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Harmon, IL Weather

Today: Sunny, high 76°F, low 50°F. Hourly and 7-day forecast from the National Weather Service. Times are local (CDT).

Harmon, IL current weather

54°F

Mostly Clear

Forecast for this hour. No recent report from a nearby station.

H 76° / L 50°

  • No rain expected in the next 12 hours

No recent station report. NWS hourly forecast updated 10/27/2026, 9:35 PM PT

Hourly forecast

NWS, updated 10/27/2026, 9:35 PM PT

  1. Now54°
  2. 2 AM53°
  3. 3 AM52°
  4. 4 AM52°
  5. 5 AM51°
  6. 6 AM50°
  7. 7 AM50°
  8. 8 AM52°
  9. 9 AM56°
  10. 10 AM61°
  11. 11 AM66°
  12. 12 PM70°
  13. 1 PM73°
  14. 2 PM75°
  15. 3 PM76°
  16. 4 PM76°
  17. 5 PM75°
  18. 6 PM72°
  19. 7 PM68°
  20. 8 PM67°
  21. 9 PM66°
  22. 10 PM65°
  23. 11 PM64°
  24. Thu12 AM64°
  25. 1 AM63°42%
  26. 2 AM63°42%
  27. 3 AM63°42%
  28. 4 AM62°42%
  29. 5 AM61°42%
  30. 6 AM61°42%
  31. 7 AM60°13%
  32. 8 AM61°13%
  33. 9 AM62°13%
  34. 10 AM64°13%
  35. 11 AM66°13%
  36. 12 PM66°13%
  37. 1 PM67°
  38. 2 PM68°
  39. 3 PM68°
  40. 4 PM68°
  41. 5 PM65°
  42. 6 PM62°
  43. 7 PM59°
  44. 8 PM57°
  45. 9 PM55°
  46. 10 PM53°
  47. 11 PM52°
  48. Fri12 AM51°

7-day forecast

Tap a day for details

  • Today10/28Low 50°High 76°

    Wednesday: Sunny, with a high near 76. South wind 0 to 15 mph, with gusts as high as 25 mph.

    Overnight: Mostly clear, with a low around 50. South wind around 0 mph.

    Sunny
  • Thu10/2942% chance of precipitationLow 47°High 68°

    Thursday: A chance of rain showers before 7am. Mostly sunny, with a high near 68. West northwest wind 5 to 10 mph. Chance of precipitation is 40%.

    Thursday Night: Mostly clear, with a low around 47. North northeast wind 0 to 5 mph.

    Chance Rain Showers then Mostly Sunny
  • Fri10/3051% chance of precipitationLow 50°High 65°

    Friday: A chance of rain showers after 7am. Mostly cloudy, with a high near 65. Chance of precipitation is 30%.

    Friday Night: A chance of rain showers before 7pm, then a chance of showers and thunderstorms. Cloudy, with a low around 50.

    Chance Rain Showers
  • Sat10/3151% chance of precipitationLow 51°High 66°

    Saturday: A chance of showers and thunderstorms. Cloudy, with a high near 66.

    Saturday Night: A chance of rain showers. Mostly cloudy, with a low around 51.

    Chance Showers And Thunderstorms
  • Sun11/141% chance of precipitationLow 52°High 66°

    Sunday: A chance of rain showers. Mostly cloudy, with a high near 66.

    Sunday Night: A chance of rain showers after midnight. Mostly cloudy, with a low around 52.

    Chance Rain Showers
  • Mon11/256% chance of precipitationLow 50°High 68°

    Monday: A chance of rain showers. Mostly cloudy, with a high near 68.

    Monday Night: Rain showers likely. Mostly cloudy, with a low around 50.

    Chance Rain Showers
  • Tue11/359% chance of precipitationLow High 65°

    Tuesday: Rain showers likely. Mostly cloudy, with a high near 65.

    Rain Showers Likely

Forecast for 41.724, -89.552 from the NWS LOT office, updated 10/27/2026, 9:35 PM PT · Official forecast on weather.gov

Forecaster's discussionIssued 10/28/2026, 12:40 AM CDT

Key messages

- Above average temperatures expected to continue through the upcoming weekend, though tomorrow looks like the warmest day of the bunch.

- While not a wash out, there will be some periodic chances for showers and perhaps isolated thunderstorms at times late Wednesday night through the upcoming weekend.

Discussion

Issued at 1243 PM CDT Tue Oct 27 2026

The rest of the afternoon looks fairly quiet and cloudy as a moisture-starved upper-level waves (currently lifting across the IA/MO border) traverses into the Lower Great Lakes. Suppose a sprinkle or two cannot be ruled out (roughly a 10% chance for rain at any given location).

Wednesday is shaping up to be unseasonably mild area-wide. High temperatures are forecasted to reach the low to mid-70s during the afternoon amidst breezy southwest winds (gusts up to 25 mph, especially with northwestward extent).

