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Union, Illinois Weather Forecast
Union, Illinois Weather
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Weather Forecast for Union, Illinois : Will County
Issued: 1:05 am CST Nov 20, 2025 Latitude: 41.4969757 Longitude: -88.0233891 View on Google Maps

MouseOver for Detail Forecast
Overnight Thursday Friday Saturday Sunday Monday Tuesday Wednesday
Fog on Overnight Morning Fog on Thursday 20% chance of rain on Friday Mostly Sunny on Saturday Sunny on Sunday Partly Sunny on Monday 20% chance of rain on Tuesday Partly Sunny on Wednesday
Low: 42°F High: 48°F High: 53°F High: 50°F High: 57°F High: 54°F High: 54°F High: 44°F
Low: 45°F Low: 34°F Low: 37°F Low: 36°F Low: 42°F Low: 36°F  
Fog Morning Fog Rain Mostly Sunny Sunny Partly Sunny Rain Partly Sunny
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Current Conditions at
JOLIET - (KJOT)
45°
Cloudy
Mist
as of 12:55 AM CST
Rel. Humidity: 93%
Dew Point: 43°F
Visibility: 3 Miles
Pressure: 30.15 in.
Flight Rule: IFR
Wind Data
Calm
Cloud Level(s): Solid Overcast at 500ft
Current Conditions at
ROMEOVILLE WFO - (KLOT)
43°
Cloudy
Mist
as of 12:55 AM CST
Rel. Humidity: 93%
Dew Point: 41°F
Visibility: 2 1/2 Miles
Pressure: 30.15 in.
Flight Rule: IFR
Wind Data
6 MPH
170° South
Cloud Level(s): Solid Overcast at 500ft
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
43°
Cloudy
Mist
as of 12:55 AM CST
Rel. Humidity: 100%
Dew Point: 43°F
Visibility: 3 Miles
Pressure: 30.14 in.
Flight Rule: IFR
Wind Data
3 MPH
190° South
Cloud Level(s): Solid Overcast at 500ft
Current Conditions at
CHICAGO-MIDWAY - (KMDW)
43°
Cloudy
Mist
as of 12:53 AM CST
Rel. Humidity: 86%
Dew Point: 39°F
Visibility: 3 Miles
Pressure: 30.14 in.
Flight Rule: IFR
Wind Data
5 MPH
190° South
Cloud Level(s): Broken at 900ft, Solid Overcast at 3100ft
Fog on Overnight Overnight... Patchy drizzle and fog. Cloudy, with a low around 42. Calm wind.

Morning Fog on Thursday Thursday... Patchy fog before 9am. Otherwise, cloudy, with a high near 48. Light south wind becoming south southwest 5 to 10 mph in the morning.

Cloudy on Thursday Night Thursday Night... Cloudy, with a low around 45. South wind around 5 mph becoming calm in the evening.

20% chance of rain Friday Friday... A 20 percent chance of rain. Cloudy, with a high near 53. North northeast wind around 5 mph, with gusts as high as 15 mph.

20% chance of rain Friday Night Friday Night... A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 34. North northeast wind around 5 mph, with gusts as high as 10 mph.

Mostly Sunny on Saturday Saturday... Mostly sunny, with a high near 50.

Mostly Clear on Saturday Night Saturday Night... Mostly clear, with a low around 37.

Sunny on Sunday Sunday... Sunny, with a high near 57.

Cloudy on Sunday Night Sunday Night... Partly cloudy, with a low around 36.

Partly Sunny on Monday Monday... Partly sunny, with a high near 54.

20% chance of rain Monday Night Monday Night... A chance of rain. Cloudy, with a low around 42.

20% chance of rain Tuesday Tuesday... A chance of rain. Mostly cloudy, with a high near 54.

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

Partly Sunny on Wednesday Wednesday... Partly sunny, with a high near 44.

Current Radar Image


Sun Almanac for Union, Illinois
Sunrise: 06:47 AM
Sunset: 4:28 PM
Civil Sunrise:06:17 AM
Civil Sunset: 4:58 PM
Nautical Sunrise: 05:43 AM
Nautical Sunset: 5:32 PM
Astro Sunrise: 05:10 AM
Astro Sunset: 6:05 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.