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

41°F

5°C

Humidity 86%
Wind Speed SE 5 mph
Barometer 29.84 in (1010.9 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 7 Jan 5:56 pm CST
Extended Forecast for

Lanark IL

  • Tonight

    Tonight: Partly cloudy, with a low around 36. South wind around 10 mph.

    Low: 36 °F

    Partly Cloudy

  • Thursday

    Thursday: Rain, mainly after 1pm. High near 52. South wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 52 °F

    Slight Chance
    Rain then
    Rain

  • Thursday Night

    Thursday Night: Rain, mainly before midnight. Low around 38. Southeast wind 10 to 15 mph becoming northwest after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 90%.

    Low: 38 °F

    Rain then
    Chance Rain

  • Friday

    Friday: A 20 percent chance of rain. Mostly cloudy, with a high near 43. Northwest wind 5 to 10 mph becoming north in the afternoon.

    High: 43 °F

    Slight Chance
    Rain

  • Friday Night

    Friday Night: A chance of rain and snow between midnight and 3am, then a chance of snow after 3am. Mostly cloudy, with a low around 31. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.

    Low: 31 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Saturday

    Saturday: Snow likely, mainly before noon. Mostly cloudy, with a high near 35. Chance of precipitation is 60%. New snow accumulation of around an inch possible.

    High: 35 °F

    Snow Likely

  • Saturday Night

    Saturday Night: A 40 percent chance of snow before midnight. Mostly cloudy, with a low around 18.

    Low: 18 °F

    Chance Snow
    then Mostly
    Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 28.

    High: 28 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 18.

    Low: 18 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 36. South wind around 10 mph.
Thursday
Rain, mainly after 1pm. High near 52. South wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Thursday Night
Rain, mainly before midnight. Low around 38. Southeast wind 10 to 15 mph becoming northwest after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 90%.
Friday
A 20 percent chance of rain. Mostly cloudy, with a high near 43. Northwest wind 5 to 10 mph becoming north in the afternoon.
Friday Night
A chance of rain and snow between midnight and 3am, then a chance of snow after 3am. Mostly cloudy, with a low around 31. Chance of precipitation is 50%. New snow accumulation of less than a half inch possible.
Saturday
Snow likely, mainly before noon. Mostly cloudy, with a high near 35. Chance of precipitation is 60%. New snow accumulation of around an inch possible.
Saturday Night
A 40 percent chance of snow before midnight. Mostly cloudy, with a low around 18.
Sunday
Mostly sunny, with a high near 28.
Sunday Night
Partly cloudy, with a low around 18.
Monday
Partly sunny, with a high near 38.
Monday Night
Mostly cloudy, with a low around 28.
Tuesday
Mostly cloudy, with a high near 39.
Tuesday Night
A chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 30%.
Wednesday
Mostly cloudy, with a high near 34.
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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:
3:16 pm CST Jan 7, 2026
Forecast Valid:
6pm CST Jan 7, 2026-6pm CST Jan 14, 2026
 
Forecast Discussion
 
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Additional Resources

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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