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Union, Illinois Weather Forecast
Union, Illinois Weather
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Weather Forecast for Union, Illinois : Will County
Issued: 9:11 pm CST Jan 9, 2026 Latitude: 41.4969757 Longitude: -88.0233891 View on Google Maps

MouseOver for Detail Forecast
Tonight Saturday Sunday Monday Tuesday Wednesday Thursday Friday
30% chance of rain on Tonight 90% chance of rain & snow on Saturday Mostly Sunny on Sunday Mostly Sunny on Monday 20% chance of rain on Tuesday 20% chance of rain & snow on Wednesday Partly Sunny on Thursday 20% chance of snow on Friday
Low: 34°F High: 32 °F High: 32°F High: 41°F High: 46°F High: 34°F High: 29°F High: 34°F
Low: 21°F Low: 24°F Low: 32°F Low: 30°F Low: 18°F Low: 22°F  
Rain Rain & Snow Mostly Sunny Mostly Sunny Rain Rain & Snow Partly Sunny Snow
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Current Conditions at
JOLIET - (KJOT)
41°
Cloudy
as of 9:35 PM CST
Rel. Humidity: 86%
Dew Point: 37°F
Visibility: 10 Miles
Pressure: 30.18 in.
Flight Rule: MVFR
Wind Data
Calm
Cloud Level(s): Solid Overcast at 1800ft
Current Conditions at
ROMEOVILLE WFO - (KLOT)
41°
Cloudy
as of 9:35 PM CST
Rel. Humidity: 86%
Dew Point: 37°F
Visibility: 10 Miles
Pressure: 30.19 in.
Flight Rule: MVFR
Wind Data
Calm
Cloud Level(s): Solid Overcast at 1800ft
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
41°
Cloudy
as of 9:35 PM CST
Rel. Humidity: 86%
Dew Point: 37°F
Visibility: 10 Miles
Pressure: 30.17 in.
Flight Rule: MVFR
Wind Data
Calm
Cloud Level(s): Solid Overcast at 1700ft
Current Conditions at
CHICAGO-MIDWAY - (KMDW)
43°
Cloudy
as of 8:53 PM CST
Rel. Humidity: 70%
Dew Point: 34°F
Visibility: 10 Miles
Pressure: 30.19 in.
Flight Rule: MVFR
Wind Data
6 MPH
110° East
Cloud Level(s): Scattered at 1500ft, Solid Overcast at 2700ft
30% chance of rain Tonight Tonight... A 30 percent chance of rain, mainly after 5am. Cloudy, with a low around 34. East wind around 5 mph becoming south southwest after midnight.
90% chance of rain & snow Saturday Saturday... Rain, possibly mixed with snow showers before 10am, then rain and snow showers likely between 10am and noon, then a chance of snow showers after noon. Temperature falling to around 32 by 5pm. South southeast wind 5 to 10 mph becoming west 10 to 15 mph in the morning. Winds could gust as high as 30 mph. Chance of precipitation is 90%. Little or no snow accumulation expected.
40% chance of snow Saturday Night Saturday Night... Scattered snow showers. Mostly cloudy, with a low around 21. Blustery, with a west northwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 40%.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 32. Breezy, with a west northwest wind 10 to 20 mph, with gusts as high as 30 mph.
Cloudy on Sunday Night Sunday Night... Partly cloudy, with a low around 24. Southwest wind around 10 mph, with gusts as high as 20 mph.
Mostly Sunny on Monday Monday... Mostly sunny, with a high near 41.
Mostly Cloudy on Monday Night Monday Night... Mostly cloudy, with a low around 32.
20% chance of rain Tuesday Tuesday... A chance of rain after noon. Mostly cloudy, with a high near 46.
20% chance of rain Tuesday Night Tuesday Night... A chance of rain. Mostly cloudy, with a low around 30.
20% chance of rain & snow Wednesday Wednesday... A chance of rain and snow before noon, then a chance of snow. Mostly cloudy, with a high near 34.
Mostly Cloudy on Wednesday Night Wednesday Night... Mostly cloudy, with a low around 18.
Partly Sunny on Thursday Thursday... Partly sunny, with a high near 29.
20% chance of snow Thursday Night Thursday Night... A chance of snow. Mostly cloudy, with a low around 22.
20% chance of snow Friday Friday... A chance of snow. Mostly cloudy, with a high near 34.
Current Radar Image


Sun Almanac for Union, Illinois
Sunrise: 07:18 AM
Sunset: 4:41 PM
Civil Sunrise:06:47 AM
Civil Sunset: 5:11 PM
Nautical Sunrise: 06:13 AM
Nautical Sunset: 5:46 PM
Astro Sunrise: 05:39 AM
Astro Sunset: 6:19 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.