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.

Fog/Mist

77°F

25°C

Humidity 96%
Wind Speed Calm
Barometer 30.03 in (1016.3 mb)
Dewpoint 76°F (24°C)
Visibility 6.00 mi
Heat Index78°F (26°C)
Last update 30 Jul 6:54 am CDT
Extended Forecast for

Carrollton IL

Heat Advisory July 30, 07:07am until July 30, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory July 30, 07:07am until July 30, 07:00pm

    NOW until 7:00pm Wed

    Heat Advisory

  • Today

    High: 90 °F

    Chance
    T-storms and
    Patchy Fog

  • Tonight

    Tonight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 10pm. Low around 69. Northeast wind around 5 mph becoming northwest in the evening. Chance of precipitation is 80%.

    Low: 69 °F

    T-storms

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 76. North wind 6 to 11 mph, with gusts as high as 20 mph.

    High: 76 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 61. North wind 9 to 11 mph, with gusts as high as 20 mph.

    Low: 61 °F

    Mostly Cloudy

  • Friday

    Friday: Sunny, with a high near 77. Northeast wind 9 to 11 mph.

    High: 77 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 77.

    High: 77 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 57.

    Low: 57 °F

    Mostly Clear

Detailed Forecast

Today
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 90. Heat index values as high as 103. Calm wind becoming north around 5 mph in the afternoon.
Tonight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 10pm. Low around 69. Northeast wind around 5 mph becoming northwest in the evening. Chance of precipitation is 80%.
Thursday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 76. North wind 6 to 11 mph, with gusts as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around 61. North wind 9 to 11 mph, with gusts as high as 20 mph.
Friday
Sunny, with a high near 77. Northeast wind 9 to 11 mph.
Friday Night
Mostly clear, with a low around 57.
Saturday
Sunny, with a high near 77.
Saturday Night
Mostly clear, with a low around 57.
Sunday
Sunny, with a high near 80.
Sunday Night
Partly cloudy, with a low around 62.
Monday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 81.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 64.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Carrollton IL
 39.29°N 90.4°W (Elev. 568 ft)
Last Update:
5:41 am CDT Jul 30, 2025
Forecast Valid:
7am CDT Jul 30, 2025-6pm CDT Aug 5, 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