The next notable shortwave impulse is expected to track well north across southern Canada Wednesday night. As an associated surface low moves eastward across Ontario, a southwestward- trailing cold front will push southward into our area by Thursday. Although the strongest large-scale forcing will pass well to the north, pooling low-level moisture (dew points in the mid to upper 50s) along the frontal boundary could support isolated to widely scattered showers, particularly late Wednesday night into Thursday. Consequently, we maintain low- end (20 to 40%) chances of precipitation during this period.

Temperatures Thursday and Friday look to be stunted by extensive cloud cover and onshore winds. Have aggressively undercut NBM guidance to now feature highs generally in the mid 60s to around 70 on Thursday to solidly in the 60s on Friday (more more in line with ensemble guidance). Some deterministic guidance suggests highs may struggle to climb out of the 50s on Friday near the Wisconsin state line and Lake Michigan shoreline.

Ensemble guidance suggests a series of impulses will track from Mexico east-northeastward into the Lower Great Lakes region during the weekend, followed by a potentially more substantial system tracking slowly across the central U.S. next week. As a result, there will be daily chances for rain from Saturday into next week. Dry periods are still expected, so it will not be raining continuously throughout the weekend.

KJB/Borchardt

Aviation

Issued at 1240 AM CDT Wed Oct 28 2026

There are no key concerns to highlight for the 06Z TAF period

Light southerly winds through the night will go 10 to 15 kt out of the SSW during the day on Wednesday. SSW to SW will persist through Wednesday night. Expect VFR through the period.

Doom

Watches, warnings and advisories

IL: None. IN: None. LM: None.

From the National Weather Service; may be delayed. Not for life-safety decisions. In an emergency, call 911.

Next 6 hours

NWS hourly forecast

  1. Now54°Mostly Clear2%0 mph
  2. 2 AM53°Mostly Clear2%0 mph
  3. 3 AM52°Mostly Clear2%0 mph
  4. 4 AM52°Clear1%0 mph
  5. 5 AM51°Mostly Clear1%0 mph
  6. 6 AM50°Sunny1%0 mph

Hourly details

Next 7 days: temperature chart, feels like, rain and snow amounts, sky cover, wind and gustsShow
45°63°80°0%100%WedThuFriSatSunMonTue76°50°68°52°65°47°66°51°66°52°68°53°62°51°

Line: temperature °F. Bars: chance of precipitation.

