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

80°F

27°C

Humidity 79%
Wind Speed S 12 mph
Barometer 29.91 in (1012.2 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 21 Jun 1:54 am CDT
Extended Forecast for

5 Miles ENE Olney MO

Heat Advisory June 21, 12:00pm until June 24, 09:00pm
Click here for hazard details and duration
Heat Advisory

  • Overnight

    Overnight: Clear, with a low around 75. South wind around 9 mph, with gusts as high as 20 mph.

    Low: 75 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 94. Heat index values as high as 106. Southwest wind 10 to 17 mph, with gusts as high as 28 mph.

    High: 94 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 74. South wind 8 to 13 mph, with gusts as high as 24 mph.

    Low: 74 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 94. Heat index values as high as 102. Southwest wind 8 to 13 mph, with gusts as high as 25 mph.

    High: 94 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 74. South wind 6 to 10 mph, with gusts as high as 22 mph.

    Low: 74 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 93.

    High: 93 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 73.

    Low: 73 °F

    Partly Cloudy

Detailed Forecast

Overnight
Clear, with a low around 75. South wind around 9 mph, with gusts as high as 20 mph.
Saturday
Sunny, with a high near 94. Heat index values as high as 106. Southwest wind 10 to 17 mph, with gusts as high as 28 mph.
Saturday Night
Mostly clear, with a low around 74. South wind 8 to 13 mph, with gusts as high as 24 mph.
Sunday
Sunny, with a high near 94. Heat index values as high as 102. Southwest wind 8 to 13 mph, with gusts as high as 25 mph.
Sunday Night
Clear, with a low around 74. South wind 6 to 10 mph, with gusts as high as 22 mph.
Monday
Sunny, with a high near 95.
Monday Night
Mostly clear, with a low around 73.
Tuesday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 93.
Tuesday Night
Partly cloudy, with a low around 73.
Wednesday
A slight chance of showers, with thunderstorms also possible after 1pm. Sunny, with a high near 93. Chance of precipitation is 20%.
Wednesday Night
Partly cloudy, with a low around 73.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Thursday Night
A 30 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 88.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles ENE Olney MO
 39.11°N 91.15°W (Elev. 650 ft)
Last Update:
12:21 am CDT Jun 21, 2025
Forecast Valid:
2am CDT Jun 21, 2025-6pm CDT Jun 27, 2025
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation