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Union, Illinois Weather Forecast
Union, Illinois Weather
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Weather Forecast for Union, Illinois : Will County
Issued: 6:16 am CST Dec 6, 2025 Latitude: 41.4969757 Longitude: -88.0233891 View on Google Maps

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Today Tonight Sunday Monday Tuesday Wednesday Thursday Friday
Mostly Cloudy on Today 90% chance of snow on Tonight 60% chance of snow on Sunday Partly Sunny on Monday Mostly Cloudy on Tuesday 20% chance of rain & snow on Wednesday 20% chance of snow on Thursday Mostly Cloudy on Friday
High: 30°F Low: 28 °F High: 20 °F High: 21°F High: 37°F High: 35°F High: 24°F High: 19°F
Low: 10°F Low: 10°F Low: 33°F Low: 15°F Low: 12°F  
Mostly Cloudy Snow Snow Partly Sunny Mostly Cloudy Rain & Snow Snow Mostly Cloudy
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Current Conditions at
JOLIET - (KJOT)
28°
Cloudy
as of 7:35 AM CST
Rel. Humidity: 92%
Dew Point: 27°F
Visibility: 7 Miles
Pressure: 29.92 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Solid Overcast at 3600ft
Current Conditions at
ROMEOVILLE WFO - (KLOT)
25°
Mostly Cloudy
Mist
as of 6:45 AM CST
Rel. Humidity: 92%
Dew Point: 23°F
Visibility: 6 Miles
Pressure: 29.89 in.
Flight Rule: VFR
Wind Data
3 MPH
210° Southwest
Cloud Level(s): Few at 1200ft, Broken at 3700ft
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
30°
Cloudy
as of 7:35 AM CST
Rel. Humidity: 92%
Dew Point: 28°F
Visibility: 10 Miles
Pressure: 29.91 in.
Flight Rule: VFR
Wind Data
5 MPH
270° West
Cloud Level(s): Scattered at 1400ft, Solid Overcast at 3500ft
Current Conditions at
CHICAGO-MIDWAY - (KMDW)
28°
Mostly Cloudy
as of 6:53 AM CST
Rel. Humidity: 86%
Dew Point: 25°F
Visibility: 10 Miles
Pressure: 29.88 in.
Flight Rule: VFR
Wind Data
6 MPH
290° West
Cloud Level(s): Broken at 3700ft
Mostly Cloudy on Today Today... Mostly cloudy, with a high near 30. West wind around 5 mph becoming calm in the afternoon. Winds could gust as high as 10 mph.
90% chance of snow Tonight Tonight... Snow, mainly after midnight. Temperature rising to around 28 by 3am. Light south southeast wind becoming east southeast 5 to 10 mph after midnight. Chance of precipitation is 90%. New snow accumulation of 1 to 3 inches possible.
60% chance of snow Sunday Sunday... Snow likely, mainly before noon. Cloudy, then gradually becoming mostly sunny, with a temperature falling to around 20 by 5pm. East southeast wind 10 to 15 mph becoming north in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible.
30% chance of snow Sunday Night Sunday Night... A 30 percent chance of snow showers, mainly before midnight. Mostly cloudy, with a low around 10. North wind 5 to 10 mph becoming east after midnight. Winds could gust as high as 15 mph.
Partly Sunny on Monday Monday... Partly sunny, with a high near 21. East wind around 5 mph becoming south in the afternoon. Winds could gust as high as 10 mph.
20% chance of snow Monday Night Monday Night... A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 10.
Mostly Cloudy on Tuesday Tuesday... Mostly cloudy, with a high near 37.
70% chance of rain Tuesday Night Tuesday Night... Rain likely. Cloudy, with a low around 33.
20% chance of rain & snow Wednesday Wednesday... A chance of rain and snow before noon, then a chance of snow. Mostly cloudy, with a high near 35.
20% chance of snow Wednesday Night Wednesday Night... A chance of snow before midnight. Mostly cloudy, with a low around 15.
20% chance of snow Thursday Thursday... A chance of snow. Mostly cloudy, with a high near 24.
Mostly Cloudy on Thursday Night Thursday Night... Mostly cloudy, with a low around 12.
Mostly Cloudy on Friday Friday... Mostly cloudy, with a high near 19.
Current Radar Image


Sun Almanac for Union, Illinois
Sunrise: 07:04 AM
Sunset: 4:22 PM
Civil Sunrise:06:33 AM
Civil Sunset: 4:53 PM
Nautical Sunrise: 05:59 AM
Nautical Sunset: 5:28 PM
Astro Sunrise: 05:25 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.