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.

Partly Cloudy

91°F

33°C

Humidity 56%
Wind Speed S 9 mph
Barometer 30.00 in (1015.4 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index100°F (38°C)
Last update 3 Jul 2:54 pm CDT
Extended Forecast for

2 Miles NNW Hardin IL

Heat Advisory July 3, 10:00pm until July 4, 08:00pm
Flood Warning July 3, 03:24pm until July 5, 07:00pm
Extreme Heat Warning July 3, 03:24pm until July 3, 10:00pm
Click here for hazard details and duration
Heat Advisory
Flood Warning
Extreme Heat Warning
  •  
    Flood Warning July 3, 03:24pm until July 5, 07:00pm
    Extreme Heat Warning July 3, 03:24pm until July 3, 10:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • This Afternoon

    High: 93 °F

    Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 73. Calm wind. Chance of precipitation is 20%.

    Low: 73 °F

    Slight Chance
    T-storms

  • Independence Day

    Independence Day: A 40 percent chance of showers and thunderstorms, mainly after noon. Sunny, with a high near 92. Heat index values as high as 100. West wind 3 to 6 mph.

    High: 92 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms, mainly after midnight. Partly cloudy, with a low around 72. Calm wind.

    Low: 72 °F

    Chance
    T-storms

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88. Light northwest wind.

    High: 88 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 69. Chance of precipitation is 40%.

    Low: 69 °F

    Chance
    Showers

  • Monday

    Monday: A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 85. Chance of precipitation is 20%.

    High: 85 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 67.

    Low: 67 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93. Heat index values as high as 103. Southwest wind around 6 mph.
Tonight
A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 73. Calm wind. Chance of precipitation is 20%.
Independence Day
A 40 percent chance of showers and thunderstorms, mainly after noon. Sunny, with a high near 92. Heat index values as high as 100. West wind 3 to 6 mph.
Saturday Night
A 40 percent chance of showers and thunderstorms, mainly after midnight. Partly cloudy, with a low around 72. Calm wind.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88. Light northwest wind.
Sunday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 69. Chance of precipitation is 40%.
Monday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 85. Chance of precipitation is 20%.
Monday Night
Partly cloudy, with a low around 67.
Tuesday
Mostly sunny, with a high near 86.
Tuesday Night
Partly cloudy, with a low around 68.
Wednesday
Sunny, with a high near 89.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Thursday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Hardin IL
 39.18°N 90.63°W (Elev. 689 ft)
Last Update:
2:11 pm CDT Jul 3, 2026
Forecast Valid:
3pm CDT Jul 3, 2026-6pm CDT Jul 10, 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