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Union, Illinois Weather Forecast
Union, Illinois Weather
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Weather Forecast for Union, Illinois : Will County
Issued: 9:31 pm CST Jan 8, 2026 Latitude: 41.4969757 Longitude: -88.0233891 View on Google Maps

MouseOver for Detail Forecast
Tonight Friday Saturday Sunday Monday Tuesday Wednesday Thursday
80% chance of thunderstorms on Tonight 30% chance of rain on Friday 60% chance of rain & snow on Saturday Partly Sunny on Sunday Mostly Sunny on Monday Mostly Cloudy on Tuesday 20% chance of rain & snow on Wednesday Partly Sunny on Thursday
Low: 43°F High: 42 °F High: 38°F High: 31°F High: 40°F High: 44°F High: 35°F High: 29°F
Low: 32°F Low: 20°F Low: 23°F Low: 32°F Low: 30°F Low: 20°F  
Thunderstorms Rain Rain & Snow Partly Sunny Mostly Sunny Mostly Cloudy Rain & Snow Partly Sunny
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Current Conditions at
JOLIET - (KJOT)
61°
Clear
as of 10:35 PM CST
Rel. Humidity: 93%
Dew Point: 59°F
Visibility: 10 Miles
Pressure: 29.43 in.
Flight Rule: VFR
Wind Data
12 MPH
Gust: 24 MPH
210° Southwest
Cloud Level(s): Clear
Current Conditions at
ROMEOVILLE WFO - (KLOT)
61°
Mostly Clear
as of 10:35 PM CST
Rel. Humidity: 87%
Dew Point: 57°F
Visibility: 10 Miles
Pressure: 29.43 in.
Flight Rule: VFR
Wind Data
21 MPH
Gust: 29 MPH
200° South
Cloud Level(s): Few at 8500ft
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
61°
Clear
as of 10:35 PM CST
Rel. Humidity: 82%
Dew Point: 55°F
Visibility: 10 Miles
Pressure: 29.41 in.
Flight Rule: VFR
Wind Data
20 MPH
Gust: 28 MPH
220° Southwest
Cloud Level(s): Clear
Current Conditions at
CHICAGO-MIDWAY - (KMDW)
59°
Cloudy
Light Rain
as of 10:03 PM CST
Rel. Humidity: 87%
Dew Point: 55°F
Visibility: 9 Miles
Pressure: 29.43 in.
Flight Rule: VFR
Wind Data
18 MPH
Gust: 39 MPH
220° Southwest
Cloud Level(s): Broken at 4800ft, Solid Overcast at 7000ft
80% chance of thunderstorms Tonight Tonight... Rain and possibly a thunderstorm before 11pm, then a slight chance of rain between 11pm and 3am, then a slight chance of showers after 3am. Low around 43. Breezy, with a south southwest wind 20 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

30% chance of rain Friday Friday... A 30 percent chance of showers, mainly before 9am. Mostly cloudy, with a temperature falling to around 42 by 5pm. Breezy, with a west southwest wind 15 to 25 mph becoming north 5 to 10 mph in the afternoon. Winds could gust as high as 40 mph.

Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 32. North wind around 5 mph becoming calm.

60% chance of rain & snow Saturday Saturday... Rain and snow likely, mainly before noon. Mostly cloudy, with a high near 38. South wind 5 to 10 mph becoming west 10 to 15 mph in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

40% chance of snow Saturday Night Saturday Night... A 40 percent chance of snow. Mostly cloudy, with a low around 20. Breezy, with a west wind 15 to 20 mph, with gusts as high as 25 mph.

Partly Sunny on Sunday Sunday... Partly sunny, with a high near 31.

Cloudy on Sunday Night Sunday Night... Partly cloudy, with a low around 23.

Mostly Sunny on Monday Monday... Mostly sunny, with a high near 40.

Mostly Cloudy on Monday Night Monday Night... Mostly cloudy, with a low around 32.

Mostly Cloudy on Tuesday Tuesday... Mostly cloudy, with a high near 44.

20% chance of rain Tuesday Night Tuesday Night... A chance of rain. Cloudy, with a low around 30.

20% chance of rain & snow Wednesday Wednesday... A chance of rain and snow. Mostly cloudy, with a high near 35.

Mostly Cloudy on Wednesday Night Wednesday Night... Mostly cloudy, with a low around 20.

Partly Sunny on Thursday Thursday... Partly sunny, with a high near 29.

Current Radar Image


Sun Almanac for Union, Illinois
Sunrise: 07:18 AM
Sunset: 4:40 PM
Civil Sunrise:06:47 AM
Civil Sunset: 5:10 PM
Nautical Sunrise: 06:13 AM
Nautical Sunset: 5:45 PM
Astro Sunrise: 05:39 AM
Astro Sunset: 6:18 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.