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

63°F

17°C

Humidity 81%
Wind Speed W 10 mph
Barometer 29.79 in (1008.6 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 26 Dec 10:54 am CST
Extended Forecast for

Rockbridge IL

  • Today

    Today: Mostly cloudy, with a high near 59. West wind 6 to 10 mph.

    High: 59 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, with a low around 43. Calm wind becoming southeast around 5 mph after midnight.

    Low: 43 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 63. Southeast wind 6 to 13 mph, with gusts as high as 20 mph.

    High: 63 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A chance of rain, with thunderstorms also possible after 3am. Cloudy, with a low around 57. South wind 7 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

    Low: 57 °F

    Chance Rain

  • Sunday

    Sunday: Rain and possibly a thunderstorm. High near 67. South wind 7 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%.

    High: 67 °F

    Rain

  • Sunday Night

    Sunday Night: A chance of rain, mixing with snow after 9pm, then gradually ending. Mostly cloudy, with a low around 18. Blustery. Chance of precipitation is 50%.

    Low: 18 °F

    Blustery.
    Chance
    Rain/Snow
    then Mostly
    Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 26. Blustery.

    High: 26 °F

    Mostly Sunny
    and Blustery

  • Monday Night

    Monday Night: Mostly clear, with a low around 15.

    Low: 15 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 35.

    High: 35 °F

    Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 59. West wind 6 to 10 mph.
Tonight
Mostly cloudy, with a low around 43. Calm wind becoming southeast around 5 mph after midnight.
Saturday
Mostly cloudy, with a high near 63. Southeast wind 6 to 13 mph, with gusts as high as 20 mph.
Saturday Night
A chance of rain, with thunderstorms also possible after 3am. Cloudy, with a low around 57. South wind 7 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Sunday
Rain and possibly a thunderstorm. High near 67. South wind 7 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 90%.
Sunday Night
A chance of rain, mixing with snow after 9pm, then gradually ending. Mostly cloudy, with a low around 18. Blustery. Chance of precipitation is 50%.
Monday
Mostly sunny, with a high near 26. Blustery.
Monday Night
Mostly clear, with a low around 15.
Tuesday
Sunny, with a high near 35.
Tuesday Night
Partly cloudy, with a low around 23.
Wednesday
Mostly sunny, with a high near 37.
Wednesday Night
Partly cloudy, with a low around 18.
New Year's Day
Partly sunny, with a high near 32.
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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:
8:26 am CST Dec 26, 2025
Forecast Valid:
11am CST Dec 26, 2025-6pm CST Jan 1, 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