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.

Mostly Cloudy

75°F

24°C

Humidity 66%
Wind Speed Calm
Barometer 30.02 in (1016.0 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 20 Jun 7:54 am CDT
Extended Forecast for

3 Miles NNW Saint Charles MO

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

  • Today

    Today: Mostly sunny, with a high near 85. Calm wind becoming northwest around 5 mph.

    High: 85 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 69. North wind around 6 mph becoming east after midnight.

    Low: 69 °F

    Mostly Cloudy

  • Sunday

    Sunday: Showers and thunderstorms. Some of the storms could produce heavy rainfall. High near 83. Southeast wind 9 to 15 mph becoming south in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 100%.

    High: 83 °F

    Heavy Rain

  • Sunday Night

    Sunday Night: Showers and thunderstorms, mainly before 1am. Low around 63. Southwest wind 8 to 11 mph becoming northwest after midnight. Chance of precipitation is 80%.

    Low: 63 °F

    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 78. North wind around 10 mph.

    High: 78 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 61.

    Low: 61 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 85. Calm wind becoming northwest around 5 mph.
Tonight
Mostly cloudy, with a low around 69. North wind around 6 mph becoming east after midnight.
Sunday
Showers and thunderstorms. Some of the storms could produce heavy rainfall. High near 83. Southeast wind 9 to 15 mph becoming south in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 100%.
Sunday Night
Showers and thunderstorms, mainly before 1am. Low around 63. Southwest wind 8 to 11 mph becoming northwest after midnight. Chance of precipitation is 80%.
Monday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 78. North wind around 10 mph.
Monday Night
Partly cloudy, with a low around 61.
Tuesday
Sunny, with a high near 81.
Tuesday Night
Mostly clear, with a low around 63.
Wednesday
Mostly sunny, with a high near 84.
Wednesday Night
Partly cloudy, with a low around 63.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 82.
Thursday Night
A 30 percent chance of showers. Partly cloudy, with a low around 63.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Saint Charles MO
 38.83°N 90.54°W (Elev. 427 ft)
Last Update:
5:36 am CDT Jun 20, 2026
Forecast Valid:
8am CDT Jun 20, 2026-6pm CDT Jun 26, 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