Harmon, IL Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Harmon, IL in one place.
Sunny, with a high near 76. South southwest wind around 5 mph, with gusts as high as 15 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: Apr 20, 2026 1:10 PM CDT.
The active forecast window currently covers Apr 22 to Apr 26, 2026 for Harmon, IL.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 22 to Apr 26, 2026
- Latest sync
- Apr 20, 2026 1:10 PM CDT
- Forecast office
- LOT
- Source
- NOAA / NWS
Daily Outlook
This Week in Harmon
Thursday looks like the warmest upcoming period in Harmon at 80 degrees F.
Saturday Night is the coolest period ahead with temperatures near 44 degrees F.
The strongest winds are forecast for Thursday at about 10 to 20 mph S.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 20, 2026 1:10 PM CDT
- Coverage
- 5 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
Partly cloudy, with a low around 57.
Mostly sunny, with a high near 80.
Showers and thunderstorms after 7pm. Mostly cloudy, with a low around 59.
Showers and thunderstorms. Mostly cloudy, with a high near 69.
A chance of rain showers. Mostly cloudy, with a low around 46.
A slight chance of rain showers before 7am. Mostly sunny, with a high near 66.
A slight chance of rain showers after 7pm. Partly cloudy, with a low around 44.
A slight chance of rain showers. Mostly sunny, with a high near 64.
A chance of rain showers. Mostly cloudy, with a low around 46.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Wednesday
Apr 22
|
Sunny
|
76°F |
5 mph
SSW
|
|
Wednesday Night
Apr 22
|
Partly Cloudy
|
57°F |
5 to 10 mph
SSE
|
|
Thursday
Apr 23
|
Mostly Sunny
|
80°F |
10 to 20 mph
S
|
|
Thursday Night
Apr 23
|
Showers And Thunderstorms
|
59°F |
15 to 20 mph
S
|
|
Friday
Apr 24
|
Showers And Thunderstorms
|
69°F |
15 mph
WSW
|
|
Friday Night
Apr 24
|
Chance Rain Showers
|
46°F |
10 mph
NW
|
|
Saturday
Apr 25
|
Slight Chance Rain Showers then Mostly Sunny
|
66°F |
10 mph
N
|
|
Saturday Night
Apr 25
|
Slight Chance Rain Showers
|
44°F |
5 to 10 mph
NNE
|
|
Sunday
Apr 26
|
Slight Chance Rain Showers
|
64°F |
5 to 10 mph
NNE
|
|
Sunday Night
Apr 26
|
Chance Rain Showers
|
46°F |
5 to 10 mph
NE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Harmon.