Union, California Weather
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Weather Forecast for Union, California : Napa County
Issued: 8:54 am PDT Oct 18, 2025 Latitude: 38.3213027 Longitude: -122.3099749 View on Google Maps

MouseOver for Detail Forecast
This Afternoon Tonight Sunday Monday Tuesday Wednesday Thursday Friday
Sunny on This Afternoon Mostly Clear on Tonight Sunny on Sunday Sunny on Monday Sunny on Tuesday Morning Fog on Wednesday Fog on Thursday 10% chance of rain on Friday
High: 76°F Low: 53°F High: 76°F High: 78°F High: 76°F High: 70°F High: 70°F High: 67°F
Low: 53°F Low: 53°F Low: 52°F Low: 49°F Low: 52°F  
Sunny Mostly Clear Sunny Sunny Sunny Morning Fog Fog Rain
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Current Conditions at
NAPA - (KAPC)
73°
Clear
as of 11:29 AM PDST
Rel. Humidity: 53%
Dew Point: 55°F
Visibility: 10 Miles
Pressure: 30.04 in.
Flight Rule: VFR
Wind Data
10 MPH
100° East
Cloud Level(s): Clear
Sunny on This Afternoon This Afternoon... Sunny, with a high near 76. Southeast wind around 6 mph.
Mostly Clear on Tonight Tonight... Mostly clear, with a low around 53. West wind 5 to 8 mph becoming calm in the evening.
Sunny on Sunday Sunday... Sunny, with a high near 76. Light south wind becoming southwest 6 to 11 mph in the afternoon.
Mostly Clear on Sunday Night Sunday Night... Mostly clear, with a low around 53. Southwest wind 5 to 8 mph becoming calm.
Sunny on Monday Monday... Sunny, with a high near 78. North northwest wind around 6 mph becoming east southeast in the afternoon.
Mostly Clear on Monday Night Monday Night... Mostly clear, with a low around 53.
Sunny on Tuesday Tuesday... Sunny, with a high near 76.
Cloudy on Tuesday Night Tuesday Night... Partly cloudy, with a low around 52.
Morning Fog on Wednesday Wednesday... Patchy fog before 8am. Otherwise, mostly sunny, with a high near 70.
Patchy Fog on Wednesday Night Wednesday Night... Patchy fog after midnight. Otherwise, partly cloudy, with a low around 49.
Fog on Thursday Thursday... Areas of fog. Otherwise, mostly sunny, with a high near 70.
Cloudy on Thursday Night Thursday Night... Partly cloudy, with a low around 52.
10% chance of rain Friday Friday... A slight chance of rain. Patchy fog. Otherwise, partly sunny, with a high near 67.
Sun Almanac for Union, California
Sunrise: 07:22 AM
Sunset: 6:27 PM
Civil Sunrise:06:55 AM
Civil Sunset: 6:54 PM
Nautical Sunrise: 06:24 AM
Nautical Sunset: 7:24 PM
Astro Sunrise: 05:54 AM
Astro Sunset: 7:55 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.