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

69°F

21°C

Humidity 73%
Wind Speed E 5 mph
Barometer 29.93 in (1012.9 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 20 Jun 11:54 pm CDT
Extended Forecast for

3 Miles SE Hardin IL

Flood Warning until further notice
Flood Watch June 21, 07:00am until June 22, 01:00am
Click here for hazard details and duration
Flood Warning until further notice
Flood Watch
  •  
    Flood Warning until further notice

    NOW until further notice

    Flood Warning

  • Overnight

    Low: 68 °F

    Mostly Cloudy

  • Sunday

    Sunday: Showers and thunderstorms. Some of the storms could produce heavy rainfall. High near 81. East wind 9 to 13 mph becoming southwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 90%.

    High: 81 °F

    Heavy Rain

  • Sunday Night

    Sunday Night: Showers and thunderstorms, mainly before midnight. Low around 60. Southwest wind 7 to 9 mph becoming north after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 80%.

    Low: 60 °F

    T-storms then
    Slight Chance
    T-storms

  • Monday

    Monday: Cloudy, then gradually becoming mostly sunny, with a high near 76. North wind around 9 mph.

    High: 76 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a low around 59. North wind around 6 mph becoming calm in the evening.

    Low: 59 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

Detailed Forecast

Overnight
Mostly cloudy, with a low around 68. Calm wind becoming east around 6 mph.
Sunday
Showers and thunderstorms. Some of the storms could produce heavy rainfall. High near 81. East wind 9 to 13 mph becoming southwest in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 90%.
Sunday Night
Showers and thunderstorms, mainly before midnight. Low around 60. Southwest wind 7 to 9 mph becoming north after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 80%.
Monday
Cloudy, then gradually becoming mostly sunny, with a high near 76. North wind around 9 mph.
Monday Night
Partly cloudy, with a low around 59. North wind around 6 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 79.
Tuesday Night
Mostly clear, with a low around 61.
Wednesday
Mostly sunny, with a high near 82.
Wednesday Night
Partly cloudy, with a low around 60.
Thursday
A 20 percent chance of showers before 1pm. Mostly sunny, with a high near 81.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 60.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SE Hardin IL
 39.12°N 90.58°W (Elev. 430 ft)
Last Update:
11:51 pm CDT Jun 20, 2026
Forecast Valid:
12am CDT Jun 21, 2026-6pm CDT Jun 27, 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