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

62°F

17°C

Humidity 29%
Wind Speed W 7 mph
Barometer 29.85 in (1010.6 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Last update 27 Feb 6:54 pm CST
Extended Forecast for

Rockbridge IL

  • Tonight

    Tonight: Clear, with a low around 32. West wind 6 to 8 mph becoming northeast after midnight.

    Low: 32 °F

    Clear

  • Saturday

    Saturday: A slight chance of rain between 2pm and 4pm. Sunny, with a high near 62. Northeast wind 7 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 20%.

    High: 62 °F

    Sunny then
    Slight Chance
    Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 26. Southeast wind 7 to 11 mph becoming north in the evening. Winds could gust as high as 22 mph.

    Low: 26 °F

    Partly Cloudy

  • Sunday

    Sunday: A slight chance of rain after noon, mixing with snow after 3pm. Mostly cloudy, with a high near 43. Northeast wind around 11 mph. Chance of precipitation is 20%.

    High: 43 °F

    Mostly Cloudy
    then Slight
    Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: Rain and snow before 3am, then snow and freezing rain likely. Low around 29. East wind around 10 mph. Chance of precipitation is 80%. New ice accumulation of less than a 0.1 of an inch possible. New snow accumulation of less than one inch possible.

    Low: 29 °F

    Wintry Mix

  • Monday

    Monday: A chance of rain, snow, and freezing rain before noon, then a slight chance of rain. Cloudy, with a high near 42. Chance of precipitation is 40%.

    High: 42 °F

    Chance Wintry
    Mix then
    Slight Chance
    Rain

  • Monday Night

    Monday Night: Rain likely, mainly after midnight. Cloudy, with a low around 35. Chance of precipitation is 70%.

    Low: 35 °F

    Rain Likely

  • Tuesday

    Tuesday: Rain, with thunderstorms also possible after noon. High near 54. Chance of precipitation is 80%.

    High: 54 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain likely, with thunderstorms also possible after midnight. Cloudy, with a low around 40. Chance of precipitation is 70%.

    Low: 40 °F

    Rain Likely

Detailed Forecast

Tonight
Clear, with a low around 32. West wind 6 to 8 mph becoming northeast after midnight.
Saturday
A slight chance of rain between 2pm and 4pm. Sunny, with a high near 62. Northeast wind 7 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 20%.
Saturday Night
Partly cloudy, with a low around 26. Southeast wind 7 to 11 mph becoming north in the evening. Winds could gust as high as 22 mph.
Sunday
A slight chance of rain after noon, mixing with snow after 3pm. Mostly cloudy, with a high near 43. Northeast wind around 11 mph. Chance of precipitation is 20%.
Sunday Night
Rain and snow before 3am, then snow and freezing rain likely. Low around 29. East wind around 10 mph. Chance of precipitation is 80%. New ice accumulation of less than a 0.1 of an inch possible. New snow accumulation of less than one inch possible.
Monday
A chance of rain, snow, and freezing rain before noon, then a slight chance of rain. Cloudy, with a high near 42. Chance of precipitation is 40%.
Monday Night
Rain likely, mainly after midnight. Cloudy, with a low around 35. Chance of precipitation is 70%.
Tuesday
Rain, with thunderstorms also possible after noon. High near 54. Chance of precipitation is 80%.
Tuesday Night
Rain likely, with thunderstorms also possible after midnight. Cloudy, with a low around 40. Chance of precipitation is 70%.
Wednesday
Rain likely and possibly a thunderstorm. Cloudy, with a high near 62. Chance of precipitation is 60%.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 47. Chance of precipitation is 70%.
Thursday
Rain likely. Mostly cloudy, with a high near 63. Chance of precipitation is 60%.
Thursday Night
A 50 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 48.
Friday
Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 67. Chance of precipitation is 60%.
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ABOUT THIS FORECAST

 
Point Forecast:
Rockbridge IL
 39.26°N 90.2°W (Elev. 509 ft)
Last Update:
5:06 pm CST Feb 27, 2026
Forecast Valid:
7pm CST Feb 27, 2026-6pm CST Mar 6, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation