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.

Thunderstorm in Vicinity

97°F

36°C

Humidity 45%
Wind Speed S 5 mph
Barometer 29.96 in (1014.0 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index106°F (41°C)
Last update 18 Aug 3:54 pm CDT
Extended Forecast for

7 Miles ESE Whiteside MO

Heat Advisory August 18, 04:42pm until August 18, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 18, 04:42pm until August 18, 08:00pm

    NOW until 8:00pm Mon

    Heat Advisory

  • This Afternoon

    High: 94 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 4am. Partly cloudy, with a low around 73. South wind 3 to 5 mph.

    Low: 73 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms, mainly between 1pm and 3pm. Mostly sunny, with a high near 90. Heat index values as high as 100. Light and variable wind becoming northwest 5 to 7 mph in the morning.

    High: 90 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 71. North wind around 5 mph becoming calm after midnight. Chance of precipitation is 30%.

    Low: 71 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Mostly sunny, with a high near 84. Northeast wind 5 to 7 mph.

    High: 84 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94. Heat index values as high as 109. South wind around 6 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly after 4am. Partly cloudy, with a low around 73. South wind 3 to 5 mph.
Tuesday
A 20 percent chance of showers and thunderstorms, mainly between 1pm and 3pm. Mostly sunny, with a high near 90. Heat index values as high as 100. Light and variable wind becoming northwest 5 to 7 mph in the morning.
Tuesday Night
A chance of showers and thunderstorms between 7pm and 1am. Partly cloudy, with a low around 71. North wind around 5 mph becoming calm after midnight. Chance of precipitation is 30%.
Wednesday
Mostly sunny, with a high near 84. Northeast wind 5 to 7 mph.
Wednesday Night
Mostly clear, with a low around 64.
Thursday
Mostly sunny, with a high near 83.
Thursday Night
Mostly clear, with a low around 66.
Friday
Sunny, with a high near 86.
Friday Night
Mostly clear, with a low around 67.
Saturday
Mostly sunny, with a high near 83.
Saturday Night
Mostly clear, with a low around 60.
Sunday
Sunny, with a high near 78.
Sunday Night
Partly cloudy, with a low around 56.
Monday
Mostly sunny, with a high near 75.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
7 Miles ESE Whiteside MO
 39.15°N 90.92°W (Elev. 699 ft)
Last Update:
4:16 pm CDT Aug 18, 2025
Forecast Valid:
4pm CDT Aug 18, 2025-6pm CDT Aug 25, 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