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

71°F

22°C

Humidity 90%
Wind Speed Calm
Barometer 30.03 in (1016.6 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 14 Oct 10:54 am CDT
Extended Forecast for

Rockbridge IL

  • Today

    Today: Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms between noon and 4pm, then a chance of showers after 4pm. Mostly cloudy, with a high near 77. North wind around 7 mph. Chance of precipitation is 60%.

    High: 77 °F

    Showers
    Likely

  • Tonight

    Tonight: A slight chance of showers, then a chance of showers and thunderstorms after 10pm. Mostly cloudy, with a low around 60. North wind 6 to 8 mph becoming east after midnight. Chance of precipitation is 30%.

    Low: 60 °F

    Chance
    T-storms

  • Thursday

    Thursday: Showers and possibly a thunderstorm, mainly before 3pm, then a chance of showers and thunderstorms after 3pm. Patchy fog between 9am and noon. High near 80. East wind 7 to 11 mph becoming southwest in the afternoon. Chance of precipitation is 90%.

    High: 80 °F

    Showers and
    Patchy Fog
    then Showers
    Likely

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Low around 43. Northwest wind 7 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 80%.

    Low: 43 °F

    Showers

  • Friday

    Friday: Mostly sunny, with a high near 60. Breezy, with a northwest wind 18 to 21 mph, with gusts as high as 33 mph.

    High: 60 °F

    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Mostly clear, with a low around 34.

    Low: 34 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 34.

    Low: 34 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 70.

    High: 70 °F

    Sunny

Detailed Forecast

Today
Showers likely and possibly a thunderstorm before noon, then a chance of showers and thunderstorms between noon and 4pm, then a chance of showers after 4pm. Mostly cloudy, with a high near 77. North wind around 7 mph. Chance of precipitation is 60%.
Tonight
A slight chance of showers, then a chance of showers and thunderstorms after 10pm. Mostly cloudy, with a low around 60. North wind 6 to 8 mph becoming east after midnight. Chance of precipitation is 30%.
Thursday
Showers and possibly a thunderstorm, mainly before 3pm, then a chance of showers and thunderstorms after 3pm. Patchy fog between 9am and noon. High near 80. East wind 7 to 11 mph becoming southwest in the afternoon. Chance of precipitation is 90%.
Thursday Night
Showers and possibly a thunderstorm. Low around 43. Northwest wind 7 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 80%.
Friday
Mostly sunny, with a high near 60. Breezy, with a northwest wind 18 to 21 mph, with gusts as high as 33 mph.
Friday Night
Mostly clear, with a low around 34.
Saturday
Sunny, with a high near 62.
Saturday Night
Clear, with a low around 34.
Sunday
Sunny, with a high near 70.
Sunday Night
Partly cloudy, with a low around 40.
Monday
Partly sunny, with a high near 73.
Monday Night
Partly cloudy, with a low around 44.
Tuesday
Mostly sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Rockbridge IL
 39.28°N 90.2°W (Elev. 531 ft)
Last Update:
5:06 am CDT Oct 14, 2026
Forecast Valid:
11am CDT Oct 14, 2026-6pm CDT Oct 20, 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