National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

77°F

25°C

Humidity 85%
Wind Speed SW 3 mph
Barometer 30.00 in (1015.3 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 18 Jul 12:54 am CDT
Extended Forecast for

Whiteside MO

  • Overnight

    Overnight: Clear, with a low around 74. West wind around 5 mph.

    Low: 74 °F

    Clear

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 91. Heat index values as high as 100. West wind 6 to 8 mph, with gusts as high as 20 mph.

    High: 91 °F

    Sunny then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms between 9pm and 2am. Partly cloudy, with a low around 73. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 73 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Heat index values as high as 100. Light east wind.

    High: 89 °F

    Mostly Sunny
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of thunderstorms before 7pm. Partly cloudy, with a low around 71. Calm wind. Chance of precipitation is 30%.

    Low: 71 °F

    Chance
    T-storms then
    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

  • Monday Night

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

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 92.

    High: 92 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 74. West wind around 5 mph.
Saturday
A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 91. Heat index values as high as 100. West wind 6 to 8 mph, with gusts as high as 20 mph.
Saturday Night
A slight chance of showers and thunderstorms between 9pm and 2am. Partly cloudy, with a low around 73. West wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Sunday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Heat index values as high as 100. Light east wind.
Sunday Night
A chance of thunderstorms before 7pm. Partly cloudy, with a low around 71. Calm wind. Chance of precipitation is 30%.
Monday
Sunny, with a high near 92.
Monday Night
Mostly clear, with a low around 76.
Tuesday
Sunny, with a high near 92.
Tuesday Night
Mostly clear, with a low around 68.
Wednesday
Sunny, with a high near 84.
Wednesday Night
Mostly clear, with a low around 63.
Thursday
Mostly sunny, with a high near 81.
Thursday Night
A 30 percent chance of showers. Partly cloudy, with a low around 65.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 84.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Whiteside MO
 39.17°N 91.01°W (Elev. 712 ft)
Last Update:
1:26 am CDT Jul 18, 2026
Forecast Valid:
1am CDT Jul 18, 2026-6pm CDT Jul 24, 2026
 
Forecast Discussion
 
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Additional Resources

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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