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.

Overcast

41°F

5°C

Humidity 70%
Wind Speed NW 16 G 24 mph
Barometer 30.23 in (1023.6 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 11 Mar 8:54 pm CDT
Extended Forecast for

Rockbridge IL

  • Tonight

    Tonight: Mostly clear, with a low around 29. Northwest wind 12 to 17 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 25 mph.

    Low: 29 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 53. Light west wind becoming southwest 8 to 13 mph in the morning. Winds could gust as high as 20 mph.

    High: 53 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 40. Breezy, with a south wind 13 to 20 mph, with gusts as high as 32 mph.

    Low: 40 °F

    Partly Cloudy
    then Partly
    Cloudy and
    Breezy

  • Friday

    Friday: Partly sunny, with a high near 57. West wind 13 to 17 mph, with gusts as high as 25 mph.

    High: 57 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 33. Northwest wind 5 to 7 mph becoming northeast after midnight.

    Low: 33 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 57.

    High: 57 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 20 percent chance of rain after 1am. Cloudy, with a low around 46.

    Low: 46 °F

    Cloudy then
    Slight Chance
    Rain

  • Sunday

    Sunday: Rain likely and possibly a thunderstorm, then rain after 1pm. High near 63. Breezy. Chance of precipitation is 80%.

    High: 63 °F

    Rain and
    Breezy

  • Sunday Night

    Sunday Night: A chance of rain and snow before 1am. Mostly cloudy, with a low around 20. Blustery. Chance of precipitation is 30%.

    Low: 20 °F

    Chance
    Rain/Snow and
    Blustery

Detailed Forecast

Tonight
Mostly clear, with a low around 29. Northwest wind 12 to 17 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 25 mph.
Thursday
Sunny, with a high near 53. Light west wind becoming southwest 8 to 13 mph in the morning. Winds could gust as high as 20 mph.
Thursday Night
Partly cloudy, with a low around 40. Breezy, with a south wind 13 to 20 mph, with gusts as high as 32 mph.
Friday
Partly sunny, with a high near 57. West wind 13 to 17 mph, with gusts as high as 25 mph.
Friday Night
Mostly cloudy, with a low around 33. Northwest wind 5 to 7 mph becoming northeast after midnight.
Saturday
Mostly cloudy, with a high near 57.
Saturday Night
A 20 percent chance of rain after 1am. Cloudy, with a low around 46.
Sunday
Rain likely and possibly a thunderstorm, then rain after 1pm. High near 63. Breezy. Chance of precipitation is 80%.
Sunday Night
A chance of rain and snow before 1am. Mostly cloudy, with a low around 20. Blustery. Chance of precipitation is 30%.
Monday
Partly sunny, with a high near 32. Breezy.
Monday Night
Mostly clear, with a low around 13.
Tuesday
Partly sunny, with a high near 39.
Tuesday Night
A slight chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 20%.
Wednesday
Mostly cloudy, with a high near 53.
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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:
5:36 pm CDT Mar 11, 2026
Forecast Valid:
9pm CDT Mar 11, 2026-6pm CDT Mar 18, 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