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Union, Illinois Weather Forecast
Union, Illinois Weather
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Weather Forecast for Union, Illinois : Will County
Issued: 11:26 am CST Dec 29, 2025 Latitude: 41.4969757 Longitude: -88.0233891 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Tuesday Wednesday New Year's Day Friday Saturday Sunday
20% chance of snow on Today Mostly Cloudy on Tonight Increasing Clouds on Tuesday 50% chance of snow on Wednesday Mostly Sunny on New Year's Day Partly Sunny on Friday Partly Sunny on Saturday Partly Sunny on Sunday
High: 21°F Low: 14°F High: 29°F High: 32°F High: 20°F High: 25°F High: 27°F High: 30°F
Low: 25°F Low: 11°F Low: 12°F Low: 15°F Low: 16°F  
Snow Mostly Cloudy Increasing Clouds Snow Mostly Sunny Partly Sunny Partly Sunny Partly Sunny
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Current Conditions at
JOLIET - (KJOT)
23°
Feels like 10°F
Cloudy
Light Snow
as of 10:55 AM CST
Rel. Humidity: 79%
Dew Point: 18°F
Visibility: 2 Miles
Pressure: 30.03 in.
Flight Rule: IFR
Wind Data
14 MPH
Gust: 22 MPH
280° West
Cloud Level(s): Scattered at 1500ft, Solid Overcast at 2500ft
Current Conditions at
ROMEOVILLE WFO - (KLOT)
21°
Feels like 4°F
Cloudy
Blowing Snow Haze
as of 10:45 AM CST
Rel. Humidity: 79%
Dew Point: 16°F
Visibility: 2 1/2 Miles
Pressure: 29.99 in.
Flight Rule: IFR
Wind Data
25 MPH
Gust: 36 MPH
270° West
Cloud Level(s): Solid Overcast at 2400ft
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
21°
Feels like 5°F
Cloudy
Light Snow
as of 10:55 AM CST
Rel. Humidity: 79%
Dew Point: 16°F
Visibility: 7 Miles
Pressure: 30.04 in.
Flight Rule: MVFR
Wind Data
21 MPH
Gust: 33 MPH
290° West
Cloud Level(s): Broken at 1600ft, Solid Overcast at 2900ft
Current Conditions at
CHICAGO-MIDWAY - (KMDW)
23°
Feels like 8°F
Cloudy
Light Snow Mist
as of 11:11 AM CST
Rel. Humidity: 73%
Dew Point: 16°F
Visibility: 1 1/2 Miles
Pressure: 29.96 in.
Flight Rule: IFR
Wind Data
18 MPH
Gust: 31 MPH
300° Northwest
Cloud Level(s): Solid Overcast at 2500ft
20% chance of snow Today Today... A chance of flurries. Mostly cloudy, with a high near 21. Blustery, with a west northwest wind 15 to 25 mph, with gusts as high as 35 mph.
Mostly Cloudy on Tonight Tonight... Mostly cloudy, with a low around 14. Wind chill values as low as 1. West northwest wind 10 to 15 mph, with gusts as high as 30 mph.
Increasing Clouds on Tuesday Tuesday... Increasing clouds, with a high near 29. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 25. West wind 10 to 15 mph, with gusts as high as 20 mph.
50% chance of snow Wednesday Wednesday... A 50 percent chance of snow after noon. Cloudy, with a high near 32. West northwest wind 10 to 15 mph, with gusts as high as 25 mph.
40% chance of snow Wednesday Night Wednesday Night... A 40 percent chance of snow before midnight. Mostly cloudy, with a low around 11.
Mostly Sunny on New Year's Day New Year's Day... Mostly sunny, with a high near 20.
Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 12.
Partly Sunny on Friday Friday... Partly sunny, with a high near 25.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 15.
Partly Sunny on Saturday Saturday... Partly sunny, with a high near 27.
Mostly Cloudy on Saturday Night Saturday Night... Mostly cloudy, with a low around 16.
Partly Sunny on Sunday Sunday... Partly sunny, with a high near 30.
Current Radar Image


Sun Almanac for Union, Illinois
Sunrise: 07:18 AM
Sunset: 4:31 PM
Civil Sunrise:06:47 AM
Civil Sunset: 5:02 PM
Nautical Sunrise: 06:12 AM
Nautical Sunset: 5:37 PM
Astro Sunrise: 05:38 AM
Astro Sunset: 6:10 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.