunny, with a high near 84. West wind around 5 mph. Chance of precipitation is 70%.

    High: 84 °F

    T-storms
    Likely

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms, mainly after midnight. Mostly cloudy, with a low around 71. Southeast wind around 5 mph becoming calm.

    Low: 71 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 93. Heat index values as high as 105. South wind 6 to 11 mph.

    High: 93 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 74. South wind 6 to 10 mph.

    Low: 74 °F

    Increasing
    Clouds

  • Monday

    Monday: Mostly sunny, with a high near 95. South wind 7 to 11 mph.

    High: 95 °F

    Mostly Sunny

  • Monday Night

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

    Low: 75 °F

    Mostly Clear

  • Tuesday

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

    High: 97 °F

    Hot

  • Tuesday Night

    Tuesday Night: Clear, with a low around 76.

    Low: 76 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

Detailed Forecast

This Afternoon
Showers and thunderstorms likely, mainly before 4pm. Partly sunny, with a high near 84. West wind around 5 mph. Chance of precipitation is 70%.
Tonight
A 50 percent chance of showers and thunderstorms, mainly after midnight. Mostly cloudy, with a low around 71. Southeast wind around 5 mph becoming calm.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 93. Heat index values as high as 105. South wind 6 to 11 mph.
Sunday Night
Increasing clouds, with a low around 74. South wind 6 to 10 mph.
Monday
Mostly sunny, with a high near 95. South wind 7 to 11 mph.
Monday Night
Mostly clear, with a low around 75.
Tuesday
Sunny and hot, with a high near 97.
Tuesday Night
Clear, with a low around 76.
Wednesday
Sunny, with a high near 96.
Wednesday Night
Mostly clear, with a low around 75.
Thursday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 95.
Thursday Night
Partly cloudy, with a low around 75.
Friday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 94.
Friday Night
A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 74.
Independence Day
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 93.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles E Dow IL
 39.04°N 90.24°W (Elev. 600 ft)
Last Update:
2:31 pm CDT Jun 27, 2026
Forecast Valid:
3pm CDT Jun 27, 2026-6pm CDT Jul 4, 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