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

87°F

31°C

Humidity 70%
Wind Speed N 6 mph
Barometer 29.89 in (1011.5 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index98°F (37°C)
Last update 12 Aug 11:54 am CDT
Extended Forecast for

Whiteside MO

Heat Advisory August 12, 12:46pm until August 13, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 12, 12:46pm until August 13, 08:00pm

    NOW until 8:00pm Thu

    Heat Advisory

  • This Afternoon

    High: 91 °F

    Showers
    Likely

  • Tonight

    Tonight: Scattered showers and thunderstorms, mainly after 5am. Partly cloudy, with a low around 75. Light and variable wind. Chance of precipitation is 30%.

    Low: 75 °F

    Partly Cloudy
    then
    Scattered
    T-storms

  • Thursday

    Thursday: Scattered showers and thunderstorms before 11am, then isolated showers and thunderstorms after 3pm. Mostly sunny, with a high near 94. Heat index values as high as 106. Light and variable wind becoming southwest around 6 mph in the morning. Chance of precipitation is 30%.

    High: 94 °F

    Scattered
    T-storms

  • Thursday Night

    Thursday Night: Isolated showers and thunderstorms. Increasing clouds, with a low around 75. East wind around 5 mph becoming south after midnight. Chance of precipitation is 20%.

    Low: 75 °F

    Isolated
    T-storms

  • Friday

    Friday: Mostly sunny, with a high near 95. South wind 3 to 5 mph.

    High: 95 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

Detailed Forecast

This Afternoon
Showers likely and possibly a thunderstorm before 2pm, then scattered showers and thunderstorms, mainly between 2pm and 3pm. Mostly cloudy, with a high near 91. Heat index values as high as 101. West wind 5 to 7 mph. Chance of precipitation is 70%.
Tonight
Scattered showers and thunderstorms, mainly after 5am. Partly cloudy, with a low around 75. Light and variable wind. Chance of precipitation is 30%.
Thursday
Scattered showers and thunderstorms before 11am, then isolated showers and thunderstorms after 3pm. Mostly sunny, with a high near 94. Heat index values as high as 106. Light and variable wind becoming southwest around 6 mph in the morning. Chance of precipitation is 30%.
Thursday Night
Isolated showers and thunderstorms. Increasing clouds, with a low around 75. East wind around 5 mph becoming south after midnight. Chance of precipitation is 20%.
Friday
Mostly sunny, with a high near 95. South wind 3 to 5 mph.
Friday Night
Mostly clear, with a low around 76.
Saturday
Sunny, with a high near 96.
Saturday Night
Mostly clear, with a low around 76.
Sunday
Sunny, with a high near 94.
Sunday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71.
Monday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85.
Monday Night
Partly cloudy, with a low around 67.
Tuesday
Mostly sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Whiteside MO
 39.17°N 91.01°W (Elev. 712 ft)
Last Update:
11:41 am CDT Aug 12, 2026
Forecast Valid:
12pm CDT Aug 12, 2026-6pm CDT Aug 18, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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