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

53°F

12°C

Humidity 37%
Wind Speed Calm
Barometer 29.76 in (1007.8 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 25 Feb 12:54 pm CST
Extended Forecast for

Rockbridge IL

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 49. Northwest wind 3 to 5 mph.

    High: 49 °F

    Partly Sunny

  • Tonight

    Tonight: A 40 percent chance of rain, mainly before 3am. Mostly cloudy, with a low around 29. Northeast wind 3 to 6 mph.

    Low: 29 °F

    Chance Rain

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 52. East wind around 6 mph becoming light and variable in the afternoon.

    High: 52 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Clear, with a low around 32. Calm wind becoming south around 6 mph after midnight.

    Low: 32 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 68. Southwest wind 6 to 15 mph, with gusts as high as 23 mph.

    High: 68 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of rain after noon. Mostly sunny, with a high near 57.

    High: 57 °F

    Mostly Sunny
    then Slight
    Chance Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 26.

    Low: 26 °F

    Partly Cloudy

  • Sunday

    Sunday: A chance of snow before noon, then a chance of rain and snow. Cloudy, with a high near 39. Chance of precipitation is 50%.

    High: 39 °F

    Chance Snow
    then Chance
    Rain/Snow

Detailed Forecast

This Afternoon
Partly sunny, with a high near 49. Northwest wind 3 to 5 mph.
Tonight
A 40 percent chance of rain, mainly before 3am. Mostly cloudy, with a low around 29. Northeast wind 3 to 6 mph.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 52. East wind around 6 mph becoming light and variable in the afternoon.
Thursday Night
Clear, with a low around 32. Calm wind becoming south around 6 mph after midnight.
Friday
Sunny, with a high near 68. Southwest wind 6 to 15 mph, with gusts as high as 23 mph.
Friday Night
Mostly clear, with a low around 36.
Saturday
A 20 percent chance of rain after noon. Mostly sunny, with a high near 57.
Saturday Night
Partly cloudy, with a low around 26.
Sunday
A chance of snow before noon, then a chance of rain and snow. Cloudy, with a high near 39. Chance of precipitation is 50%.
Sunday Night
Rain and snow likely. Cloudy, with a low around 24. Chance of precipitation is 70%.
Monday
A slight chance of rain and snow. Mostly cloudy, with a high near 37. Chance of precipitation is 20%.
Monday Night
A 50 percent chance of rain. Cloudy, with a low around 23.
Tuesday
A 40 percent chance of rain. Mostly cloudy, with a high near 40.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Rockbridge IL
 39.26°N 90.2°W (Elev. 509 ft)
Last Update:
12:26 pm CST Feb 25, 2026
Forecast Valid:
1pm CST Feb 25, 2026-6pm CST Mar 3, 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