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Union, Illinois Weather Forecast
Union, Illinois Weather
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Weather Forecast for Union, Illinois : Will County
Issued: 3:46 am CST Dec 27, 2025 Latitude: 41.4969757 Longitude: -88.0233891 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Sunday Monday Tuesday Wednesday New Year's Day Friday
Patchy Fog on Today 60% chance of rain on Tonight 100% chance of thunderstorms on Sunday 30% chance of snow on Monday Mostly Sunny on Tuesday Mostly Cloudy on Wednesday Mostly Sunny on New Year's Day Mostly Sunny on Friday
High: 44°F Low: 50 °F High: 60°F High: 24°F High: 28°F High: 32°F High: 19°F High: 21°F
Low: 17°F Low: 13°F Low: 22°F Low: 12°F Low: 6°F  
Patchy Fog Rain Thunderstorms Snow Mostly Sunny Mostly Cloudy Mostly Sunny Mostly Sunny
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Current Conditions at
JOLIET - (KJOT)
41°
Cloudy
as of 3:55 AM CST
Rel. Humidity: 93%
Dew Point: 39°F
Visibility: 7 Miles
Pressure: 29.99 in.
Flight Rule: MVFR
Wind Data
5 MPH
110° East
Cloud Level(s): Solid Overcast at 1000ft
Current Conditions at
ROMEOVILLE WFO - (KLOT)
39°
Cloudy
Mist
as of 3:50 AM CST
Rel. Humidity: 93%
Dew Point: 37°F
Visibility: 6 Miles
Pressure: 30.00 in.
Flight Rule: IFR
Wind Data
7 MPH
090° East
Cloud Level(s): Solid Overcast at 700ft
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
39°
Cloudy
as of 3:55 AM CST
Rel. Humidity: 100%
Dew Point: 39°F
Visibility: 10 Miles
Pressure: 29.98 in.
Flight Rule: IFR
Wind Data
Calm
Cloud Level(s): Solid Overcast at 900ft
Current Conditions at
CHICAGO-MIDWAY - (KMDW)
39°
Cloudy
as of 3:53 AM CST
Rel. Humidity: 86%
Dew Point: 36°F
Visibility: 8 Miles
Pressure: 30.00 in.
Flight Rule: MVFR
Wind Data
3 MPH
110° East
Cloud Level(s): Solid Overcast at 1000ft
Patchy Fog on Today Today... Patchy fog before noon. Otherwise, cloudy, with a high near 44. Southeast wind 5 to 10 mph, with gusts as high as 15 mph.

60% chance of rain Tonight Tonight... Showers likely, mainly after 3am. Patchy fog after midnight. Otherwise, cloudy, with a temperature rising to around 50 by 3am. Southeast wind 5 to 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

100% chance of thunderstorms Sunday Sunday... Showers and possibly a thunderstorm. Patchy fog before noon. High near 60. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

60% chance of rain & snow Sunday Night Sunday Night... Rain showers likely before 9pm, then rain and snow showers likely between 9pm and midnight, then a chance of snow showers after midnight. Cloudy, with a low around 17. Wind chill values as low as zero. Windy, with a west wind 20 to 30 mph, with gusts as high as 45 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

30% chance of snow Monday Monday... A 30 percent chance of snow showers before noon. Mostly cloudy, with a high near 24. Windy, with a west wind 25 to 30 mph, with gusts as high as 45 mph.

Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 13. Blustery.

Mostly Sunny on Tuesday Tuesday... Mostly sunny, with a high near 28.

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

Mostly Cloudy on Wednesday Wednesday... Mostly cloudy, with a high near 32.

Mostly Cloudy on Wednesday Night Wednesday Night... Mostly cloudy, with a low around 12.

Mostly Sunny on New Year's Day New Year's Day... Mostly sunny, with a high near 19.

Mostly Clear on Thursday Night Thursday Night... Mostly clear, with a low around 6.

Mostly Sunny on Friday Friday... Mostly sunny, with a high near 21.

Current Radar Image


Sun Almanac for Union, Illinois
Sunrise: 07:18 AM
Sunset: 4:29 PM
Civil Sunrise:06:46 AM
Civil Sunset: 5:00 PM
Nautical Sunrise: 06:11 AM
Nautical Sunset: 5:35 PM
Astro Sunrise: 05:38 AM
Astro Sunset: 6:09 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.