Arbor, CA
Unincorporated community in Contra Costa County, California
Arbor is a small unincorporated community in Contra Costa County, California. It is 1.8 miles S of Brentwood, the nearest town. Its ZIP code is 94561.
Arbor at a glance
- State
- California
- County
- Contra Costa County
- ZIP code
- 94561
- Nearest town
- Brentwood (1.8 mi)
- Time zone
- America/Los Angeles
- Coordinates
- 37.9617, -121.7222
Weather in Arbor now
Loading the National Weather Service forecast…
Arbor weather by the hour
Arbor weather for the next 7 days
Source: National Weather Service (NOAA) · forecast for the coordinates of Arbor.
This week in Arbor
Sunrise, sunset and moon in Arbor
What is the weather usually like in Arbor?
Köppen climate classification, calculated from the 1991–2020 normals
- Julywarmest month · 91°F average high
- Januarycoldest month · 40°F average low
- 12.6 inprecipitation per year · 320 mm
Average high and low temperature (°F)
Average precipitation (inches)
Best time to visit Arbor: April to June and October, with mild temperatures and fewer rainy days.
Source: NOAA NCEI U.S. Climate Normals 1991–2020, station ANTIOCH PUMPING PLT #3, CA US (USC00040232), adjusted for the elevation of Arbor.
Arbor weather month by month
Sunrise and sunset in Arbor through the year
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 7:19 AM | 5:12 PM | 9 h 53 min |
| February | 6:54 AM | 5:47 PM | 10 h 52 min |
| March | 7:15 AM | 7:15 PM | 11 h 59 min |
| April | 6:29 AM | 7:44 PM | 13 h 14 min |
| May | 5:54 AM | 8:11 PM | 14 h 17 min |
| June | 5:42 AM | 8:32 PM | 14 h 50 min |
| July | 5:55 AM | 8:30 PM | 14 h 35 min |
| August | 6:21 AM | 8:01 PM | 13 h 40 min |
| September | 6:47 AM | 7:16 PM | 12 h 28 min |
| October | 7:14 AM | 6:30 PM | 11 h 16 min |
| November | 6:46 AM | 4:56 PM | 10 h 10 min |
| December | 7:14 AM | 4:50 PM | 9 h 35 min |
Times for the 15th of each month, local time (America/Los Angeles).
What is the weather like in Arbor?
Arbor has a cold semi-arid climate. The warmest month is July, with an average high of 91°F (33°C), and the coldest is January, with average lows of 40°F (5°C).
It gets about 12.6 inches (320 mm) of precipitation a year. The wettest month is January and the driest is July.
The best time to visit Arbor is April to June 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 Arbor
The closest live webcam is SR-4 · WOF LONE TREE WY, 1.1 miles NW of Arbor.
Webcams: Windy.com · Traffic cameras: Caltrans. Distances in a straight line from Arbor.
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Map of Arbor, CA
Tap any road on the map to see it in Street View below. Map: © OpenStreetMap contributors.
Arbor Street View
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Open in Google Maps ›Towns near Arbor
Other communities near Arbor
Questions about Arbor
Where is Arbor, CA?
Arbor is an unincorporated community in Contra Costa County, California, 1.8 miles S of Brentwood.
What county is Arbor in?
Arbor is in Contra Costa County, California.
What is the ZIP code of Arbor, CA?
The ZIP code for Arbor is 94561.
What is the nearest town to Arbor?
Brentwood, 1.8 miles away.
Are there webcams near Arbor?
Yes. The closest is SR-4 · WOF LONE TREE WY, 1.1 miles away.
What is the hottest month in Arbor?
July, with an average high of 91°F (33°C).
What is the coldest month in Arbor?
January, with an average low of 40°F (5°C).
How much does it rain in Arbor?
About 12.6 inches (320 mm) a year; the wettest month is January.
Does it snow in Arbor?
Snow is very rare or not recorded at the nearest weather station.
When is the best time to visit Arbor?
April to June and October, when temperatures are most pleasant and rainy days are fewer.
What climate does Arbor have?
Cold semi-arid (Köppen BSk).
Last updated: