Union, California Weather
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Weather Forecast for Union, California : Napa County
Issued: 1:26 pm PDT Jul 1, 2025 Latitude: 38.3213027 Longitude: -122.3099749 View on Google Maps

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Tonight Wednesday Thursday Independence Day Saturday Sunday Monday Tuesday
Increasing Clouds on Tonight Clearing on Wednesday Partly Sunny on Thursday Sunny on Independence Day Sunny on Saturday Sunny on Sunday Patchy Fog on Monday Patchy Fog on Tuesday
Low: 56°F High: 81°F High: 82°F High: 77°F High: 82°F High: 81°F High: 79°F High: 78°F
Low: 54°F Low: 54°F Low: 52°F Low: 53°F Low: 53°F Low: 53°F  
Increasing Clouds Clearing Partly Sunny Sunny Sunny Sunny Patchy Fog Patchy Fog
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Increasing Clouds on Tonight Tonight... Increasing clouds, with a low around 56. South southwest wind 6 to 11 mph.
Clearing on Wednesday Wednesday... Mostly cloudy through mid morning, then gradual clearing, with a high near 81. South wind 6 to 11 mph.
Mostly Clear on Wednesday Night Wednesday Night... Mostly clear, with a low around 54. South wind 5 to 10 mph.
Partly Sunny on Thursday Thursday... Partly sunny, with a high near 82. South wind 5 to 10 mph increasing to 11 to 16 mph in the afternoon. Winds could gust as high as 20 mph.
Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 54. West northwest wind 9 to 14 mph becoming light west southwest after midnight.
Sunny on Independence Day Independence Day... Sunny, with a high near 77.
Mostly Clear on Friday Night Friday Night... Mostly clear, with a low around 52.
Sunny on Saturday Saturday... Sunny, with a high near 82.
Mostly Clear on Saturday Night Saturday Night... Mostly clear, with a low around 53.
Sunny on Sunday Sunday... Sunny, with a high near 81.
Patchy Fog on Sunday Night Sunday Night... Patchy fog. Otherwise, mostly clear, with a low around 53.
Patchy Fog on Monday Monday... Patchy fog. Otherwise, mostly sunny, with a high near 79.
Patchy Fog on Monday Night Monday Night... Patchy fog. Otherwise, partly cloudy, with a low around 53.
Patchy Fog on Tuesday Tuesday... Patchy fog. Otherwise, mostly sunny, with a high near 78.
Sun Almanac for Union, California
Sunrise: 05:50 AM
Sunset: 8:37 PM
Civil Sunrise:05:18 AM
Civil Sunset: 9:08 PM
Nautical Sunrise: 04:39 AM
Nautical Sunset: 9:48 PM
Astro Sunrise: 03:54 AM
Astro Sunset: 10:33 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.