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Union, Illinois Weather Forecast
Union, Illinois Weather
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Weather Forecast for Union, Illinois : Will County
Issued: 9:06 am CST Dec 5, 2025 Latitude: 41.4969757 Longitude: -88.0233891 View on Google Maps

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Today Tonight Saturday Sunday Monday Tuesday Wednesday Thursday
Partly Sunny on Today 30% chance of freezing rain & snow on Tonight Mostly Cloudy on Saturday 60% chance of snow on Sunday Partly Sunny on Monday Mostly Cloudy on Tuesday 20% chance of rain & snow on Wednesday Partly Sunny on Thursday
High: 26°F Low: 28 °F High: 28 °F High: 27°F High: 20°F High: 35°F High: 35°F High: 22°F
Low: 18°F Low: 6°F Low: 12°F Low: 29°F Low: 14°F  
Partly Sunny Freezing Rain & Snow Mostly Cloudy Snow Partly Sunny Mostly Cloudy Rain & Snow Partly Sunny
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Current Conditions at
JOLIET - (KJOT)
21°
Partly Cloudy
as of 10:35 AM CST
Rel. Humidity: 100%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 30.00 in.
Flight Rule: VFR
Wind Data
6 MPH
210° Southwest
Cloud Level(s): Scattered at 7000ft
Current Conditions at
ROMEOVILLE WFO - (KLOT)
16°
Feels like 2°F
Mostly Cloudy
as of 9:45 AM CST
Rel. Humidity: 92%
Dew Point: 14°F
Visibility: 8 Miles
Pressure: 30.01 in.
Flight Rule: VFR
Wind Data
13 MPH
200° South
Cloud Level(s): Scattered at 5000ft, Broken at 6000ft
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
19°
Feels like 7°F
Mostly Cloudy
as of 10:35 AM CST
Rel. Humidity: 85%
Dew Point: 16°F
Visibility: 10 Miles
Pressure: 29.98 in.
Flight Rule: VFR
Wind Data
10 MPH
190° South
Cloud Level(s): Broken at 7500ft
Current Conditions at
CHICAGO-MIDWAY - (KMDW)
18°
Feels like 3°F
Mostly Cloudy
as of 9:53 AM CST
Rel. Humidity: 78%
Dew Point: 12°F
Visibility: 9 Miles
Pressure: 29.99 in.
Flight Rule: VFR
Wind Data
15 MPH
Gust: 24 MPH
210° Southwest
Cloud Level(s): Broken at 5000ft, Broken at 20000ft
Partly Sunny on Today Today... Partly sunny, with a high near 26. South southwest wind around 10 mph, with gusts as high as 20 mph.
30% chance of freezing rain & snow Tonight Tonight... Patchy snow and freezing rain between 9pm and 3am. Mostly cloudy, with a temperature rising to around 28 by 4am. South southwest wind 10 to 15 mph becoming west after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 30%.
Mostly Cloudy on Saturday Saturday... Mostly cloudy, with a temperature rising to near 28 by 9am, then falling to around 22 during the remainder of the day. West northwest wind around 5 mph becoming calm in the afternoon. Winds could gust as high as 15 mph.
70% chance of snow Saturday Night Saturday Night... Snow likely, mainly after midnight. Cloudy, with a low around 18. Calm wind becoming east northeast around 5 mph after midnight. Winds could gust as high as 10 mph. Chance of precipitation is 70%. New snow accumulation of 1 to 2 inches possible.
60% chance of snow Sunday Sunday... Snow likely before noon. Mostly cloudy, with a high near 27. East northeast wind 5 to 10 mph becoming north in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%.
20% chance of snow Sunday Night Sunday Night... A 20 percent chance of snow showers before midnight. Mostly cloudy, with a low around 6.
Partly Sunny on Monday Monday... Partly sunny, with a high near 20.
20% chance of snow Monday Night Monday Night... A chance of snow. Mostly cloudy, with a low around 12.
Mostly Cloudy on Tuesday Tuesday... Mostly cloudy, with a high near 35.
20% chance of rain & snow Tuesday Night Tuesday Night... A chance of rain and snow before midnight, then rain likely. Cloudy, with a low around 29.
20% chance of rain & snow Wednesday Wednesday... A chance of rain and snow. Cloudy, with a high near 35.
20% chance of snow Wednesday Night Wednesday Night... A chance of snow. Mostly cloudy, with a low around 14.
Partly Sunny on Thursday Thursday... Partly sunny, with a high near 22.
Current Radar Image


Sun Almanac for Union, Illinois
Sunrise: 07:04 AM
Sunset: 4:22 PM
Civil Sunrise:06:32 AM
Civil Sunset: 4:53 PM
Nautical Sunrise: 05:58 AM
Nautical Sunset: 5:28 PM
Astro Sunrise: 05:24 AM
Astro Sunset: 6:01 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.