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

42°F

6°C

Humidity 76%
Wind Speed E 8 mph
Barometer 30.00 in (1016.0 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Wind Chill37°F (3°C)
Last update 9 Feb 5:54 pm CST
Extended Forecast for

Rockbridge IL

  • Tonight

    Tonight: Mostly clear, with a low around 41. South wind 7 to 10 mph.

    Low: 41 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 55. Southwest wind 7 to 14 mph becoming north in the morning. Winds could gust as high as 21 mph.

    High: 55 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 27. North wind 6 to 8 mph.

    Low: 27 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 48. Northwest wind around 6 mph.

    High: 48 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 30. Light and variable wind.

    Low: 30 °F

    Mostly Cloudy

  • Thursday

    Thursday: Cloudy, with a high near 43.

    High: 43 °F

    Cloudy

  • Thursday Night

    Thursday Night: A 30 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 29.

    Low: 29 °F

    Chance Rain

  • Friday

    Friday: Partly sunny, with a high near 45.

    High: 45 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 32.

    Low: 32 °F

    Chance Rain

Detailed Forecast

Tonight
Mostly clear, with a low around 41. South wind 7 to 10 mph.
Tuesday
Sunny, with a high near 55. Southwest wind 7 to 14 mph becoming north in the morning. Winds could gust as high as 21 mph.
Tuesday Night
Mostly clear, with a low around 27. North wind 6 to 8 mph.
Wednesday
Mostly sunny, with a high near 48. Northwest wind around 6 mph.
Wednesday Night
Mostly cloudy, with a low around 30. Light and variable wind.
Thursday
Cloudy, with a high near 43.
Thursday Night
A 30 percent chance of rain, mainly before midnight. Mostly cloudy, with a low around 29.
Friday
Partly sunny, with a high near 45.
Friday Night
A 30 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 32.
Saturday
Rain likely, mainly after noon. Cloudy, with a high near 47. Chance of precipitation is 70%.
Saturday Night
Rain. Low around 34. Chance of precipitation is 80%.
Sunday
A 40 percent chance of rain. Mostly sunny, with a high near 49.
Sunday Night
Mostly clear, with a low around 30.
Washington's Birthday
Mostly sunny, with a high near 55.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Rockbridge IL
 39.26°N 90.2°W (Elev. 509 ft)
Last Update:
4:51 pm CST Feb 9, 2026
Forecast Valid:
6pm CST Feb 9, 2026-6pm CST Feb 16, 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