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

80°F

27°C

Humidity 49%
Wind Speed N 7 mph
Barometer 30.00 in (1015.3 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 19 Jun 6:54 pm CDT
Extended Forecast for

Rockbridge IL

  • Tonight

    Tonight: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 61. Calm wind.

    Low: 61 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 84. Light north wind.

    High: 84 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of showers before 4am, then a chance of showers and thunderstorms between 4am and 5am, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 63. Calm wind becoming east around 6 mph after midnight. Chance of precipitation is 60%.

    Low: 63 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm, then showers and thunderstorms after 7am. High near 78. Southeast wind 7 to 15 mph becoming south in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 100%.

    High: 78 °F

    T-storms

  • Sunday Night

    Sunday Night: Showers and thunderstorms, mainly before 1am. Low around 61. West wind 8 to 11 mph becoming northwest after midnight. Chance of precipitation is 80%.

    Low: 61 °F

    T-storms

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 75.

    High: 75 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

Detailed Forecast

Tonight
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 61. Calm wind.
Saturday
Mostly sunny, with a high near 84. Light north wind.
Saturday Night
A chance of showers before 4am, then a chance of showers and thunderstorms between 4am and 5am, then showers likely and possibly a thunderstorm after 5am. Increasing clouds, with a low around 63. Calm wind becoming east around 6 mph after midnight. Chance of precipitation is 60%.
Sunday
Showers likely and possibly a thunderstorm, then showers and thunderstorms after 7am. High near 78. Southeast wind 7 to 15 mph becoming south in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 100%.
Sunday Night
Showers and thunderstorms, mainly before 1am. Low around 61. West wind 8 to 11 mph becoming northwest after midnight. Chance of precipitation is 80%.
Monday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 75.
Monday Night
Partly cloudy, with a low around 56.
Tuesday
Mostly sunny, with a high near 78.
Tuesday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 58.
Wednesday
Sunny, with a high near 80.
Wednesday Night
Mostly clear, with a low around 57.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 79.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 58.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 81.
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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:
6:01 pm CDT Jun 19, 2026
Forecast Valid:
7pm CDT Jun 19, 2026-6pm CDT Jun 26, 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