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Union, Illinois Weather Forecast
Union, Illinois Weather
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Weather Forecast for Union, Illinois : Will County
Issued: 12:41 am CST Dec 31, 2025 Latitude: 41.4969757 Longitude: -88.0233891 View on Google Maps

MouseOver for Detail Forecast
Overnight Wednesday New Year's Day Friday Saturday Sunday Monday Tuesday
Cloudy on Overnight 70% chance of snow on Wednesday Mostly Sunny on New Year's Day Mostly Sunny on Friday Mostly Sunny on Saturday Partly Sunny on Sunday Partly Sunny on Monday Partly Sunny on Tuesday
Low: 26°F High: 32°F High: 22°F High: 27°F High: 26°F High: 33°F High: 35°F High: 32°F
Low: 10°F Low: 13°F Low: 14°F Low: 17°F Low: 25°F Low: 22°F  
Cloudy Snow Mostly Sunny Mostly Sunny Mostly Sunny Partly Sunny Partly Sunny Partly Sunny
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Current Conditions at
JOLIET - (KJOT)
30°
Cloudy
as of 12:55 AM CST
Rel. Humidity: 92%
Dew Point: 28°F
Visibility: 10 Miles
Pressure: 29.92 in.
Flight Rule: MVFR
Wind Data
Calm
Cloud Level(s): Solid Overcast at 1800ft
Current Conditions at
ROMEOVILLE WFO - (KLOT)
27°
Cloudy
as of 12:55 AM CST
Rel. Humidity: 100%
Dew Point: 27°F
Visibility: 10 Miles
Pressure: 29.92 in.
Flight Rule: MVFR
Wind Data
5 MPH
240° Southwest
Cloud Level(s): Solid Overcast at 1400ft
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
30°
Cloudy
as of 12:55 AM CST
Rel. Humidity: 92%
Dew Point: 28°F
Visibility: 10 Miles
Pressure: 29.92 in.
Flight Rule: MVFR
Wind Data
7 MPH
270° West
Cloud Level(s): Solid Overcast at 1900ft
Current Conditions at
CHICAGO-MIDWAY - (KMDW)
27°
Cloudy
as of 12:53 AM CST
Rel. Humidity: 92%
Dew Point: 25°F
Visibility: 9 Miles
Pressure: 29.91 in.
Flight Rule: IFR
Wind Data
7 MPH
250° West
Cloud Level(s): Solid Overcast at 900ft
Cloudy on Overnight Overnight... Cloudy, with a steady temperature around 26. West northwest wind around 10 mph.

70% chance of snow Wednesday Wednesday... Snow likely, mainly after noon. Cloudy, with a high near 32. West wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 70%. New snow accumulation of around an inch possible.

20% chance of snow Wednesday Night Wednesday Night... A 20 percent chance of snow before midnight. Cloudy during the early evening, then gradual clearing, with a low around 10. Wind chill values as low as zero. North northwest wind 5 to 15 mph, with gusts as high as 30 mph.

Mostly Sunny on New Year's Day New Year's Day... Mostly sunny, with a high near 22. Wind chill values as low as 1. Northwest wind around 5 mph, with gusts as high as 10 mph.

Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 13. Calm wind becoming southwest around 5 mph.

Mostly Sunny on Friday Friday... Mostly sunny, with a high near 27.

Cloudy on Friday Night Friday Night... Partly cloudy, with a low around 14.

Mostly Sunny on Saturday Saturday... Mostly sunny, with a high near 26.

Cloudy on Saturday Night Saturday Night... Partly cloudy, with a low around 17.

Partly Sunny on Sunday Sunday... Partly sunny, with a high near 33.

Mostly Cloudy on Sunday Night Sunday Night... Mostly cloudy, with a low around 25.

Partly Sunny on Monday Monday... Partly sunny, with a high near 35.

Mostly Cloudy on Monday Night Monday Night... Mostly cloudy, with a low around 22.

Partly Sunny on Tuesday Tuesday... Partly sunny, with a high near 32.

Current Radar Image


Sun Almanac for Union, Illinois
Sunrise: 07:18 AM
Sunset: 4:32 PM
Civil Sunrise:06:47 AM
Civil Sunset: 5:03 PM
Nautical Sunrise: 06:12 AM
Nautical Sunset: 5:38 PM
Astro Sunrise: 05:39 AM
Astro Sunset: 6:12 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.