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

Tri-Township Airport (KSFY)

Lat: 42.05°NLon: 90.11°WElev: 614ft.

Fair

67°F

19°C

Humidity 70%
Wind Speed S 5 mph
Barometer 30.01 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 11 Oct 10:35 am CDT
Extended Forecast for

Lanark IL

  • Today

    Today: Sunny, with a high near 82. South wind 5 to 10 mph.

    High: 82 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 63. South wind 5 to 10 mph.

    Low: 63 °F

    Increasing
    Clouds

  • Columbus Day

    Columbus Day: Mostly sunny, with a high near 87. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 87 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 67. South wind around 10 mph.

    Low: 67 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 79.

    High: 79 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers after 1am. Partly cloudy, with a low around 56.

    Low: 56 °F

    Mostly Clear
    then Chance
    Showers

  • Wednesday

    Wednesday: A 30 percent chance of showers before 1pm. Partly sunny, with a high near 70.

    High: 70 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 52.

    Low: 52 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: Showers likely. Mostly cloudy, with a high near 67. Chance of precipitation is 70%.

    High: 67 °F

    Showers
    Likely

Detailed Forecast

Today
Sunny, with a high near 82. South wind 5 to 10 mph.
Tonight
Increasing clouds, with a low around 63. South wind 5 to 10 mph.
Columbus Day
Mostly sunny, with a high near 87. Southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 67. South wind around 10 mph.
Tuesday
Sunny, with a high near 79.
Tuesday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 56.
Wednesday
A 30 percent chance of showers before 1pm. Partly sunny, with a high near 70.
Wednesday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 52.
Thursday
Showers likely. Mostly cloudy, with a high near 67. Chance of precipitation is 70%.
Thursday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 46.
Friday
Partly sunny, with a high near 59. Breezy.
Friday Night
Mostly cloudy, with a low around 36. Breezy.
Saturday
Mostly sunny, with a high near 55.
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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:
8:52 am CDT Oct 11, 2026
Forecast Valid:
10am CDT Oct 11, 2026-6pm CDT Oct 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