  1. WedNow54°2%0
  2.  2 AM53°2%0
  3.  3 AM52°2%0
  4.  4 AM52°1%0
  5.  5 AM51°1%0
  6.  6 AM50°1%0
  7.  7 AM50°1%0
  8.  8 AM52°1%0
  9.  9 AM56°1%5
  10.  10 AM61°1%10
  11.  11 AM66°1%10
  12.  12 PM70°1%10
  13.  1 PM73°1%15
  14.  2 PM75°1%15
  15.  3 PM76°1%15
  16.  4 PM76°1%15
  17.  5 PM75°1%10
  18.  6 PM72°1%10
  19.  7 PM68°1%10
  20.  8 PM67°1%10
  21.  9 PM66°0%10
  22.  10 PM65°0%10
  23.  11 PM64°1%10
  24. Thu 10/2912 AM64°1%10
  25.  1 AM63°42%10
  26.  2 AM63°42%10
  27.  3 AM63°42%10
  28.  4 AM62°42%10
  29.  5 AM61°42%10
  30.  6 AM61°42%10
  31.  7 AM60°13%5
  32.  8 AM61°13%5
  33.  9 AM62°13%10
  34.  10 AM64°13%10
  35.  11 AM66°13%10
  36.  12 PM66°13%10
  37.  1 PM67°2%10
  38.  2 PM68°2%10
  39.  3 PM68°2%10
  40.  4 PM68°2%10
  41.  5 PM65°2%5
  42.  6 PM62°2%5
  43.  7 PM59°0%5
  44.  8 PM57°0%5
  45.  9 PM55°0%0
  46.  10 PM53°0%0
  47.  11 PM52°0%0
  48. Fri 10/3012 AM51°0%0
  49.  1 AM50°3%0
  50.  2 AM49°3%0
  51.  3 AM49°3%5
  52.  4 AM48°3%5
  53.  5 AM47°3%5
  54.  6 AM47°3%5
  55.  7 AM47°27%5
  56.  8 AM49°27%5
  57.  9 AM52°27%5
  58.  10 AM55°27%5
  59.  11 AM58°27%5
  60.  12 PM60°27%5
  61.  1 PM61°33%5
  62.  2 PM62°33%5
  63.  3 PM63°33%5
  64.  4 PM63°33%5
  65.  5 PM62°33%5
  66.  6 PM61°33%5
  67.  7 PM65°51%5
  68.  8 PM62°51%5
  69.  9 PM60°51%5
  70.  10 PM58°51%5
  71.  11 PM57°51%5
  72. Sat 10/3112 AM56°51%5
  73.  1 AM55°51%5
  74.  2 AM54°51%5
  75.  3 AM53°51%5
  76.  4 AM52°51%5
  77.  5 AM51°51%5
  78.  6 AM51°51%5
  79.  7 AM51°42%5
  80.  8 AM52°42%5
  81.  9 AM54°42%5
  82.  10 AM57°42%5
  83.  11 AM60°42%5
  84.  12 PM62°42%5
  85.  1 PM64°24%5
  86.  2 PM65°24%5
  87.  3 PM66°24%5
  88.  4 PM65°24%5
  89.  5 PM64°24%5
  90.  6 PM62°24%5
  91.  7 PM60°23%5
  92.  8 PM58°23%5
  93.  9 PM56°23%5
  94.  10 PM55°23%5
  95.  11 PM54°23%5
  96. Sun 11/112 AM54°23%5
  97.  1 AM53°29%5
  98.  1 AM53°29%5
  99.  2 AM53°29%5
  100.  3 AM53°29%5
  101.  4 AM52°29%5
  102.  5 AM52°29%5
  103.  6 AM52°41%5
  104.  7 AM54°41%5
  105.  8 AM56°41%5
  106.  9 AM59°41%5
  107.  10 AM61°41%5
  108.  11 AM64°41%5
  109.  12 PM65°27%5
  110.  1 PM66°27%5
  111.  2 PM66°27%5
  112.  3 PM66°27%5
  113.  4 PM65°27%5
  114.  5 PM63°27%5
  115.  6 PM61°13%5
  116.  7 PM59°13%5
  117.  8 PM58°13%5
  118.  9 PM56°13%5
  119.  10 PM55°13%0
  120.  11 PM54°13%0
  121. Mon 11/212 AM54°26%0
  122.  1 AM54°26%0
  123.  2 AM54°26%0
  124.  3 AM54°26%0
  125.  4 AM54°26%0
  126.  5 AM53°26%0
  127.  6 AM53°34%5
  128.  7 AM55°34%5
  129.  8 AM57°34%5
  130.  9 AM60°34%5
  131.  10 AM62°34%5
  132.  11 AM64°34%5
  133.  12 PM66°50%10
  134.  1 PM67°50%10
  135.  2 PM68°50%10
  136.  3 PM67°50%10
  137.  4 PM66°50%10
  138.  5 PM65°50%10
  139.  6 PM63°48%10
  140.  7 PM60°48%10
  141.  8 PM58°48%10
  142.  9 PM56°48%10
  143.  10 PM55°48%10
  144.  11 PM55°48%10
  145. Tue 11/312 AM55°56%10
  146.  1 AM54°56%10
  147.  2 AM54°56%10
  148.  3 AM53°56%15
  149.  4 AM52°56%15
  150.  5 AM51°56%15
  151.  6 AM51°59%15
  152.  7 AM53°59%15
  153.  8 AM55°59%15
  154.  9 AM58°59%15
  155.  10 AM60°59%15
  156.  11 AM62°59%15

Temperature °F · chance of precipitation · wind in mph

NWS hourly forecast updated 10/27/2026, 9:35 PM PT

Radar and satellite

National radar

NEXRAD (last 50 min) and GOES

Latest

Nearby hazards

Illinois hazards

Severe storm and flash flood outlooks, expected rain, river flooding and wildfires near this area

  • Severe storm outlook today:General thunderstormsOutlook map
  • Excessive rainfall outlook (flash flood risk):Could not check the Weather Prediction Center outlook right now.
  • River gauges within 40 miles at or above flood stage: None reported
  • Active wildfires within 50 miles: None reported

Drought

By county

Lee County, week of 10/20/2026

No drought or abnormal dryness in this county.

Sun and moon

Local time, center of the area

Sunrise
7:25 AM
Sunset
5:57 PM
Daylight
10 hr 32 min
Moon
Waning Gibbous 95% lit
First light (civil dawn)
6:57 AM
Last light (civil dusk)
6:26 PM
Moonrise
7:19 PM
Moonset
10:34 AM

Normal October weather

Climate

Normal October high 63°, low 42°, precipitation 2.96 in for the month. 1991 to 2020 normals at Dixon 1w, 8 mi away.

Other places nearby

Data sources

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Frequently asked questions

What is the high temperature today in Harmon, IL?
The National Weather Service forecast for wednesday calls for a high near 76°F. Sunny.
Will it rain in Harmon, IL in the next 24 hours?
The NWS hourly forecast does not show any hour with a 50% or higher chance of precipitation in the next 24 hours.
What time is sunrise and sunset in Harmon, IL today?
Sunrise is about 7:25 AM CDT and sunset is about 5:57 PM CDT (calculated for the center of the area, within a few minutes).
What is the normal October weather in Harmon, IL?
At Dixon 1w, the 1991 to 2020 normal high in October is 63°F and the normal low is 42°F.

About this data

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