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.

Mostly Cloudy

75°F

24°C

Humidity 66%
Wind Speed Calm
Barometer 30.02 in (1016.0 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 20 Jun 7:54 am CDT
Extended Forecast for

2 Miles N Rockbridge IL

Flood Watch June 21, 07:00am until June 22, 01:00am
Click here for hazard details and duration
Flood Watch

  • Today

    Today: Mostly sunny, with a high near 82. Northwest wind 3 to 5 mph.

    High: 82 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 63. Light and variable wind becoming east around 6 mph in the evening.

    Low: 63 °F

    Mostly Cloudy

  • Sunday

    Sunday: Showers and thunderstorms, mainly after 9am. Some of the storms could produce heavy rainfall. High near 79. East wind 8 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 100%.

    High: 79 °F

    Heavy Rain

  • Sunday Night

    Sunday Night: Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 59. Southwest wind 8 to 10 mph becoming north after midnight. Chance of precipitation is 70%.

    Low: 59 °F

    T-storms
    Likely

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 75. North wind around 10 mph.

    High: 75 °F

    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 58.

    Low: 58 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 82. Northwest wind 3 to 5 mph.
Tonight
Mostly cloudy, with a low around 63. Light and variable wind becoming east around 6 mph in the evening.
Sunday
Showers and thunderstorms, mainly after 9am. Some of the storms could produce heavy rainfall. High near 79. East wind 8 to 15 mph becoming southwest in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 100%.
Sunday Night
Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 59. Southwest wind 8 to 10 mph becoming north after midnight. Chance of precipitation is 70%.
Monday
A 20 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 75. North wind around 10 mph.
Monday Night
Mostly clear, with a low around 56.
Tuesday
Sunny, with a high near 79.
Tuesday Night
Mostly clear, with a low around 58.
Wednesday
Sunny, with a high near 81.
Wednesday Night
Mostly clear, with a low around 58.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 79.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 58.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles N Rockbridge IL
 39.31°N 90.2°W (Elev. 535 ft)
Last Update:
5:36 am CDT Jun 20, 2026
Forecast Valid:
8am CDT Jun 20, 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