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

54°F

12°C

Humidity 39%
Wind Speed N 5 mph
Barometer 29.91 in
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill53°F (12°C)
Last update 9 May 11:35 pm CDT
Extended Forecast for

Lanark IL

  • Tonight

    Tonight: Mostly clear, with a low around 41. North wind 5 to 10 mph.

    Low: 41 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 63. Northwest wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 63 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, then becoming clear toward daybreak, with a low around 39. Northwest wind 5 to 10 mph becoming light and variable in the evening.

    Low: 39 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 64. Northeast wind around 5 mph becoming north in the afternoon.

    High: 64 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 43.

    Low: 43 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Showers likely and possibly a thunderstorm before 10am, then showers likely between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 76. Breezy. Chance of precipitation is 70%.

    High: 76 °F

    Showers
    Likely and
    Breezy

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 49.

    Low: 49 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 65. Breezy.

    High: 65 °F

    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 41. North wind 5 to 10 mph.
Sunday
Sunny, with a high near 63. Northwest wind 5 to 15 mph, with gusts as high as 20 mph.
Sunday Night
Mostly cloudy, then becoming clear toward daybreak, with a low around 39. Northwest wind 5 to 10 mph becoming light and variable in the evening.
Monday
Sunny, with a high near 64. Northeast wind around 5 mph becoming north in the afternoon.
Monday Night
Partly cloudy, with a low around 43.
Tuesday
Showers likely and possibly a thunderstorm before 10am, then showers likely between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 76. Breezy. Chance of precipitation is 70%.
Tuesday Night
Mostly clear, with a low around 49.
Wednesday
Sunny, with a high near 65. Breezy.
Wednesday Night
Mostly clear, with a low around 42.
Thursday
Sunny, with a high near 70.
Thursday Night
A 40 percent chance of showers. Partly cloudy, with a low around 51.
Friday
Partly sunny, with a high near 79.
Friday Night
Partly cloudy, with a low around 56.
Saturday
Mostly sunny, with a high near 86.
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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:
8:32 pm CDT May 9, 2026
Forecast Valid:
11pm CDT May 9, 2026-6pm CDT May 16, 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