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

59°F

15°C

Humidity 87%
Wind Speed S 8 mph
Barometer 29.77 in (1007.6 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 15 Nov 3:54 am CST
Extended Forecast for

4 Miles WSW Rockbridge IL

  • Today

    Today: Mostly cloudy through mid morning, then gradual clearing, with a high near 76. Southwest wind 9 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 26 mph.

    High: 76 °F

    Becoming
    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 38. North wind 6 to 11 mph, with gusts as high as 22 mph.

    Low: 38 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 57. North wind 3 to 6 mph.

    High: 57 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 33. Calm wind.

    Low: 33 °F

    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers after noon. Mostly sunny, with a high near 58. Light east wind becoming southeast 6 to 11 mph in the morning.

    High: 58 °F

    Sunny then
    Slight Chance
    Showers

  • Monday Night

    Monday Night: Showers likely. Mostly cloudy, with a low around 43. Chance of precipitation is 70%.

    Low: 43 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Partly sunny, with a high near 61.

    High: 61 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40.

    Low: 40 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of rain, mainly after noon. Partly sunny, with a high near 59.

    High: 59 °F

    Chance Rain

Detailed Forecast

Today
Mostly cloudy through mid morning, then gradual clearing, with a high near 76. Southwest wind 9 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 26 mph.
Tonight
Mostly clear, with a low around 38. North wind 6 to 11 mph, with gusts as high as 22 mph.
Sunday
Sunny, with a high near 57. North wind 3 to 6 mph.
Sunday Night
Mostly clear, with a low around 33. Calm wind.
Monday
A 20 percent chance of showers after noon. Mostly sunny, with a high near 58. Light east wind becoming southeast 6 to 11 mph in the morning.
Monday Night
Showers likely. Mostly cloudy, with a low around 43. Chance of precipitation is 70%.
Tuesday
Partly sunny, with a high near 61.
Tuesday Night
Mostly cloudy, with a low around 40.
Wednesday
A 30 percent chance of rain, mainly after noon. Partly sunny, with a high near 59.
Wednesday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 45. Chance of precipitation is 60%.
Thursday
Rain. High near 61. Chance of precipitation is 80%.
Thursday Night
Rain likely. Mostly cloudy, with a low around 47. Chance of precipitation is 60%.
Friday
A 40 percent chance of rain. Mostly cloudy, with a high near 61.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WSW Rockbridge IL
 39.26°N 90.26°W (Elev. 515 ft)
Last Update:
3:16 am CST Nov 15, 2025
Forecast Valid:
4am CST Nov 15, 2025-6pm CST Nov 21, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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