Union City, CA Climate


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United States / California / San Francisco-Oakland-Berkeley Metro Area / Alameda County / Union City / Zip Codes
Union City, CA has a Mediterranean climate characterized by mild winters and warm summers. The average annual temperature is 61°F, with an average high of 68°F and an average low of 54°F. During the summer months, temperatures can often exceed 90°F. Rainfall averages about 19 inches per year and is distributed fairly evenly throughout the year. Union City also experiences occasional strong winds due to its location near the San Francisco Bay. On particularly windy days, gusts can reach up to 50 mph.

Union City, California gets 17 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Union City averages 0 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 265 sunny days per year in Union City. The US average is 205 sunny days.

Union City gets some kind of precipitation, on average, 64 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 76 degrees
Winter Low: the January low is 42
Rain: averages 17 inches of rain a year
Snow: averages 0 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Union City is 8.8 (10=best), which means it is more comfortable than most places in California.

9.8 Summer - 7.5 Winter
August, July and September are the most pleasant months in Union City, while January and December are the least comfortable months.

  ClimateUnion City, CaliforniaUnited States
  16.6 in.38.1 in.
  0.0 in.27.8 in.
  64.1 days106.2 days
  265 days205 days
  76.1°85.8°
  42.3°21.7°
  8.87
  5.44.3
  66 ft.2443 ft.
Climate
YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

August is the hottest month for Union City with an average high temperature of 77.3°, which ranks it as cooler than most places in California. In Union City, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Union City are August, September and July.
In Union City, there are 7.8 days annually when the high temperature is over 90°, which is cooler than most places in California.
January has the coldest nighttime temperatures for Union City with an average of 42.3°. This is warmer than most places in California.
In Union City, there are 1.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.
In Union City, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.
Humidity in Union City is generally quite low and comfortable. There are few days during the summer when the humidity becomes unpleasant. The most humid months (but still comfortable) are August, July and June.
February is the wettest month in Union City with 3.2 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 55% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 16.6 inches in Union City means that it is about average compared to other places in California.
December is the rainiest month in Union City with 11.4 days of rain, and July is the driest month with only 0.1 rainy days. There are 64.1 rainy days annually in Union City, which is rainier than most places in California. The rainiest season is Spring when it rains 51% of the time and the driest is Autumn with only a 2% chance of a rainy day.
There is rarely any recorded snowfall in Union City, ranking it as one of the least snowy places in California. Any measurable snowfall is a rare occurance in Union City.
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Miriam · Union City, CA
hello from Union City
Over 18 years ago

Hi, I am looking for a small, friendly town with low crime and friendly people, outdoor activites, mellow, etc. (in the bay area). I am currently hoping to move to  More

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