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.

Partly Cloudy

80°F

27°C

Humidity 54%
Wind Speed NW 3 mph
Barometer 30.01 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 3 Aug 12:35 pm CDT
Extended Forecast for

Lanark IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 81. Calm wind becoming southeast around 5 mph.

    High: 81 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 61. Calm wind becoming southeast around 5 mph after midnight.

    Low: 61 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 84. South wind 5 to 10 mph.

    High: 84 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. Southwest wind around 5 mph becoming calm. Chance of precipitation is 60%.

    Low: 64 °F

    Chance
    Showers then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers, with thunderstorms also possible after 1pm. High near 77. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 77 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 59. Chance of precipitation is 70%. New precipitation amounts between 1 and 2 inches possible.

    Low: 59 °F

    Heavy Rain

  • Thursday

    Thursday: Partly sunny, with a high near 78.

    High: 78 °F

    Partly Sunny

  • Thursday Night

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

    Low: 58 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 81. Calm wind becoming southeast around 5 mph.
Tonight
Mostly clear, with a low around 61. Calm wind becoming southeast around 5 mph after midnight.
Tuesday
Mostly sunny, with a high near 84. South wind 5 to 10 mph.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 64. Southwest wind around 5 mph becoming calm. Chance of precipitation is 60%.
Wednesday
Showers, with thunderstorms also possible after 1pm. High near 77. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday Night
Showers likely and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 59. Chance of precipitation is 70%. New precipitation amounts between 1 and 2 inches possible.
Thursday
Partly sunny, with a high near 78.
Thursday Night
Mostly clear, with a low around 58.
Friday
Mostly sunny, with a high near 81.
Friday Night
Mostly clear, with a low around 61.
Saturday
Mostly sunny, with a high near 84.
Saturday Night
Mostly clear, with a low around 65.
Sunday
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:
10:51 am CDT Aug 3, 2026
Forecast Valid:
12pm CDT Aug 3, 2026-6pm CDT Aug 9, 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