Harmon, IL Weather Forecast
Local 7-day forecast
Partly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Harmon, IL in one place.
Partly sunny, with a high near 88. Heat index values as high as 95. West wind 5 to 10 mph.
Local Weather Overview
This forecast page for Harmon, IL is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Jun 8, 2026 5:53 PM CDT.
The active forecast window currently covers Jun 9 to Jun 14, 2026 for Harmon, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jun 9 to Jun 14, 2026
- Latest sync
- Jun 8, 2026 5:53 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Harmon
Wednesday looks like the warmest upcoming period in Harmon at 91 degrees F.
Sunday Night is the coolest period ahead with temperatures near 56 degrees F.
The strongest winds are forecast for Wednesday at about 10 to 20 mph SSW.
Precipitation is mentioned in 9 upcoming forecast periods.
Forecast Details
- Last updated
- Jun 8, 2026 5:53 PM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- LOT
- Radar station
- KDVN
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A slight chance of rain showers between 7pm and midnight, then a chance of showers and thunderstorms. Partly cloudy, with a low around 70. South southwest wind 5 to 10 mph. Chance of precipitation is 30%.
A chance of rain showers before 7am, then a chance of showers and thunderstorms. Mostly sunny, with a high near 91. South southwest wind 10 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 7pm, then showers and thunderstorms between 7pm and 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Chance of precipitation is 80%.
A chance of showers and thunderstorms before 7am, then showers and thunderstorms. Mostly sunny, with a high near 86.
Showers and thunderstorms before 1am. Mostly cloudy, with a low around 59.
Sunny, with a high near 84.
Mostly clear, with a low around 61.
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 87.
A chance of showers and thunderstorms. Partly cloudy, with a low around 59.
A chance of showers and thunderstorms. Mostly sunny, with a high near 80.
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 56.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Jun 9
|
Partly Sunny
|
88°F |
5 to 10 mph
W
|
|
Tuesday Night
Jun 9
|
Chance Showers And Thunderstorms
|
70°F |
5 to 10 mph
SSW
|
|
Wednesday
Jun 10
|
Chance Rain Showers then Chance Showers And Thunderstorms
|
91°F |
10 to 20 mph
SSW
|
|
Wednesday Night
Jun 10
|
Chance Showers And Thunderstorms then Showers And Thunderstorms
|
68°F |
10 to 20 mph
SW
|
|
Thursday
Jun 11
|
Chance Showers And Thunderstorms then Showers And Thunderstorms
|
86°F |
10 to 20 mph
SSW
|
|
Thursday Night
Jun 11
|
Showers And Thunderstorms
|
59°F |
5 to 15 mph
WSW
|
|
Friday
Jun 12
|
Sunny
|
84°F |
5 to 15 mph
W
|
|
Friday Night
Jun 12
|
Mostly Clear
|
61°F |
5 to 10 mph
WSW
|
|
Saturday
Jun 13
|
Sunny then Slight Chance Showers And Thunderstorms
|
87°F |
5 to 15 mph
WSW
|
|
Saturday Night
Jun 13
|
Chance Showers And Thunderstorms
|
59°F |
5 to 10 mph
NW
|
|
Sunday
Jun 14
|
Chance Showers And Thunderstorms
|
80°F |
5 to 10 mph
NNW
|
|
Sunday Night
Jun 14
|
Slight Chance Showers And Thunderstorms
|
56°F |
5 to 10 mph
NE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Harmon.