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.

Overcast

69°F

21°C

Humidity 93%
Wind Speed E 5 mph
Barometer 30.06 in (1017.5 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 24 Jul 10:54 pm CDT
Extended Forecast for

2 Miles W Grafton IL

Heat Advisory July 26, 11:00am until July 27, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms. Cloudy, with a low around 69. South wind around 5 mph.

    Low: 69 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms, mainly before noon. Mostly cloudy, with a high near 86. South wind around 6 mph becoming light and variable in the afternoon.

    High: 86 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 72. Light and variable wind.

    Low: 72 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 93. Heat index values as high as 103. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 93 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 75. South wind 3 to 5 mph.

    Low: 75 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 77.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 94.

    High: 94 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy

Detailed Forecast

Tonight
A 40 percent chance of showers and thunderstorms. Cloudy, with a low around 69. South wind around 5 mph.
Saturday
A 40 percent chance of showers and thunderstorms, mainly before noon. Mostly cloudy, with a high near 86. South wind around 6 mph becoming light and variable in the afternoon.
Saturday Night
Partly cloudy, with a low around 72. Light and variable wind.
Sunday
Mostly sunny, with a high near 93. Heat index values as high as 103. Calm wind becoming southwest around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 75. South wind 3 to 5 mph.
Monday
Mostly sunny and hot, with a high near 97.
Monday Night
Mostly clear, with a low around 77.
Tuesday
Sunny, with a high near 94.
Tuesday Night
Partly cloudy, with a low around 73.
Wednesday
Mostly sunny, with a high near 92.
Wednesday Night
Partly cloudy, with a low around 72.
Thursday
Mostly sunny, with a high near 91.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 72.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles W Grafton IL
 38.98°N 90.47°W (Elev. 689 ft)
Last Update:
9:56 pm CDT Jul 24, 2026
Forecast Valid:
11pm CDT Jul 24, 2026-6pm CDT Jul 31, 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