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

60°F

16°C

Humidity 39%
Wind Speed NW 3 mph
Barometer 29.85 in (1010.8 mb)
Dewpoint 35°F (2°C)
Visibility 10.00 mi
Last update 26 Feb 3:54 pm CST
Extended Forecast for

Rockbridge IL

  • Tonight

    Tonight: Clear, with a low around 33. Calm wind becoming southwest around 5 mph after midnight.

    Low: 33 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 68. Southwest wind 5 to 15 mph, with gusts as high as 22 mph.

    High: 68 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 35. Southwest wind 6 to 9 mph becoming northeast after midnight.

    Low: 35 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of rain after noon. Mostly sunny, with a high near 57. East wind 6 to 10 mph.

    High: 57 °F

    Mostly Sunny
    then Slight
    Chance Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 25. North wind 10 to 13 mph, with gusts as high as 21 mph.

    Low: 25 °F

    Partly Cloudy

  • Sunday

    Sunday: A chance of rain and snow after noon. Mostly cloudy, with a high near 40. Chance of precipitation is 40%.

    High: 40 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: Rain and snow, mainly before midnight. Low around 25. Chance of precipitation is 80%.

    Low: 25 °F

    Rain/Snow
    then Chance
    Rain/Snow

  • Monday

    Monday: A slight chance of rain and snow before noon. Mostly cloudy, with a high near 39. Chance of precipitation is 20%.

    High: 39 °F

    Slight Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Monday Night

    Monday Night: A 40 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 27.

    Low: 27 °F

    Chance Rain

Detailed Forecast

Tonight
Clear, with a low around 33. Calm wind becoming southwest around 5 mph after midnight.
Friday
Sunny, with a high near 68. Southwest wind 5 to 15 mph, with gusts as high as 22 mph.
Friday Night
Mostly clear, with a low around 35. Southwest wind 6 to 9 mph becoming northeast after midnight.
Saturday
A 20 percent chance of rain after noon. Mostly sunny, with a high near 57. East wind 6 to 10 mph.
Saturday Night
Partly cloudy, with a low around 25. North wind 10 to 13 mph, with gusts as high as 21 mph.
Sunday
A chance of rain and snow after noon. Mostly cloudy, with a high near 40. Chance of precipitation is 40%.
Sunday Night
Rain and snow, mainly before midnight. Low around 25. Chance of precipitation is 80%.
Monday
A slight chance of rain and snow before noon. Mostly cloudy, with a high near 39. Chance of precipitation is 20%.
Monday Night
A 40 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 27.
Tuesday
A 50 percent chance of rain. Cloudy, with a high near 42.
Tuesday Night
Rain likely. Cloudy, with a low around 32. Chance of precipitation is 60%.
Wednesday
Rain likely. Cloudy, with a high near 54. Chance of precipitation is 60%.
Wednesday Night
Rain likely. Cloudy, with a low around 43. Chance of precipitation is 70%.
Thursday
Rain likely. Mostly cloudy, with a high near 64. Chance of precipitation is 60%.
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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:
2:11 pm CST Feb 26, 2026
Forecast Valid:
4pm CST Feb 26, 2026-6pm CST Mar 5, 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