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

Hazardous Weather Conditions

Current conditions at

Tri-Township Airport (KSFY)

Lat: 42.05°NLon: 90.11°WElev: 614ft.

Fair

49°F

9°C

Humidity 87%
Wind Speed Calm
Barometer 29.76 in
Dewpoint 46°F (8°C)
Visibility 10.00 mi
Last update 26 Mar 2:15 am CDT
Extended Forecast for

Lanark IL

  • Overnight

    Overnight: Mostly clear, with a low around 48. Southeast wind around 5 mph.

    Low: 48 °F

    Mostly Clear

  • Thursday

    Thursday: A 50 percent chance of rain, mainly after 4pm. Increasing clouds, with a high near 69. Breezy, with an east wind 5 to 10 mph becoming northeast 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.

    High: 69 °F

    Mostly Sunny
    then Chance
    Rain and
    Breezy

  • Thursday Night

    Thursday Night: A 40 percent chance of rain between 9pm and 11pm. Mostly cloudy, with a low around 27. Blustery, with a northeast wind 15 to 20 mph, with gusts as high as 35 mph.

    Low: 27 °F

    Blustery.
    Chance Rain
    then Partly
    Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 46. North wind 10 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph.

    High: 46 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Clear, with a low around 23.

    Low: 23 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 50.

    High: 50 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 62.

    High: 62 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 47.

    Low: 47 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 48. Southeast wind around 5 mph.
Thursday
A 50 percent chance of rain, mainly after 4pm. Increasing clouds, with a high near 69. Breezy, with an east wind 5 to 10 mph becoming northeast 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph.
Thursday Night
A 40 percent chance of rain between 9pm and 11pm. Mostly cloudy, with a low around 27. Blustery, with a northeast wind 15 to 20 mph, with gusts as high as 35 mph.
Friday
Mostly sunny, with a high near 46. North wind 10 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph.
Friday Night
Clear, with a low around 23.
Saturday
Sunny, with a high near 50.
Saturday Night
Mostly cloudy, with a low around 37.
Sunday
Mostly sunny, with a high near 62.
Sunday Night
Partly cloudy, with a low around 47.
Monday
Mostly sunny, with a high near 73.
Monday Night
Rain and thunderstorms likely. Mostly cloudy, with a low around 47. Chance of precipitation is 60%.
Tuesday
A 50 percent chance of rain. Mostly cloudy, with a high near 66.
Tuesday Night
A 50 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 51.
Wednesday
A 50 percent chance of rain. Mostly cloudy, with a high near 68.
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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:
1:26 am CDT Mar 26, 2026
Forecast Valid:
2am CDT Mar 26, 2026-6pm CDT Apr 1, 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