Union, Wisconsin Weather
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Weather Forecast for Union, Wisconsin : Rock County
Issued: 4:24 am CDT Aug 26, 2025 Latitude: 42.8244484 Longitude: -89.301784 View on Google Maps

MouseOver for Detail Forecast
Today Tonight Wednesday Thursday Friday Saturday Sunday Labor Day
Mostly Sunny on Today Mostly Clear on Tonight Sunny on Wednesday 20% chance of thunderstorms on Thursday Sunny on Friday Mostly Sunny on Saturday Mostly Sunny on Sunday Mostly Sunny on Labor Day
High: 70°F Low: 51°F High: 73°F High: 71°F High: 69°F High: 71°F High: 75°F High: 76°F
Low: 58°F Low: 47°F Low: 48°F Low: 51°F Low: 54°F  
Mostly Sunny Mostly Clear Sunny Thunderstorms Sunny Mostly Sunny Mostly Sunny Mostly Sunny
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Current Conditions at
JANESVILLE - (KJVL)
46°
Partly Cloudy
as of 5:15 AM CDST
Rel. Humidity: 93%
Dew Point: 45°F
Visibility: 10 Miles
Pressure: 30.18 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Scattered at 6500ft
Current Conditions at
MONROE - (KEFT)
52°
Clear
as of 5:35 AM CDST
Rel. Humidity: 81%
Dew Point: 46°F
Visibility: 10 Miles
Pressure: 30.19 in.
Flight Rule: VFR
Wind Data
12 MPH
290° West
Cloud Level(s): Clear
Current Conditions at
MADISON - (KMSN)
50°
Clear
as of 4:53 AM CDST
Rel. Humidity: 87%
Dew Point: 46°F
Visibility: 10 Miles
Pressure: 30.17 in.
Flight Rule: VFR
Wind Data
Calm
Cloud Level(s): Clear
Mostly Sunny on Today Today... Mostly sunny, with a high near 70. Northwest wind 5 to 10 mph.
Mostly Clear on Tonight Tonight... Mostly clear, with a low around 51. Northwest wind around 5 mph becoming calm in the evening.
Sunny on Wednesday Wednesday... Sunny, with a high near 73. Southwest wind 5 to 10 mph.
40% chance of thunderstorms Wednesday Night Wednesday Night... A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 58. Southwest wind 5 to 10 mph.
20% chance of thunderstorms Thursday Thursday... A chance of rain and thunderstorms before 1pm, then a slight chance of showers and thunderstorms between 1pm and 4pm, then a slight chance of showers after 4pm. Partly sunny, with a high near 71. West wind 5 to 10 mph becoming northeast in the afternoon. Chance of precipitation is 20%.
Mostly Clear on Thursday Night Thursday Night... Mostly clear, with a low around 47. Northeast wind 5 to 10 mph.
Sunny on Friday Friday... Sunny, with a high near 69. Northeast wind around 5 mph.
Cloudy on Friday Night Friday Night... Partly cloudy, with a low around 48. Northeast wind around 5 mph becoming calm in the evening.
Mostly Sunny on Saturday Saturday... Mostly sunny, with a high near 71.
Cloudy on Saturday Night Saturday Night... Partly cloudy, with a low around 51.
Mostly Sunny on Sunday Sunday... Mostly sunny, with a high near 75.
Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 54.
Mostly Sunny on Labor Day Labor Day... Mostly sunny, with a high near 76.
Sun Almanac for Union, Wisconsin
Sunrise: 06:16 AM
Sunset: 7:42 PM
Civil Sunrise:05:47 AM
Civil Sunset: 8:11 PM
Nautical Sunrise: 05:11 AM
Nautical Sunset: 8:47 PM
Astro Sunrise: 04:33 AM
Astro Sunset: 9:25 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.