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

87°F

31°C

Humidity 63%
Wind Speed SW 16 G 26 mph
Barometer 29.96 in (1013.8 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index94°F (34°C)
Last update 21 Jun 9:54 am CDT
Extended Forecast for

2 Miles S Dow IL

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

  • Today

    Today: Sunny, with a high near 95. Heat index values as high as 103. Southwest wind 13 to 16 mph, with gusts as high as 24 mph.

    High: 95 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 76. South wind 8 to 13 mph, with gusts as high as 21 mph.

    Low: 76 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 95. Heat index values as high as 100. Southwest wind 8 to 13 mph, with gusts as high as 20 mph.

    High: 95 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 76. South wind 7 to 10 mph.

    Low: 76 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 94. Southwest wind 6 to 9 mph.

    High: 94 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 75.

    Low: 75 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.

    High: 92 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 75.

    Low: 75 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93.

    High: 93 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 95. Heat index values as high as 103. Southwest wind 13 to 16 mph, with gusts as high as 24 mph.
Tonight
Clear, with a low around 76. South wind 8 to 13 mph, with gusts as high as 21 mph.
Sunday
Sunny, with a high near 95. Heat index values as high as 100. Southwest wind 8 to 13 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 76. South wind 7 to 10 mph.
Monday
Sunny, with a high near 94. Southwest wind 6 to 9 mph.
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 75.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93.
Wednesday Night
Mostly clear, with a low around 75.
Thursday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 93.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles S Dow IL
 39.02°N 90.3°W (Elev. 610 ft)
Last Update:
9:37 am CDT Jun 21, 2025
Forecast Valid:
10am CDT Jun 21, 2025-6pm CDT Jun 27, 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