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

68°F

20°C

Humidity 70%
Wind Speed NE 10 mph
Barometer 30.08 in (1018.3 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 14 Oct 1:56 pm CDT
Extended Forecast for

Harmon IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 67. East northeast wind around 5 mph, with gusts as high as 15 mph.

    High: 67 °F

    Mostly Cloudy

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly between 2am and 5am. Mostly cloudy, with a low around 55. East northeast wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 55 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: Showers, with thunderstorms also possible after 4pm. High near 61. East wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 61 °F

    Showers

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm before midnight, then showers likely between midnight and 1am. Low around 46. Breezy, with a north wind 10 to 15 mph becoming northwest 15 to 20 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 80%.

    Low: 46 °F

    Showers and
    Breezy

  • Friday

    Friday: A 40 percent chance of showers. Partly sunny, with a high near 55. Breezy, with a northwest wind around 20 mph, with gusts as high as 30 mph.

    High: 55 °F

    Chance
    Showers and
    Breezy

  • Friday Night

    Friday Night: Widespread frost, mainly after 5am. Otherwise, mostly clear, with a low around 34.

    Low: 34 °F

    Partly Cloudy
    then Frost

  • Saturday

    Saturday: Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 58.

    High: 58 °F

    Frost then
    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 37.

    Low: 37 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 67. East northeast wind around 5 mph, with gusts as high as 15 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly between 2am and 5am. Mostly cloudy, with a low around 55. East northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Thursday
Showers, with thunderstorms also possible after 4pm. High near 61. East wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Thursday Night
Showers and possibly a thunderstorm before midnight, then showers likely between midnight and 1am. Low around 46. Breezy, with a north wind 10 to 15 mph becoming northwest 15 to 20 mph after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 80%.
Friday
A 40 percent chance of showers. Partly sunny, with a high near 55. Breezy, with a northwest wind around 20 mph, with gusts as high as 30 mph.
Friday Night
Widespread frost, mainly after 5am. Otherwise, mostly clear, with a low around 34.
Saturday
Widespread frost, mainly before 8am. Otherwise, sunny, with a high near 58.
Saturday Night
Clear, with a low around 37.
Sunday
Sunny, with a high near 66.
Sunday Night
Mostly clear, with a low around 41.
Monday
Mostly sunny, with a high near 68.
Monday Night
Partly cloudy, with a low around 44.
Tuesday
Sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Harmon IL
 41.73°N 89.56°W
Last Update:
1:26 pm CDT Oct 14, 2026
Forecast Valid:
2pm CDT Oct 14, 2026-6pm CDT Oct 20, 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