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Union, Illinois Weather Forecast
Union, Illinois Weather
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Weather Forecast for Union, Illinois : Will County
Issued: 1:16 am CST Jan 18, 2026 Latitude: 41.4969757 Longitude: -88.0233891 View on Google Maps

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Overnight Sunday M.L.King Day Tuesday Wednesday Thursday Friday Saturday
20% chance of snow on Overnight 50% chance of snow on Sunday Mostly Sunny on M.L.King Day Mostly Sunny on Tuesday Mostly Cloudy on Wednesday Mostly Sunny on Thursday 20% chance of snow on Friday 20% chance of snow on Saturday
Low: 11°F High: 20°F High: 9 °F High: 23°F High: 30°F High: 21°F High: 29°F High: 17°F
Low: 2 °F Low: 3 °F Low: 17°F Low: 12°F Low: 14°F Low: 11°F  
Snow Snow Mostly Sunny Mostly Sunny Mostly Cloudy Mostly Sunny Snow Snow
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Current Conditions at
JOLIET - (KJOT)
14°
Feels like 1°F
Mostly Cloudy
as of 12:55 AM CST
Rel. Humidity: 72%
Dew Point: 7°F
Visibility: 10 Miles
Pressure: 30.11 in.
Flight Rule: MVFR
Wind Data
10 MPH
Gust: 16 MPH
260° West
Cloud Level(s): Broken at 1700ft
Current Conditions at
ROMEOVILLE WFO - (KLOT)
12°
Feels like -3°F
Cloudy
Light Snow
as of 12:55 AM CST
Rel. Humidity: 78%
Dew Point: 7°F
Visibility: 9 Miles
Pressure: 30.09 in.
Flight Rule: IFR
Wind Data
14 MPH
250° West
Cloud Level(s): Broken at 900ft, Solid Overcast at 1500ft
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
12°
Feels like -4°F
Partly Cloudy
Light Snow
as of 12:55 AM CST
Rel. Humidity: 72%
Dew Point: 5°F
Visibility: 10 Miles
Pressure: 30.10 in.
Flight Rule: VFR
Wind Data
17 MPH
Gust: 23 MPH
270° West
Cloud Level(s): Scattered at 1500ft, Scattered at 3200ft
Current Conditions at
CHICAGO-MIDWAY - (KMDW)
12°
Feels like -4°F
Mostly Cloudy
Light Snow
as of 12:53 AM CST
Rel. Humidity: 78%
Dew Point: 7°F
Visibility: 7 Miles
Pressure: 30.06 in.
Flight Rule: VFR
Wind Data
17 MPH
Gust: 23 MPH
250° West
Cloud Level(s): Scattered at 1500ft, Broken at 7000ft, Broken at 11000ft
20% chance of snow Overnight Overnight... A chance of flurries. Mostly cloudy, with a steady temperature around 11. Wind chill values as low as -5. West wind 10 to 15 mph, with gusts as high as 20 mph.
50% chance of snow Sunday Sunday... A 50 percent chance of snow, mainly after 5pm. Mostly cloudy, with a high near 20. Wind chill values as low as -5. Southwest wind 10 to 15 mph, with gusts as high as 20 mph.
90% chance of snow Sunday Night Sunday Night... Snow, mainly before 11pm. Low around 2. Wind chill values as low as -16. Blustery, with a southwest wind 10 to 15 mph becoming west northwest 20 to 25 mph after midnight. Winds could gust as high as 35 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.
Mostly Sunny on M.L.King Day M.L.King Day... Mostly sunny and cold, with a high near 9. Wind chill values as low as -18. Blustery, with a west northwest wind 15 to 20 mph, with gusts as high as 30 mph.
Mostly Cloudy on Monday Night Monday Night... Mostly cloudy, with a low around 3. West wind 5 to 10 mph, with gusts as high as 20 mph.
Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 23.
30% chance of snow Tuesday Night Tuesday Night... A 30 percent chance of snow. Mostly cloudy, with a low around 17.
Mostly Cloudy on Wednesday Wednesday... Mostly cloudy, with a high near 30.
Mostly Cloudy on Wednesday Night Wednesday Night... Mostly cloudy, with a low around 12.
Mostly Sunny on Thursday Thursday... Mostly sunny, with a high near 21.
Mostly Cloudy on Thursday Night Thursday Night... Mostly cloudy, with a low around 14.
20% chance of snow Friday Friday... A chance of snow. Mostly cloudy, with a high near 29.
20% chance of snow Friday Night Friday Night... A chance of snow. Mostly cloudy, with a low around 11.
20% chance of snow Saturday Saturday... A chance of snow. Partly sunny, with a high near 17.
Current Radar Image


Sun Almanac for Union, Illinois
Sunrise: 07:15 AM
Sunset: 4:51 PM
Civil Sunrise:06:44 AM
Civil Sunset: 5:21 PM
Nautical Sunrise: 06:10 AM
Nautical Sunset: 5:55 PM
Astro Sunrise: 05:37 AM
Astro Sunset: 6:28 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.