Union, Illinois Weather
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Weather Forecast for Union, Illinois : Will County
Issued: 4:11 pm CDT Oct 20, 2025 Latitude: 41.4969757 Longitude: -88.0233891 View on Google Maps

MouseOver for Detail Forecast
Tonight Tuesday Wednesday Thursday Friday Saturday Sunday Monday
70% chance of rain on Tonight 20% chance of rain on Tuesday Partly Sunny on Wednesday Sunny on Thursday Mostly Sunny on Friday 20% chance of on Saturday Mostly Cloudy on Sunday 20% chance of on Monday
Low: 46°F High: 56°F High: 54°F High: 56°F High: 59°F High: 60°F High: 62°F High: 66°F
Low: 44°F Low: 36°F Low: 35°F Low: 43°F Low: 47°F Low: 49°F  
Rain Rain Partly Sunny Sunny Mostly Sunny Partly Sunny Mostly Cloudy Partly Sunny
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Current Conditions at
JOLIET - (KJOT)
63°
Cloudy
as of 7:35 PM CDST
Rel. Humidity: 45%
Dew Point: 41°F
Visibility: 10 Miles
Pressure: 29.76 in.
Flight Rule: VFR
Wind Data
12 MPH
Gust: 17 MPH
180° South
Cloud Level(s): Solid Overcast at 8000ft
Current Conditions at
ROMEOVILLE WFO - (KLOT)
61°
Clear
as of 6:45 PM CDST
Rel. Humidity: 44%
Dew Point: 39°F
Visibility: 10 Miles
Pressure: 29.76 in.
Flight Rule: VFR
Wind Data
13 MPH
Gust: 18 MPH
170° South
Cloud Level(s): Clear
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
61°
Cloudy
as of 7:35 PM CDST
Rel. Humidity: 55%
Dew Point: 45°F
Visibility: 10 Miles
Pressure: 29.73 in.
Flight Rule: VFR
Wind Data
10 MPH
Gust: 18 MPH
170° South
Cloud Level(s): Solid Overcast at 8000ft
Current Conditions at
CHICAGO-MIDWAY - (KMDW)
61°
Mostly Clear
as of 6:53 PM CDST
Rel. Humidity: 38%
Dew Point: 36°F
Visibility: 10 Miles
Pressure: 29.76 in.
Flight Rule: VFR
Wind Data
13 MPH
190° South
Cloud Level(s): Few at 7000ft
70% chance of rain Tonight Tonight... Showers likely, mainly before 1am. Cloudy during the early evening, then gradual clearing, with a low around 46. South wind around 15 mph becoming west after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
20% chance of rain Tuesday Tuesday... A 20 percent chance of showers after 10am. Increasing clouds, with a high near 56. Breezy, with a west wind 10 to 15 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 40 mph.
20% chance of rain Tuesday Night Tuesday Night... A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 44. Breezy, with a west wind around 20 mph, with gusts as high as 35 mph.
Partly Sunny on Wednesday Wednesday... Partly sunny, with a high near 54. Breezy, with a west northwest wind 15 to 20 mph, with gusts as high as 30 mph.
Mostly Clear on Wednesday Night Wednesday Night... Mostly clear, with a low around 36. West northwest wind around 10 mph, with gusts as high as 20 mph.
Sunny on Thursday Thursday... Sunny, with a high near 56.
Mostly Clear on Thursday Night Thursday Night... Areas of frost after 4am. Otherwise, mostly clear, with a low around 35.
Mostly Sunny on Friday Friday... Areas of frost before 8am. Otherwise, mostly sunny, with a high near 59.
Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 43.
20% chance of Saturday Saturday... A chance of showers after 1pm. Partly sunny, with a high near 60.
20% chance of rain Saturday Night Saturday Night... A chance of showers. Mostly cloudy, with a low around 47.
Mostly Cloudy on Sunday Sunday... Mostly cloudy, with a high near 62.
Mostly Cloudy on Sunday Night Sunday Night... Mostly cloudy, with a low around 49.
20% chance of Monday Monday... A chance of showers. Partly sunny, with a high near 66.
Current Radar Image


Sun Almanac for Union, Illinois
Sunrise: 07:10 AM
Sunset: 6:03 PM
Civil Sunrise:06:42 AM
Civil Sunset: 6:31 PM
Nautical Sunrise: 06:10 AM
Nautical Sunset: 7:04 PM
Astro Sunrise: 05:38 AM
Astro Sunset: 7:36 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.