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

Hazardous Weather Conditions

Current conditions at

Sterling Rockfalls (KSQI)

Lat: 41.74°NLon: 89.67°WElev: 643ft.

Fair

49°F

9°C

Humidity 97%
Wind Speed SE 3 mph
Barometer 30.04 in (1017.4 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 5 Mar 8:56 pm CST
Extended Forecast for

Harmon IL

  • Tonight

    Tonight: A slight chance of showers and thunderstorms between 4am and 5am, then showers likely and possibly a thunderstorm after 5am. Areas of fog. Otherwise, mostly cloudy, with a low around 44. Southeast wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 44 °F

    Areas Fog
    then Showers
    Likely and
    Areas Fog

  • Friday

    Friday: Showers and possibly a thunderstorm, mainly before 3pm, then a chance of showers and thunderstorms after 3pm. Areas of fog before noon. High near 71. Southeast wind 10 to 15 mph becoming south southwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 71 °F

    Showers and
    Areas Fog
    then Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Low around 54. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 54 °F

    Breezy.
    Chance
    T-storms then
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers before 9am. Mostly cloudy, with a high near 57. Breezy, with a west wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 57 °F

    Breezy.
    Slight Chance
    Showers then
    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 33. West northwest wind 5 to 10 mph becoming southwest after midnight. Winds could gust as high as 15 mph.

    Low: 33 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 46.

    Low: 46 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 72.

    High: 72 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 49.

    Low: 49 °F

    Mostly Clear

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms between 4am and 5am, then showers likely and possibly a thunderstorm after 5am. Areas of fog. Otherwise, mostly cloudy, with a low around 44. Southeast wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Showers and possibly a thunderstorm, mainly before 3pm, then a chance of showers and thunderstorms after 3pm. Areas of fog before noon. High near 71. Southeast wind 10 to 15 mph becoming south southwest in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Friday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after midnight. Low around 54. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Saturday
A 20 percent chance of showers before 9am. Mostly cloudy, with a high near 57. Breezy, with a west wind 10 to 20 mph, with gusts as high as 30 mph.
Saturday Night
Partly cloudy, with a low around 33. West northwest wind 5 to 10 mph becoming southwest after midnight. Winds could gust as high as 15 mph.
Sunday
Sunny, with a high near 62.
Sunday Night
Clear, with a low around 46.
Monday
Sunny, with a high near 72.
Monday Night
Mostly clear, with a low around 49.
Tuesday
Showers likely, mainly after noon. Partly sunny, with a high near 74.
Tuesday Night
Showers. Mostly cloudy, with a low around 43.
Wednesday
A chance of showers. Mostly cloudy, with a high near 55.
Wednesday Night
Partly cloudy, with a low around 27.
Thursday
Mostly sunny, with a high near 49.
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ABOUT THIS FORECAST

 
Point Forecast:
Harmon IL
 41.73°N 89.56°W
Last Update:
3:06 pm CST Mar 5, 2026
Forecast Valid:
9pm CST Mar 5, 2026-6pm CDT Mar 12, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation