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.

Overcast

57°F

14°C

Humidity 93%
Wind Speed W 15 G 26 mph
Barometer 29.88 in (1011.6 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 15 Oct 9:56 pm CDT
Extended Forecast for

Harmon IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 45. Breezy, with a west northwest wind around 20 mph, with gusts as high as 30 mph.

    Low: 45 °F

    Mostly Cloudy
    and Breezy

  • Friday

    Friday: A slight chance of showers before noon, then a chance of showers after 1pm. Mostly cloudy, with a high near 53. Breezy, with a west northwest wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 40%.

    High: 53 °F

    Chance
    Showers and
    Breezy

  • Friday Night

    Friday Night: Widespread frost, mainly after 5am. Otherwise, mostly clear, with a low around 32. North wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 25 mph.

    Low: 32 °F

    Mostly Clear
    then Frost

  • Saturday

    Saturday: Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 57. Calm wind becoming southwest around 5 mph in the afternoon. Winds could gust as high as 10 mph.

    High: 57 °F

    Frost then
    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 37. South wind around 5 mph, with gusts as high as 15 mph.

    Low: 37 °F

    Clear

  • Sunday

    Sunday: Patchy frost before 7am. Otherwise, sunny, with a high near 65.

    High: 65 °F

    Patchy Frost
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 40.

    Low: 40 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 69.

    High: 69 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 45. Breezy, with a west northwest wind around 20 mph, with gusts as high as 30 mph.
Friday
A slight chance of showers before noon, then a chance of showers after 1pm. Mostly cloudy, with a high near 53. Breezy, with a west northwest wind 15 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 40%.
Friday Night
Widespread frost, mainly after 5am. Otherwise, mostly clear, with a low around 32. North wind 10 to 15 mph decreasing to 5 to 10 mph after midnight. Winds could gust as high as 25 mph.
Saturday
Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 57. Calm wind becoming southwest around 5 mph in the afternoon. Winds could gust as high as 10 mph.
Saturday Night
Clear, with a low around 37. South wind around 5 mph, with gusts as high as 15 mph.
Sunday
Patchy frost before 7am. Otherwise, sunny, with a high near 65.
Sunday Night
Mostly clear, with a low around 40.
Monday
Mostly sunny, with a high near 69.
Monday Night
Partly cloudy, with a low around 42.
Tuesday
Mostly sunny, with a high near 72.
Tuesday Night
Mostly clear, with a low around 45.
Wednesday
Mostly sunny, with a high near 73.
Wednesday Night
Mostly clear, with a low around 50.
Thursday
Mostly sunny, with a high near 74.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Harmon IL
 41.73°N 89.56°W
Last Update:
10:01 pm CDT Oct 15, 2026
Forecast Valid:
10pm CDT Oct 15, 2026-6pm CDT Oct 22, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation