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Union, Illinois Weather Forecast
Union, Illinois Weather
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Weather Forecast for Union, Illinois : Will County
Issued: 1:36 am CST Dec 12, 2025 Latitude: 41.4969757 Longitude: -88.0233891 View on Google Maps

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Overnight Friday Saturday Sunday Monday Tuesday Wednesday Thursday
Mostly Cloudy on Overnight Partly Sunny on Friday 80% chance of snow on Saturday Sunny on Sunday Partly Sunny on Monday Partly Sunny on Tuesday Mostly Cloudy on Wednesday 20% chance of rain on Thursday
Low: 25°F High: 30°F High: 13°F High: 9°F High: 22°F High: 36°F High: 45°F High: 46°F
Low: 8 °F Low: -4°F Low: -2°F Low: 14°F Low: 30°F Low: 36°F  
Mostly Cloudy Partly Sunny Snow Sunny Partly Sunny Partly Sunny Mostly Cloudy Rain
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Current Conditions at
JOLIET - (KJOT)
28°
Cloudy
as of 2:15 AM CST
Rel. Humidity: 86%
Dew Point: 25°F
Visibility: 10 Miles
Pressure: 30.07 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Solid Overcast at 9000ft
Current Conditions at
ROMEOVILLE WFO - (KLOT)
27°
Cloudy
as of 2:10 AM CST
Rel. Humidity: 79%
Dew Point: 21°F
Visibility: 10 Miles
Pressure: 30.07 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Few at 4300ft, Scattered at 8000ft, Solid Overcast at 8500ft
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
25°
Mostly Cloudy
Mist
as of 2:15 AM CST
Rel. Humidity: 100%
Dew Point: 25°F
Visibility: 5 Miles
Pressure: 30.06 in.
Flight Rule: MVFR
Wind Data
Calm
Cloud Level(s): Broken at 7500ft
Current Conditions at
CHICAGO-MIDWAY - (KMDW)
27°
Cloudy
as of 1:53 AM CST
Rel. Humidity: 68%
Dew Point: 18°F
Visibility: 9 Miles
Pressure: 30.06 in.
Flight Rule: VFR
Wind Data
5 MPH
010° North
Cloud Level(s): Solid Overcast at 10000ft
Mostly Cloudy on Overnight Overnight... Mostly cloudy, with a steady temperature around 25. Calm wind becoming east around 5 mph.
Partly Sunny on Friday Friday... Partly sunny, with a high near 30. East northeast wind 5 to 10 mph becoming west in the afternoon.
Cloudy on Friday Night Friday Night... Cloudy, with a low around 8. Wind chill values as low as -4. West wind 10 to 15 mph, with gusts as high as 25 mph.
80% chance of snow Saturday Saturday... Snow, mainly after 9am. High near 13. Wind chill values as low as -6. Northwest wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%. New snow accumulation of 1 to 2 inches possible.
Cloudy on Saturday Night Saturday Night... Partly cloudy, with a low around -4. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.
Sunny on Sunday Sunday... Sunny and cold, with a high near 9.
Cloudy on Sunday Night Sunday Night... Partly cloudy, with a low around -2.
Partly Sunny on Monday Monday... Partly sunny, with a high near 22.
Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 14.
Partly Sunny on Tuesday Tuesday... Partly sunny, with a high near 36.
Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 30.
Mostly Cloudy on Wednesday Wednesday... Mostly cloudy, with a high near 45.
20% chance of rain Wednesday Night Wednesday Night... A chance of rain. Mostly cloudy, with a low around 36.
20% chance of rain Thursday Thursday... A chance of rain. Partly sunny, with a high near 46.
Current Radar Image


Sun Almanac for Union, Illinois
Sunrise: 07:10 AM
Sunset: 4:22 PM
Civil Sunrise:06:38 AM
Civil Sunset: 4:54 PM
Nautical Sunrise: 06:03 AM
Nautical Sunset: 5:29 PM
Astro Sunrise: 05:30 AM
Astro Sunset: 6:02 PM
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