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

22°F

-6°C

Humidity 57%
Wind Speed NE 7 mph
Barometer 30.27 in (1025.4 mb)
Dewpoint 9°F (-13°C)
Visibility 10.00 mi
Wind Chill13°F (-11°C)
Last update 29 Jan 2:54 am CST
Extended Forecast for

Rockbridge IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 8. Northeast wind 3 to 5 mph.

    Low: 8 °F

    Mostly Cloudy

  • Thursday

    Thursday: A slight chance of snow between 4pm and 5pm. Cloudy and cold, with a high near 20. Northeast wind 5 to 7 mph. Chance of precipitation is 20%.

    High: 20 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Thursday Night

    Thursday Night: Cloudy, then gradually becoming partly cloudy, with a low around 1. North wind 3 to 6 mph.

    Low: 1 °F

    Decreasing
    Clouds

  • Friday

    Friday: Mostly sunny and cold, with a high near 16. Light north wind increasing to 5 to 10 mph in the morning.

    High: 16 °F

    Cold

  • Friday Night

    Friday Night: Partly cloudy, with a low around 1. North wind 8 to 10 mph.

    Low: 1 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny and cold, with a high near 18.

    High: 18 °F

    Cold

  • Saturday Night

    Saturday Night: Mostly clear, with a low around -1.

    Low: -1 °F

    Mostly Clear

  • Sunday

    Sunday: A 20 percent chance of snow after noon. Partly sunny, with a high near 25.

    High: 25 °F

    Partly Sunny
    then Slight
    Chance Snow

  • Sunday Night

    Sunday Night: A 30 percent chance of snow before midnight. Mostly cloudy, with a low around 15.

    Low: 15 °F

    Chance Snow
    then Mostly
    Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 8. Northeast wind 3 to 5 mph.
Thursday
A slight chance of snow between 4pm and 5pm. Cloudy and cold, with a high near 20. Northeast wind 5 to 7 mph. Chance of precipitation is 20%.
Thursday Night
Cloudy, then gradually becoming partly cloudy, with a low around 1. North wind 3 to 6 mph.
Friday
Mostly sunny and cold, with a high near 16. Light north wind increasing to 5 to 10 mph in the morning.
Friday Night
Partly cloudy, with a low around 1. North wind 8 to 10 mph.
Saturday
Mostly sunny and cold, with a high near 18.
Saturday Night
Mostly clear, with a low around -1.
Sunday
A 20 percent chance of snow after noon. Partly sunny, with a high near 25.
Sunday Night
A 30 percent chance of snow before midnight. Mostly cloudy, with a low around 15.
Monday
Partly sunny, with a high near 32.
Monday Night
Mostly cloudy, with a low around 16.
Tuesday
Mostly cloudy, with a high near 34.
Tuesday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 21.
Wednesday
A 30 percent chance of snow. Mostly cloudy, 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:
3:16 am CST Jan 29, 2026
Forecast Valid:
3am CST Jan 29, 2026-6pm CST Feb 4, 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