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Union, Illinois Weather Forecast
Union, Illinois Weather
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Weather Forecast for Union, Illinois : Will County
Issued: 6:11 am CST Dec 4, 2025 Latitude: 41.4969757 Longitude: -88.0233891 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Friday Saturday Sunday Monday Tuesday Wednesday
Sunny on Today Cloudy on Tonight Mostly Cloudy on Friday Mostly Cloudy on Saturday 30% chance of snow on Sunday Partly Sunny on Monday Mostly Cloudy on Tuesday 20% chance of rain & snow on Wednesday
High: 16°F Low: -3 °F High: 28°F High: 29°F High: 26°F High: 21°F High: 32°F High: 33°F
Low: 22°F Low: 15°F Low: 8°F Low: 14°F Low: 22°F  
Sunny Cloudy Mostly Cloudy Mostly Cloudy Snow Partly Sunny Mostly Cloudy Rain & Snow
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Current Conditions at
JOLIET - (KJOT)
14°
Clear
as of 9:35 AM CST
Rel. Humidity: 51%
Dew Point: -0°F
Visibility: 10 Miles
Pressure: 30.44 in.
Flight Rule: VFR
Wind Data
3 MPH
020° North
Cloud Level(s): Clear
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
5°
Clear
as of 9:35 AM CST
Rel. Humidity: 71%
Dew Point: -2°F
Visibility: 10 Miles
Pressure: 30.43 in.
Flight Rule: VFR
Wind Data
5 MPH
320° Northwest
Cloud Level(s): Clear
Current Conditions at
CHICAGO-MIDWAY - (KMDW)
10°
Feels like -3°F
Mostly Clear
as of 8:53 AM CST
Rel. Humidity: 60%
Dew Point: -0°F
Visibility: 10 Miles
Pressure: 30.41 in.
Flight Rule: VFR
Wind Data
10 MPH
340° North
Cloud Level(s): Few at 5000ft, Few at 25000ft
Sunny on Today Today... Sunny, with a high near 16. Wind chill values as low as 1. North northwest wind around 5 mph becoming calm in the afternoon.
Cloudy on Tonight Tonight... Partly cloudy, with a temperature falling to near -3 by 9pm, then rising to around 6 during the remainder of the night. Wind chill values as low as -15. South wind 5 to 10 mph.
Mostly Cloudy on Friday Friday... Mostly cloudy, then gradually becoming sunny, with a high near 28. Wind chill values as low as -5. South southwest wind around 10 mph, with gusts as high as 15 mph.
20% chance of snow Friday Night Friday Night... A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 22. South southwest wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 15 mph.
Mostly Cloudy on Saturday Saturday... Mostly cloudy, with a high near 29. West wind around 5 mph, with gusts as high as 10 mph.
40% chance of snow Saturday Night Saturday Night... A 40 percent chance of snow, mainly after midnight. Mostly cloudy, with a low around 15.
30% chance of snow Sunday Sunday... A 30 percent chance of snow before noon. Mostly cloudy, with a high near 26.
Mostly Cloudy on Sunday Night Sunday Night... Mostly cloudy, with a low around 8.
Partly Sunny on Monday Monday... Partly sunny, with a high near 21.
20% chance of snow Monday Night Monday Night... A chance of snow. Mostly cloudy, with a low around 14.
Mostly Cloudy on Tuesday Tuesday... Mostly cloudy, with a high near 32.
20% chance of snow Tuesday Night Tuesday Night... A chance of snow. Mostly cloudy, with a low around 22.
20% chance of rain & snow Wednesday Wednesday... A chance of rain and snow. Mostly cloudy, with a high near 33.
Current Radar Image


Sun Almanac for Union, Illinois
Sunrise: 07:03 AM
Sunset: 4:22 PM
Civil Sunrise:06:32 AM
Civil Sunset: 4:53 PM
Nautical Sunrise: 05:57 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.