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Union, Illinois Weather Forecast
Union, Illinois Weather
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Weather Forecast for Union, Illinois : Will County
Issued: 9:11 pm CST Dec 6, 2025 Latitude: 41.4969757 Longitude: -88.0233891 View on Google Maps

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Tonight Sunday Monday Tuesday Wednesday Thursday Friday Saturday
100% chance of snow on Tonight 70% 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 Partly Sunny on Friday Partly Sunny on Saturday
Low: 29°F High: 18 °F High: 21°F High: 38°F High: 37°F High: 26°F High: 17°F High: 12°F
Low: 10°F Low: 12°F Low: 34°F Low: 18°F Low: 10°F Low: 0°F  
Snow Snow Partly Sunny Mostly Cloudy Rain & Snow Snow Partly Sunny Partly Sunny
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Current Conditions at
JOLIET - (KJOT)
34°
Cloudy
as of 9:15 PM CST
Rel. Humidity: 86%
Dew Point: 30°F
Visibility: 10 Miles
Pressure: 29.99 in.
Flight Rule: MVFR
Wind Data
3 MPH
170° South
Cloud Level(s): Solid Overcast at 2900ft
Current Conditions at
ROMEOVILLE WFO - (KLOT)
32°
Cloudy
as of 9:15 PM CST
Rel. Humidity: 86%
Dew Point: 28°F
Visibility: 10 Miles
Pressure: 29.99 in.
Flight Rule: MVFR
Wind Data
8 MPH
150° Southeast
Cloud Level(s): Solid Overcast at 2800ft
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
32°
Cloudy
as of 9:15 PM CST
Rel. Humidity: 92%
Dew Point: 30°F
Visibility: 10 Miles
Pressure: 29.98 in.
Flight Rule: MVFR
Wind Data
8 MPH
180° South
Cloud Level(s): Solid Overcast at 2900ft
Current Conditions at
CHICAGO-MIDWAY - (KMDW)
34°
Cloudy
as of 8:53 PM CST
Rel. Humidity: 69%
Dew Point: 25°F
Visibility: 10 Miles
Pressure: 29.98 in.
Flight Rule: MVFR
Wind Data
6 MPH
160° South
Cloud Level(s): Solid Overcast at 2600ft
100% chance of snow Tonight Tonight... Snow, mainly after 11pm. Low around 29. Southeast wind around 5 mph becoming north northeast after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 100%. Total nighttime snow accumulation of 2 to 4 inches possible.
70% chance of snow Sunday Sunday... Snow likely before 9am. Cloudy, then gradually becoming mostly sunny, with a temperature falling to around 18 by 5pm. North wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New snow accumulation of less than one inch possible.
20% chance of snow Sunday Night Sunday Night... A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 10. North wind 5 to 10 mph becoming light and variable after midnight. Winds could gust as high as 15 mph.
Partly Sunny on Monday Monday... Partly sunny, with a high near 21. Calm wind becoming south southeast around 5 mph in the morning. 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 12. South wind 5 to 15 mph, with gusts as high as 25 mph.
Mostly Cloudy on Tuesday Tuesday... Mostly cloudy, with a high near 38.
80% chance of rain Tuesday Night Tuesday Night... Rain. Low around 34. Chance of precipitation is 80%.
20% chance of rain & snow Wednesday Wednesday... A chance of rain and snow before noon. Cloudy, with a high near 37.
20% chance of snow Wednesday Night Wednesday Night... A chance of snow before midnight. Mostly cloudy, with a low around 18.
20% chance of snow Thursday Thursday... A chance of snow. Mostly cloudy, with a high near 26.
20% chance of snow Thursday Night Thursday Night... A chance of snow. Mostly cloudy, with a low around 10.
Partly Sunny on Friday Friday... Partly sunny, with a high near 17.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 0.
Partly Sunny on Saturday Saturday... Partly sunny, with a high near 12.
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.