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

24°F

-4°C

Humidity 75%
Wind Speed Calm
Barometer 30.34 in (1027.7 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Last update 12 Jan 4:54 am CST
Extended Forecast for

Rockbridge IL

  • Today

    Today: Sunny, with a high near 50. Southwest wind 8 to 10 mph.

    High: 50 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 33. Southwest wind 7 to 9 mph.

    Low: 33 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 56. West wind 9 to 16 mph, with gusts as high as 26 mph.

    High: 56 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 35. West wind 8 to 11 mph, with gusts as high as 20 mph.

    Low: 35 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Wednesday

    Wednesday: A slight chance of rain showers between noon and 3pm, then a slight chance of snow showers after 3pm. Mostly cloudy, with a temperature falling to around 31 by 5pm. Breezy, with a northwest wind 13 to 22 mph, with gusts as high as 32 mph. Chance of precipitation is 20%.

    High: 41 °F⇓

    Breezy.
    Mostly Cloudy
    then Slight
    Chance
    Rain/Snow

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 15.

    Low: 15 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 29.

    High: 29 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of snow showers before midnight. Mostly cloudy, with a low around 24.

    Low: 24 °F

    Slight Chance
    Snow Showers
    then Mostly
    Cloudy

  • Friday

    Friday: A 20 percent chance of snow showers after noon. Mostly cloudy, with a high near 40.

    High: 40 °F

    Partly Sunny
    then Slight
    Chance Snow
    Showers

Detailed Forecast

Today
Sunny, with a high near 50. Southwest wind 8 to 10 mph.
Tonight
Mostly clear, with a low around 33. Southwest wind 7 to 9 mph.
Tuesday
Increasing clouds, with a high near 56. West wind 9 to 16 mph, with gusts as high as 26 mph.
Tuesday Night
A 20 percent chance of showers before midnight. Mostly cloudy, with a low around 35. West wind 8 to 11 mph, with gusts as high as 20 mph.
Wednesday
A slight chance of rain showers between noon and 3pm, then a slight chance of snow showers after 3pm. Mostly cloudy, with a temperature falling to around 31 by 5pm. Breezy, with a northwest wind 13 to 22 mph, with gusts as high as 32 mph. Chance of precipitation is 20%.
Wednesday Night
Partly cloudy, with a low around 15.
Thursday
Mostly sunny, with a high near 29.
Thursday Night
A 20 percent chance of snow showers before midnight. Mostly cloudy, with a low around 24.
Friday
A 20 percent chance of snow showers after noon. Mostly cloudy, with a high near 40.
Friday Night
Mostly cloudy, with a low around 16.
Saturday
Mostly cloudy, with a high near 26.
Saturday Night
Partly cloudy, with a low around 8.
Sunday
Mostly sunny, with a high near 25.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Rockbridge IL
 39.26°N 90.2°W (Elev. 509 ft)
Last Update:
5:01 am CST Jan 12, 2026
Forecast Valid:
5am CST Jan 12, 2026-6pm CST Jan 18, 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