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Union, Illinois Weather Forecast
Union, Illinois Weather
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Weather Forecast for Union, Illinois : Will County
Issued: 3:11 pm CST Dec 25, 2025 Latitude: 41.4969757 Longitude: -88.0233891 View on Google Maps

MouseOver for Detail Forecast
Tonight Friday Saturday Sunday Monday Tuesday Wednesday New Year's Day
60% chance of rain on Tonight 40% chance of rain on Friday Morning Fog on Saturday 80% chance of rain on Sunday Partly Sunny on Monday Mostly Sunny on Tuesday Partly Sunny on Wednesday Partly Sunny on New Year's Day
Low: 41°F High: 53°F High: 52°F High: 55°F High: 24°F High: 28°F High: 31°F High: 26°F
Low: 37°F Low: 47°F Low: 18°F Low: 14°F Low: 20°F Low: 16°F  
Rain Rain Morning Fog Rain Partly Sunny Mostly Sunny Partly Sunny Partly Sunny
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Current Conditions at
JOLIET - (KJOT)
43°
Cloudy
as of 5:15 PM CST
Rel. Humidity: 75%
Dew Point: 36°F
Visibility: 10 Miles
Pressure: 30.06 in.
Flight Rule: VFR
Wind Data
8 MPH
080° East
Cloud Level(s): Scattered at 2900ft, Solid Overcast at 3500ft
Current Conditions at
ROMEOVILLE WFO - (KLOT)
41°
Feels like 33°F
Cloudy
as of 5:12 PM CST
Rel. Humidity: 80%
Dew Point: 36°F
Visibility: 9 Miles
Pressure: 30.06 in.
Flight Rule: VFR
Wind Data
14 MPH
060° Northeast
Cloud Level(s): Scattered at 2400ft, Solid Overcast at 3300ft
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
43°
Feels like 36°F
Cloudy
as of 5:15 PM CST
Rel. Humidity: 81%
Dew Point: 37°F
Visibility: 10 Miles
Pressure: 30.05 in.
Flight Rule: MVFR
Wind Data
10 MPH
090° East
Cloud Level(s): Broken at 2700ft, Solid Overcast at 3800ft
Current Conditions at
CHICAGO-MIDWAY - (KMDW)
41°
Feels like 34°F
Cloudy
as of 4:53 PM CST
Rel. Humidity: 75%
Dew Point: 34°F
Visibility: 10 Miles
Pressure: 30.07 in.
Flight Rule: VFR
Wind Data
12 MPH
070° East
Cloud Level(s): Solid Overcast at 3200ft
60% chance of rain Tonight Tonight... Showers likely, mainly after 5am. Patchy fog after 3am. Otherwise, cloudy, with a low around 41. Southeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
40% chance of rain Friday Friday... Scattered showers before 9am. Patchy fog before noon. Otherwise, cloudy, with a high near 53. South southeast wind 5 to 15 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 40%.
Patchy Fog on Friday Night Friday Night... Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 37. Northwest wind around 5 mph becoming calm in the evening. Winds could gust as high as 15 mph.
Morning Fog on Saturday Saturday... Patchy fog before 9am. Otherwise, mostly cloudy, with a high near 52. Southeast wind 5 to 10 mph, with gusts as high as 15 mph.
40% chance of rain Saturday Night Saturday Night... A 40 percent chance of rain after midnight. Cloudy, with a low around 47. Southeast wind around 10 mph becoming south southwest after midnight. Winds could gust as high as 20 mph.
80% chance of rain Sunday Sunday... Rain. High near 55. Chance of precipitation is 80%.
50% chance of rain & snow Sunday Night Sunday Night... A chance of rain and snow, mainly before midnight. Cloudy, with a low around 18. Blustery. Chance of precipitation is 50%.
Partly Sunny on Monday Monday... Partly sunny, with a high near 24. Blustery.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 14.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 28.
Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 20.
Partly Sunny on Wednesday Wednesday... Partly sunny, with a high near 31.
Mostly Cloudy on Wednesday Night Wednesday Night... Mostly cloudy, with a low around 16.
Partly Sunny on New Year's Day New Year's Day... Partly sunny, with a high near 26.
Current Radar Image


Sun Almanac for Union, Illinois
Sunrise: 07:17 AM
Sunset: 4:28 PM
Civil Sunrise:06:46 AM
Civil Sunset: 4:59 PM
Nautical Sunrise: 06:11 AM
Nautical Sunset: 5:34 PM
Astro Sunrise: 05:37 AM
Astro Sunset: 6:08 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.