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Union, Illinois Weather Forecast
Union, Illinois Weather
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Weather Forecast for Union, Illinois : Will County
Issued: 3:11 am CST Dec 28, 2025 Latitude: 41.4969757 Longitude: -88.0233891 View on Google Maps

MouseOver for Detail Forecast
Overnight Sunday Monday Tuesday Wednesday New Year's Day Friday Saturday
60% chance of rain on Overnight 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 Mostly Sunny on Saturday
Low: 53°F High: 66°F High: 24°F High: 29°F High: 32°F High: 21°F High: 28°F High: 35°F
Low: 18°F Low: 13°F Low: 24°F Low: 17°F Low: 10°F Low: 20°F  
Rain Thunderstorms Snow Partly Sunny Mostly Cloudy Mostly Sunny Mostly Sunny Mostly Sunny
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Current Conditions at
JOLIET - (KJOT)
52°
Cloudy
Light Rain
as of 3:15 AM CST
Rel. Humidity: 100%
Dew Point: 52°F
Visibility: 1/2 Miles
Pressure: 29.72 in.
Flight Rule: LIFR
Wind Data
5 MPH
140° Southeast
Cloud Level(s): Solid Overcast at 200ft
Current Conditions at
ROMEOVILLE WFO - (KLOT)
50°
Cloudy
Fog
as of 3:10 AM CST
Rel. Humidity: 100%
Dew Point: 50°F
Visibility: 1/4 Miles
Pressure: 29.72 in.
Flight Rule: LIFR
Wind Data
6 MPH
160° South
Cloud Level(s): Solid Overcast at 100ft
Current Conditions at
MORRIS MUNICIPAL AIRPORT - (KC09)
52°
Cloudy
Light Rain
as of 3:35 AM CST
Rel. Humidity: 100%
Dew Point: 52°F
Visibility: 1/4 Miles
Pressure: 29.69 in.
Flight Rule: LIFR
Wind Data
5 MPH
140° Southeast
Cloud Level(s): Solid Overcast at 200ft
Current Conditions at
CHICAGO-MIDWAY - (KMDW)
46°
Mostly Cloudy
Drizzle Fog
as of 2:53 AM CST
Rel. Humidity: 100%
Dew Point: 46°F
Visibility: 1/2 Miles
Pressure: 29.72 in.
Flight Rule: IFR
Wind Data
5 MPH
120° Southeast
60% chance of rain Overnight Overnight... Showers likely, mainly after 4am. Areas of fog. Otherwise, cloudy, with a steady temperature around 53. South wind around 5 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, mainly before 5pm, then a slight chance of showers and thunderstorms after 5pm. Areas of fog before noon. Steady temperature around 57. Breezy, with a south southeast wind 5 to 10 mph becoming west 15 to 25 mph in the afternoon. Winds could gust as high as 35 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

40% chance of snow Sunday Night Sunday Night... A 40 percent chance of snow showers, mainly after 3am. Cloudy, with a low around 18. Wind chill values as low as -2. Very windy, with a west wind 25 to 35 mph, with gusts as high as 50 mph.

40% chance of snow Monday Monday... A 40 percent chance of snow showers before noon. Mostly cloudy, with a high near 24. Wind chill values as low as -2. 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 13. 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 29.

Mostly Cloudy on Tuesday Night Tuesday Night... Mostly cloudy, with a low around 24.

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 17.

Mostly Sunny on New Year's Day New Year's Day... Mostly sunny, with a high near 21.

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 28.

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

Mostly Sunny on Saturday Saturday... Mostly sunny, with a high near 35.

Current Radar Image


Sun Almanac for Union, Illinois
Sunrise: 07:18 AM
Sunset: 4:30 PM
Civil Sunrise:06:47 AM
Civil Sunset: 5:01 PM
Nautical Sunrise: 06:12 AM
Nautical Sunset: 5:36 PM
Astro Sunrise: 05:38 AM
Astro Sunset: 6:10 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.