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

48°F

9°C

Humidity 42%
Wind Speed N 6 mph
Barometer 30.02 in (1016.4 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 28 Feb 1:54 am CST
Extended Forecast for

Rockbridge IL

  • Overnight

    Overnight: Mostly clear, with a low around 34. North wind around 6 mph.

    Low: 34 °F

    Mostly Clear

  • Saturday

    Saturday: A slight chance of rain between 1pm and 3pm. Mostly sunny, with a high near 59. Northeast wind 5 to 8 mph becoming south in the afternoon. Chance of precipitation is 20%.

    High: 59 °F

    Mostly Sunny
    then Slight
    Chance Rain

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 25. North wind 6 to 11 mph, with gusts as high as 20 mph.

    Low: 25 °F

    Partly Cloudy

  • Sunday

    Sunday: Increasing clouds, with a high near 42. Northeast wind around 11 mph.

    High: 42 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Snow likely. Cloudy, with a low around 27. East wind around 9 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.

    Low: 27 °F

    Snow Likely

  • Monday

    Monday: A chance of snow before 9am, then a chance of rain. Cloudy, with a high near 41. Chance of precipitation is 30%.

    High: 41 °F

    Chance
    Rain/Snow
    then Slight
    Chance Rain

  • Monday Night

    Monday Night: Rain. Low around 34. Chance of precipitation is 90%.

    Low: 34 °F

    Rain Likely
    then Rain

  • Tuesday

    Tuesday: Rain and possibly a thunderstorm. High near 55. Chance of precipitation is 90%.

    High: 55 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 42. Chance of precipitation is 80%.

    Low: 42 °F

    Rain

Detailed Forecast

Overnight
Mostly clear, with a low around 34. North wind around 6 mph.
Saturday
A slight chance of rain between 1pm and 3pm. Mostly sunny, with a high near 59. Northeast wind 5 to 8 mph becoming south in the afternoon. Chance of precipitation is 20%.
Saturday Night
Partly cloudy, with a low around 25. North wind 6 to 11 mph, with gusts as high as 20 mph.
Sunday
Increasing clouds, with a high near 42. Northeast wind around 11 mph.
Sunday Night
Snow likely. Cloudy, with a low around 27. East wind around 9 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.
Monday
A chance of snow before 9am, then a chance of rain. Cloudy, with a high near 41. Chance of precipitation is 30%.
Monday Night
Rain. Low around 34. Chance of precipitation is 90%.
Tuesday
Rain and possibly a thunderstorm. High near 55. Chance of precipitation is 90%.
Tuesday Night
Rain and possibly a thunderstorm. Low around 42. Chance of precipitation is 80%.
Wednesday
Rain likely and possibly a thunderstorm. Cloudy, with a high near 62. Chance of precipitation is 70%.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 46. Chance of precipitation is 60%.
Thursday
A 50 percent chance of rain. Partly sunny, with a high near 65.
Thursday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 51.
Friday
Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 69. Chance of precipitation is 70%.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Rockbridge IL
 39.26°N 90.2°W (Elev. 509 ft)
Last Update:
1:36 am CST Feb 28, 2026
Forecast Valid:
2am CST Feb 28, 2026-6pm CST Mar 6, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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