National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

St. Charles, St. Charles County Smartt Airport (KSET)

Lat: 38.93°NLon: 90.43°WElev: 436ft.

Fair

63°F

17°C

Humidity 27%
Wind Speed S 10 mph
Barometer 30.00 in (1015.6 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Last update 28 Feb 1:54 pm CST
Extended Forecast for

Rockbridge IL

  • This Afternoon

    This Afternoon: A 20 percent chance of rain before 5pm. Mostly sunny, with a high near 62. Southeast wind around 6 mph becoming northeast.

    High: 62 °F

    Slight Chance
    Rain

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 29. North wind 7 to 13 mph, with gusts as high as 22 mph.

    Low: 29 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Partly sunny, with a high near 43. Northeast wind 9 to 13 mph, with gusts as high as 21 mph.

    High: 43 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Snow likely. Cloudy, with a low around 30. East wind around 9 mph. Chance of precipitation is 70%. New snow accumulation of around an inch possible.

    Low: 30 °F

    Snow Likely

  • Monday

    Monday: A chance of rain and snow before 9am, then a chance of rain. Cloudy, with a high near 44. Southeast wind 9 to 11 mph. Chance of precipitation is 40%.

    High: 44 °F

    Chance
    Rain/Snow
    then Slight
    Chance Rain

  • Monday Night

    Monday Night: Rain. Low around 37. Chance of precipitation is 90%.

    Low: 37 °F

    Rain

  • Tuesday

    Tuesday: Rain and possibly a thunderstorm before 9am, then rain between 9am and noon, then rain and possibly a thunderstorm after noon. High near 59. Chance of precipitation is 90%.

    High: 59 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 48. Chance of precipitation is 90%.

    Low: 48 °F

    Rain

  • Wednesday

    Wednesday: Rain and possibly a thunderstorm. High near 64. Chance of precipitation is 80%.

    High: 64 °F

    Rain

Detailed Forecast

This Afternoon
A 20 percent chance of rain before 5pm. Mostly sunny, with a high near 62. Southeast wind around 6 mph becoming northeast.
Tonight
Mostly cloudy, then gradually becoming clear, with a low around 29. North wind 7 to 13 mph, with gusts as high as 22 mph.
Sunday
Partly sunny, with a high near 43. Northeast wind 9 to 13 mph, with gusts as high as 21 mph.
Sunday Night
Snow likely. Cloudy, with a low around 30. East wind around 9 mph. Chance of precipitation is 70%. New snow accumulation of around an inch possible.
Monday
A chance of rain and snow before 9am, then a chance of rain. Cloudy, with a high near 44. Southeast wind 9 to 11 mph. Chance of precipitation is 40%.
Monday Night
Rain. Low around 37. Chance of precipitation is 90%.
Tuesday
Rain and possibly a thunderstorm before 9am, then rain between 9am and noon, then rain and possibly a thunderstorm after noon. High near 59. Chance of precipitation is 90%.
Tuesday Night
Rain and possibly a thunderstorm. Low around 48. Chance of precipitation is 90%.
Wednesday
Rain and possibly a thunderstorm. High near 64. Chance of precipitation is 80%.
Wednesday Night
Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 49. Chance of precipitation is 70%.
Thursday
Rain likely. Partly sunny, with a high near 68. Chance of precipitation is 60%.
Thursday Night
A 50 percent chance of rain and thunderstorms. Partly cloudy, with a low around 52.
Friday
Rain likely and possibly a thunderstorm. Mostly cloudy, with a high near 70. Chance of precipitation is 70%.
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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:
1:16 pm CST Feb 28, 2026
Forecast Valid:
2pm CST Feb 28, 2026-6pm CST Mar 6, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation