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Union, Illinois Weather Forecast
Union, Illinois Weather
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Weather Forecast for Union, Illinois : Will County
Issued: 10:41 pm CST Dec 5, 2025 Latitude: 41.4969757 Longitude: -88.0233891 View on Google Maps

MouseOver for Detail Forecast
Tonight Saturday Sunday Monday Tuesday Wednesday Thursday Friday
20% chance of 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 Mostly Cloudy on Thursday Mostly Cloudy on Friday
Low: 28°F High: 28°F High: 27°F High: 21°F High: 36°F High: 36°F High: 27°F High: 19°F
Low: 26 °F Low: 12°F Low: 12°F Low: 32°F Low: 16°F Low: 11°F  
Snow Mostly Cloudy Snow Partly Sunny Mostly Cloudy Rain & Snow Mostly Cloudy Mostly Cloudy
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Current Conditions at
JOLIET - (KJOT)
32°
Cloudy
as of 11:35 PM CST
Rel. Humidity: 68%
Dew Point: 23°F
Visibility: 10 Miles
Pressure: 29.80 in.
Flight Rule: MVFR
Wind Data
5 MPH
230° Southwest
Cloud Level(s): Broken at 2300ft, Solid Overcast at 3000ft
Current Conditions at
ROMEOVILLE WFO - (KLOT)
28°
Feels like 19°F
Cloudy
as of 11:10 PM CST
Rel. Humidity: 68%
Dew Point: 19°F
Visibility: 10 Miles
Pressure: 29.79 in.
Flight Rule: MVFR
Wind Data
9 MPH
210° Southwest
Cloud Level(s): Solid Overcast at 3000ft
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
32°
Feels like 22°F
Cloudy
as of 11:35 PM CST
Rel. Humidity: 74%
Dew Point: 25°F
Visibility: 10 Miles
Pressure: 29.79 in.
Flight Rule: MVFR
Wind Data
13 MPH
Gust: 20 MPH
240° Southwest
Cloud Level(s): Broken at 2000ft, Solid Overcast at 3900ft
Current Conditions at
CHICAGO-MIDWAY - (KMDW)
28°
Feels like 17°F
Cloudy
as of 10:53 PM CST
Rel. Humidity: 63%
Dew Point: 18°F
Visibility: 10 Miles
Pressure: 29.78 in.
Flight Rule: VFR
Wind Data
13 MPH
230° Southwest
Cloud Level(s): Solid Overcast at 3800ft
20% chance of snow Tonight Tonight... A 20 percent chance of snow before 3am. Cloudy, with a steady temperature around 28. Southwest wind around 10 mph, with gusts as high as 15 mph.
Mostly Cloudy on Saturday Saturday... Mostly cloudy, with a high near 28. West wind 5 to 10 mph becoming light southwest in the afternoon.
70% chance of snow Saturday Night Saturday Night... Snow likely, mainly after midnight. Cloudy, with a temperature rising to around 26 by 4am. Calm wind becoming east southeast around 5 mph after midnight. Chance of precipitation is 70%. New snow accumulation of 1 to 3 inches possible.
60% chance of snow Sunday Sunday... Snow likely, mainly before noon. Mostly cloudy, with a high near 27. East northeast wind 5 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.
20% chance of snow Sunday Night Sunday Night... A 20 percent chance of snow showers. Mostly cloudy, with a low around 12. North wind 5 to 10 mph, with gusts as high as 15 mph.
Partly Sunny on Monday Monday... Partly sunny, with a high near 21.
20% chance of snow Monday Night Monday Night... A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 12.
Mostly Cloudy on Tuesday Tuesday... Mostly cloudy, with a high near 36.
70% chance of rain Tuesday Night Tuesday Night... Rain likely, mainly after midnight. Cloudy, with a low around 32.
20% chance of rain & snow Wednesday Wednesday... A chance of rain and snow showers before noon, then a chance of snow showers. Cloudy, with a high near 36.
20% chance of snow Wednesday Night Wednesday Night... A chance of snow showers. Mostly cloudy, with a low around 16.
Mostly Cloudy on Thursday Thursday... Mostly cloudy, with a high near 27.
20% chance of snow Thursday Night Thursday Night... A chance of snow. Mostly cloudy, with a low around 11.
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.