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

86°F

30°C

Humidity 67%
Wind Speed W 6 mph
Barometer 29.88 in (1011.2 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index94°F (34°C)
Last update 10 Jul 3:54 pm CDT
Extended Forecast for

Rockbridge IL

  • This Afternoon

    This Afternoon: Isolated showers and thunderstorms. Mostly sunny, with a high near 88. Calm wind. Chance of precipitation is 20%.

    High: 88 °F

    Isolated
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly between 3am and 4am. Increasing clouds, with a low around 68. Calm wind. Chance of precipitation is 60%.

    Low: 68 °F

    T-storms
    Likely

  • Saturday

    Saturday: Showers and thunderstorms likely, mainly between 1pm and 3pm. Mostly cloudy, with a high near 84. Calm wind becoming northeast around 5 mph in the afternoon. Chance of precipitation is 60%.

    High: 84 °F

    T-storms
    Likely

  • Saturday Night

    Saturday Night: Scattered showers and thunderstorms, mainly before 7pm. Mostly cloudy, with a low around 65. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 65 °F

    Scattered
    T-storms

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms, mainly between 7am and 4pm. Mostly sunny, with a high near 84. Northeast wind 5 to 10 mph.

    High: 84 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

Detailed Forecast

This Afternoon
Isolated showers and thunderstorms. Mostly sunny, with a high near 88. Calm wind. Chance of precipitation is 20%.
Tonight
Showers and thunderstorms likely, mainly between 3am and 4am. Increasing clouds, with a low around 68. Calm wind. Chance of precipitation is 60%.
Saturday
Showers and thunderstorms likely, mainly between 1pm and 3pm. Mostly cloudy, with a high near 84. Calm wind becoming northeast around 5 mph in the afternoon. Chance of precipitation is 60%.
Saturday Night
Scattered showers and thunderstorms, mainly before 7pm. Mostly cloudy, with a low around 65. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Sunday
A 40 percent chance of showers and thunderstorms, mainly between 7am and 4pm. Mostly sunny, with a high near 84. Northeast wind 5 to 10 mph.
Sunday Night
Mostly clear, with a low around 64.
Monday
Sunny, with a high near 86.
Monday Night
Mostly clear, with a low around 66.
Tuesday
Sunny, with a high near 88.
Tuesday Night
Mostly clear, with a low around 67.
Wednesday
Sunny, with a high near 90.
Wednesday Night
Mostly clear, with a low around 69.
Thursday
Sunny, with a high near 90.
Thursday Night
Mostly clear, with a low around 69.
Friday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 89.
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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:
2:52 pm CDT Jul 10, 2026
Forecast Valid:
4pm CDT Jul 10, 2026-6pm CDT Jul 17, 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