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

54°F

12°C

Humidity 69%
Wind Speed W 5 mph
Barometer 29.95 in (1014.2 mb)
Dewpoint 44°F (7°C)
Visibility 10.00 mi
Wind Chill53°F (12°C)
Last update 15 Feb 1:54 pm CST
Extended Forecast for

Rockbridge IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 57. West wind 3 to 6 mph.

    High: 57 °F

    Mostly Sunny

  • Tonight

    Tonight: Patchy fog between 3am and 5am. Otherwise, partly cloudy, with a low around 38. Calm wind becoming south around 5 mph after midnight.

    Low: 38 °F

    Mostly Clear
    then Patchy
    Fog

  • Washington's Birthday

    Washington's Birthday: Partly sunny, with a high near 64. South wind 5 to 13 mph, with gusts as high as 22 mph.

    High: 64 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 41. South wind around 8 mph.

    Low: 41 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 63. South wind 7 to 15 mph, with gusts as high as 23 mph.

    High: 63 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of rain after noon. Partly sunny, with a high near 69.

    High: 69 °F

    Partly Sunny
    then Slight
    Chance Rain

  • Wednesday Night

    Wednesday Night: A 20 percent chance of rain. Partly cloudy, with a low around 43.

    Low: 43 °F

    Slight Chance
    Rain

  • Thursday

    Thursday: A 20 percent chance of rain. Sunny, with a high near 61.

    High: 61 °F

    Slight Chance
    Rain

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 57. West wind 3 to 6 mph.
Tonight
Patchy fog between 3am and 5am. Otherwise, partly cloudy, with a low around 38. Calm wind becoming south around 5 mph after midnight.
Washington's Birthday
Partly sunny, with a high near 64. South wind 5 to 13 mph, with gusts as high as 22 mph.
Monday Night
Mostly cloudy, with a low around 41. South wind around 8 mph.
Tuesday
Mostly cloudy, with a high near 63. South wind 7 to 15 mph, with gusts as high as 23 mph.
Tuesday Night
Mostly cloudy, with a low around 51.
Wednesday
A 20 percent chance of rain after noon. Partly sunny, with a high near 69.
Wednesday Night
A 20 percent chance of rain. Partly cloudy, with a low around 43.
Thursday
A 20 percent chance of rain. Sunny, with a high near 61.
Thursday Night
A slight chance of rain before midnight, then a slight chance of rain and snow. Partly cloudy, with a low around 35. Chance of precipitation is 20%.
Friday
A slight chance of rain and snow. Partly sunny, with a high near 54. Chance of precipitation is 20%.
Friday Night
A 20 percent chance of snow. Low around 32.
Saturday
High near 48.
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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:
12:31 pm CST Feb 15, 2026
Forecast Valid:
2pm CST Feb 15, 2026-6pm CST Feb 21, 2026
 
Forecast Discussion
 
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Additional Resources

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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