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

Sterling Rockfalls (KSQI)

Lat: 41.74°NLon: 89.67°WElev: 643ft.

Fair

65°F

18°C

Humidity 43%
Wind Speed W 14 mph
Barometer 29.65 in (1003.7 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Last update 15 Nov 3:56 pm CST
Extended Forecast for

Lanark IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 68. Northwest wind around 15 mph, with gusts as high as 25 mph.

    High: 68 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 31. Northwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 31 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 49. Northwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 49 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 27. West wind around 5 mph becoming calm in the evening.

    Low: 27 °F

    Mostly Clear

  • Monday

    Monday: Partly sunny, with a high near 48.

    High: 48 °F

    Partly Sunny

  • Monday Night

    Monday Night: Rain likely. Cloudy, with a low around 36. Chance of precipitation is 70%.

    Low: 36 °F

    Rain Likely

  • Tuesday

    Tuesday: A 40 percent chance of rain before noon. Mostly cloudy, with a high near 46.

    High: 46 °F

    Chance Rain
    then Mostly
    Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 34.

    Low: 34 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 49.

    High: 49 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Sunny, with a high near 68. Northwest wind around 15 mph, with gusts as high as 25 mph.
Tonight
Clear, with a low around 31. Northwest wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday
Sunny, with a high near 49. Northwest wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 27. West wind around 5 mph becoming calm in the evening.
Monday
Partly sunny, with a high near 48.
Monday Night
Rain likely. Cloudy, with a low around 36. Chance of precipitation is 70%.
Tuesday
A 40 percent chance of rain before noon. Mostly cloudy, with a high near 46.
Tuesday Night
Mostly cloudy, with a low around 34.
Wednesday
Mostly cloudy, with a high near 49.
Wednesday Night
Mostly cloudy, with a low around 37.
Thursday
A 50 percent chance of rain. Mostly cloudy, with a high near 54.
Thursday Night
Rain likely. Mostly cloudy, with a low around 40. Chance of precipitation is 60%.
Friday
A 50 percent chance of rain. Mostly cloudy, with a high near 52.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lanark IL
 42.11°N 89.83°W (Elev. 883 ft)
Last Update:
3:31 pm CST Nov 15, 2025
Forecast Valid:
4pm CST Nov 15, 2025-6pm CST Nov 21, 2025
 
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