Harmon, IL Weather Forecast

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Harmon, IL Weather Forecast

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Harmon IL weather  - Mostly Clear - 85°F
Mostly Clear
85°F
Updated 5:12 pm
Feels Like 93°F
Humidity 69%
Wind N 12 mph
Barometer  29.97 in
Dew Point 74°F
Harmon IL weather  - Mostly Clear - 29°C
Mostly Clear
29°C
Updated 5:12 pm
Feels Like 34°C
Humidity 69%
Wind N 19 km/h
Barometer  101.5 kPa
Dew Point 23°C

Harmon Weather Forecast

LATE THIS AFTERNOON TONIGHT SUNDAY SUNDAY NIGHT LABOR DAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT
Harmon, IL Weather - Late This Afternoon Partly Cloudy Harmon, IL Weather - Tonight Partly Cloudy Harmon, IL Weather - Sunday Partly Cloudy Harmon, IL Weather - Sunday Night Partly Cloudy Harmon, IL Weather - Labor Day Partly Cloudy Harmon, IL Weather - Monday Night Partly Cloudy Harmon, IL Weather - Tuesday Partly Cloudy Harmon, IL Weather - Tuesday Night Chance Of T-Storm Harmon, IL Weather - Wednesday Partly Cloudy Harmon, IL Weather - Wednesday Night Partly Cloudy Harmon, IL Weather - Thursday Partly Cloudy Harmon, IL Weather - Thursday Night Clearing
Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Partly Cloudy Chance of T-Storm Partly Cloudy Partly Cloudy Partly Cloudy Clearing
Hi: 85°FHi: 29°C
Lo: 61°FLo: 16°C Hi: 81°FHi: 27°C
Lo: 59°FLo: 15°C Hi: 80°FHi: 27°C
Lo: 61°FLo: 16°C Hi: 89°FHi: 32°C
Lo: 70°FLo: 21°C Hi: 89°FHi: 32°C
Lo: 61°FLo: 16°C Hi: 80°FHi: 27°C
Lo: 59°FLo: 15°C
POP: 20%
POP = Probability of Precipitation.
Weather Outlook Updated: 406 PM CDT Sat Sep 05 2026 Harmon, IL Weather - WeatherWorld.com

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Harmon Forecast Discussion

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Issued: 137 PM CDT Sat Sep 5 2026

Key Messages

  • Moderate to high swim risk expected through early Sunday during the final weekend of beach season.
  • Relatively cooler Sunday and Monday, although remaining seasonably warm.

Discussion

... Issued at 137 PM CDT Sat Sep 5 2026

After an unseasonably hot and humid stretch to start September, cooler conditions are beginning to filter over the area from north to south today. Moisture pooling along a cold front draped across the southern CWA combined with temps in the lower 90s south of the fron...