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Union, Illinois Weather Forecast
Union, Illinois Weather
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Weather Forecast for Union, Illinois : Will County
Issued: 3:31 pm CST Dec 27, 2025 Latitude: 41.4969757 Longitude: -88.0233891 View on Google Maps

MouseOver for Detail Forecast
Tonight Sunday Monday Tuesday Wednesday New Year's Day Friday Saturday
60% chance of rain on Tonight 100% chance of thunderstorms on Sunday 40% chance of snow on Monday Partly Sunny on Tuesday Mostly Cloudy on Wednesday Mostly Sunny on New Year's Day Mostly Sunny on Friday Partly Sunny on Saturday
Low: 52 °F High: 58°F High: 24°F High: 27°F High: 32°F High: 23°F High: 26°F High: 34°F
Low: 16°F Low: 12°F Low: 23°F Low: 15°F Low: 10°F Low: 18°F  
Rain Thunderstorms Snow Partly Sunny Mostly Cloudy Mostly Sunny Mostly Sunny Partly Sunny
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Current Conditions at
JOLIET - (KJOT)
45°
Cloudy
Mist
as of 8:15 PM CST
Rel. Humidity: 100%
Dew Point: 45°F
Visibility: 5 Miles
Pressure: 29.84 in.
Flight Rule: LIFR
Wind Data
7 MPH
110° East
Cloud Level(s): Solid Overcast at 400ft
Current Conditions at
ROMEOVILLE WFO - (KLOT)
43°
Feels like 36°F
Cloudy
Mist
as of 8:15 PM CST
Rel. Humidity: 100%
Dew Point: 43°F
Visibility: 5 Miles
Pressure: 29.84 in.
Flight Rule: IFR
Wind Data
10 MPH
110° East
Cloud Level(s): Solid Overcast at 500ft
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
45°
Feels like 39°F
Cloudy
Mist
as of 8:15 PM CST
Rel. Humidity: 100%
Dew Point: 45°F
Visibility: 5 Miles
Pressure: 29.81 in.
Flight Rule: MVFR
Wind Data
10 MPH
120° Southeast
Cloud Level(s): Solid Overcast at 1100ft
Current Conditions at
CHICAGO-MIDWAY - (KMDW)
43°
Cloudy
as of 7:53 PM CST
Rel. Humidity: 86%
Dew Point: 39°F
Visibility: 7 Miles
Pressure: 29.87 in.
Flight Rule: IFR
Wind Data
8 MPH
130° Southeast
Cloud Level(s): Solid Overcast at 600ft
60% chance of rain Tonight Tonight... Rain likely, mainly after 3am. Patchy fog after midnight. Otherwise, cloudy, with a temperature rising to around 52 by 4am. South wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

100% chance of thunderstorms Sunday Sunday... Rain and possibly a thunderstorm. Patchy fog before noon. High near 58. South wind 5 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.

70% chance of rain & snow Sunday Night Sunday Night... Rain likely before 8pm, then rain and snow likely between 8pm and 9pm, then snow likely after 9pm. Some thunder is also possible. Mostly cloudy, with a low around 16. Wind chill values as low as -3. Windy, with a west wind 20 to 25 mph increasing to 25 to 30 mph after midnight. Winds could gust as high as 45 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

40% chance of snow Monday Monday... A 40 percent chance of snow before noon. Mostly cloudy, with a high near 24. Wind chill values as low as -4. Windy, with a west northwest wind 20 to 30 mph, with gusts as high as 45 mph.

Cloudy on Monday Night Monday Night... Partly cloudy, with a low around 12. Blustery, with a west northwest wind 15 to 20 mph, with gusts as high as 30 mph.

Partly Sunny on Tuesday Tuesday... Partly sunny, with a high near 27.

Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 23.

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

20% chance of snow Wednesday Night Wednesday Night... A chance of snow before midnight. Mostly cloudy, with a low around 15.

Mostly Sunny on New Year's Day New Year's Day... Mostly sunny, with a high near 23.

Mostly Clear on Thursday Night Thursday Night... Mostly clear, with a low around 10.

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

Mostly Cloudy on Friday Night Friday Night... Mostly cloudy, with a low around 18.

Partly Sunny on Saturday Saturday... Partly sunny, with a high near 34.

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.