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 Rain Fog/Mist

39°F

4°C

Humidity 96%
Wind Speed E 6 mph
Barometer 30.07 in (1018.4 mb)
Dewpoint 38°F (3°C)
Visibility 2.00 mi
Wind Chill35°F (2°C)
Last update 3 Mar 3:54 am CST
Extended Forecast for

3 Miles ENE Portage Des Sioux MO

  • Overnight

    Overnight: Showers and possibly a thunderstorm. Patchy fog. Low around 38. East wind around 5 mph. Chance of precipitation is 100%.

    Low: 38 °F

    Showers and
    Patchy Fog

  • Tuesday

    Tuesday: Showers and thunderstorms before 1pm, then showers and possibly a thunderstorm, mainly after 1pm. Patchy fog before 10am. High near 56. East wind around 6 mph becoming northeast in the afternoon. Chance of precipitation is 100%.

    High: 56 °F

    Showers and
    Patchy Fog

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 47. Northeast wind 5 to 7 mph. Chance of precipitation is 80%.

    Low: 47 °F

    Showers

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm before noon, then showers between noon and 3pm, then showers and possibly a thunderstorm after 3pm. High near 62. East wind 5 to 7 mph becoming south in the afternoon. Chance of precipitation is 90%.

    High: 62 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers and possibly a thunderstorm. Low around 53. Southwest wind around 6 mph. Chance of precipitation is 90%.

    Low: 53 °F

    Showers

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before noon, then a chance of showers. Mostly cloudy, with a high near 68. Chance of precipitation is 70%.

    High: 68 °F

    Showers
    Likely then
    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 56. Chance of precipitation is 60%.

    Low: 56 °F

    Chance
    Showers then
    Showers
    Likely

  • Friday

    Friday: A chance of showers and thunderstorms. Mostly cloudy, with a high near 78. Chance of precipitation is 50%.

    High: 78 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers, then showers and possibly a thunderstorm after midnight. Low around 58. Chance of precipitation is 80%.

    Low: 58 °F

    Chance
    Showers then
    Showers

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Patchy fog. Low around 38. East wind around 5 mph. Chance of precipitation is 100%.
Tuesday
Showers and thunderstorms before 1pm, then showers and possibly a thunderstorm, mainly after 1pm. Patchy fog before 10am. High near 56. East wind around 6 mph becoming northeast in the afternoon. Chance of precipitation is 100%.
Tuesday Night
Showers and possibly a thunderstorm. Low around 47. Northeast wind 5 to 7 mph. Chance of precipitation is 80%.
Wednesday
Showers and possibly a thunderstorm before noon, then showers between noon and 3pm, then showers and possibly a thunderstorm after 3pm. High near 62. East wind 5 to 7 mph becoming south in the afternoon. Chance of precipitation is 90%.
Wednesday Night
Showers and possibly a thunderstorm. Low around 53. Southwest wind around 6 mph. Chance of precipitation is 90%.
Thursday
Showers likely and possibly a thunderstorm before noon, then a chance of showers. Mostly cloudy, with a high near 68. Chance of precipitation is 70%.
Thursday Night
A chance of showers, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 56. Chance of precipitation is 60%.
Friday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 78. Chance of precipitation is 50%.
Friday Night
A chance of showers, then showers and possibly a thunderstorm after midnight. Low around 58. Chance of precipitation is 80%.
Saturday
A 50 percent chance of showers and thunderstorms, mainly before noon. Mostly cloudy, with a high near 69.
Saturday Night
Mostly cloudy, with a low around 42.
Sunday
Mostly sunny, with a high near 68.
Sunday Night
Mostly clear, with a low around 48.
Monday
A 20 percent chance of showers. Sunny, with a high near 73.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ENE Portage Des Sioux MO
 38.93°N 90.27°W (Elev. 407 ft)
Last Update:
12:26 am CST Mar 3, 2026
Forecast Valid:
4am CST Mar 3, 2026-6pm CDT Mar 9, 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