Union, CA
Unincorporated community in Napa County, California
Union is a small unincorporated community in Napa County, California. It is 1.7 miles S of Napa, the nearest town. Its ZIP code is 94559.
Union at a glance
- State
- California
- County
- Napa County
- ZIP code
- 94559
- Nearest town
- Napa (1.7 mi)
- Time zone
- America/Los Angeles
- Coordinates
- 38.3214, -122.3089
Weather in Union now
Loading the National Weather Service forecast…
Union weather by the hour
Union weather for the next 7 days
Source: National Weather Service (NOAA) · forecast for the coordinates of Union.
This week in Union
Sunrise, sunset and moon in Union
What is the weather usually like in Union?
Köppen climate classification, calculated from the 1991–2020 normals
- Septemberwarmest month · 84°F average high
- Decembercoldest month · 40°F average low
- 26.7 inprecipitation per year · 677 mm
Average high and low temperature (°F)
Average precipitation (inches)
Best time to visit Union: May to July and October, with mild temperatures and fewer rainy days.
Source: NOAA NCEI U.S. Climate Normals 1991–2020, station NAPA STATE HOSPITAL, CA US (USC00046074), adjusted for the elevation of Union.
Union weather month by month
Sunrise and sunset in Union through the year
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:23 AM | 5:14 PM | 9 h 51 min |
| February | 6:57 AM | 5:48 PM | 10 h 51 min |
| March | 7:18 AM | 7:17 PM | 11 h 59 min |
| April | 6:31 AM | 7:46 PM | 13 h 15 min |
| May | 5:56 AM | 8:15 PM | 14 h 18 min |
| June | 5:43 AM | 8:36 PM | 14 h 52 min |
| July | 5:56 AM | 8:33 PM | 14 h 37 min |
| August | 6:22 AM | 8:04 PM | 13 h 41 min |
| September | 6:49 AM | 7:18 PM | 12 h 28 min |
| October | 7:17 AM | 6:32 PM | 11 h 15 min |
| November | 6:49 AM | 4:58 PM | 10 h 8 min |
| December | 7:17 AM | 4:51 PM | 9 h 33 min |
Times for the 15th of each month, local time (America/Los Angeles).
What is the weather like in Union?
Union has a warm-summer mediterranean climate. The warmest month is September, with an average high of 84°F (29°C), and the coldest is December, with average lows of 40°F (4°C).
It gets about 26.7 inches (677 mm) of precipitation a year. The wettest month is December and the driest is July.
The best time to visit Union is May to July and October. The live forecast on this page comes from the National Weather Service and the climate averages from NOAA’s 1991–2020 U.S. Climate Normals.
Webcams near Union
The closest live webcam is Napa › South: TV124 - SR-121 : SR-29 - SR-12, 4.4 miles S of Union.
Webcams: Windy.com · Traffic cameras: Caltrans. Distances in a straight line from Union.
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Map of Union, CA
Tap any road on the map to see it in Street View below. Map: © OpenStreetMap contributors.
Union Street View
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Open in Google Maps ›Towns near Union
Other communities near Union
Questions about Union
Where is Union, CA?
Union is an unincorporated community in Napa County, California, 1.7 miles S of Napa.
What county is Union in?
Union is in Napa County, California.
What is the ZIP code of Union, CA?
The ZIP code for Union is 94559.
What is the nearest town to Union?
Napa, 1.7 miles away.
Are there webcams near Union?
Yes. The closest is Napa › South: TV124 - SR-121 : SR-29 - SR-12, 4.4 miles away.
What is the hottest month in Union?
September, with an average high of 84°F (29°C).
What is the coldest month in Union?
December, with an average low of 40°F (4°C).
How much does it rain in Union?
About 26.7 inches (677 mm) a year; the wettest month is December.
Does it snow in Union?
Snow is very rare or not recorded at the nearest weather station.
When is the best time to visit Union?
May to July and October, when temperatures are most pleasant and rainy days are fewer.
What climate does Union have?
Warm-summer mediterranean (Köppen Csb).
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