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Union, Illinois Weather Forecast
Union, Illinois Weather
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Weather Forecast for Union, Illinois : Will County
Issued: 7:55 pm CST Nov 18, 2025 Latitude: 41.4969757 Longitude: -88.0233891 View on Google Maps

MouseOver for Detail Forecast
Tonight Wednesday Thursday Friday Saturday Sunday Monday Tuesday
Cloudy on Tonight Cloudy on Wednesday 20% chance of rain on Thursday 20% chance of rain on Friday Mostly Sunny on Saturday Sunny on Sunday Mostly Sunny on Monday 20% chance of rain on Tuesday
Low: 40°F High: 45°F High: 56°F High: 52°F High: 51°F High: 55°F High: 55°F High: 50°F
Low: 39°F Low: 38°F Low: 34°F Low: 35°F Low: 38°F Low: 36°F  
Cloudy Cloudy Rain Rain Mostly Sunny Sunny Mostly Sunny Rain
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Current Conditions at
JOLIET - (KJOT)
45°
Cloudy
as of 7:35 PM CST
Rel. Humidity: 93%
Dew Point: 43°F
Visibility: 7 Miles
Pressure: 30.06 in.
Flight Rule: MVFR
Wind Data
8 MPH
080° East
Cloud Level(s): Solid Overcast at 1000ft
Current Conditions at
ROMEOVILLE WFO - (KLOT)
43°
Feels like 36°F
Cloudy
Mist
as of 6:45 PM CST
Rel. Humidity: 100%
Dew Point: 43°F
Visibility: 6 Miles
Pressure: 30.04 in.
Flight Rule: IFR
Wind Data
12 MPH
050° Northeast
Cloud Level(s): Solid Overcast at 800ft
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
43°
Cloudy
Mist
as of 7:35 PM CST
Rel. Humidity: 100%
Dew Point: 43°F
Visibility: 5 Miles
Pressure: 30.06 in.
Flight Rule: IFR
Wind Data
Calm
Cloud Level(s): Solid Overcast at 800ft
Current Conditions at
CHICAGO-MIDWAY - (KMDW)
43°
Feels like 36°F
Cloudy
Mist
as of 6:53 PM CST
Rel. Humidity: 86%
Dew Point: 39°F
Visibility: 6 Miles
Pressure: 30.04 in.
Flight Rule: IFR
Wind Data
13 MPH
060° Northeast
Cloud Level(s): Solid Overcast at 800ft
Cloudy on Tonight Tonight... Patchy drizzle before 9pm. Cloudy, with a low around 40. East northeast wind around 5 mph.

Cloudy on Wednesday Wednesday... Cloudy, with a high near 45. East southeast wind around 5 mph.

Cloudy on Wednesday Night Wednesday Night... Cloudy, with a low around 39. East southeast wind around 5 mph becoming calm.

20% chance of rain Thursday Thursday... A 20 percent chance of rain after noon. Cloudy, with a high near 56. Light south wind increasing to 5 to 10 mph in the morning.

20% chance of rain Thursday Night Thursday Night... A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 38. South southwest wind around 5 mph becoming north after midnight.

20% chance of rain Friday Friday... A 20 percent chance of rain after noon. Partly sunny, with a high near 52.

20% chance of rain Friday Night Friday Night... A 20 percent chance of rain. Mostly cloudy, with a low around 34.

Mostly Sunny on Saturday Saturday... Mostly sunny, with a high near 51.

Mostly Clear on Saturday Night Saturday Night... Mostly clear, with a low around 35.

Sunny on Sunday Sunday... Sunny, with a high near 55.

Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 38.

Mostly Sunny on Monday Monday... Mostly sunny, with a high near 55.

20% chance of rain Monday Night Monday Night... A chance of rain. Mostly cloudy, with a low around 36.

20% chance of rain Tuesday Tuesday... A chance of rain. Mostly cloudy, with a high near 50.

Current Radar Image


Sun Almanac for Union, Illinois
Sunrise: 06:45 AM
Sunset: 4:30 PM
Civil Sunrise:06:15 AM
Civil Sunset: 5:00 PM
Nautical Sunrise: 05:41 AM
Nautical Sunset: 5:33 PM
Astro Sunrise: 05:08 AM
Astro Sunset: 6:06 PM
Any use of the information on this page is at your own risk. This information should not be relied upon in life-threatening situations, potential financial loss situations or in lieu of any officially disseminated information. Visit the National Weather Service for official information.