Foster City, CA Climate


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United States / California / San Francisco-Oakland-Berkeley Metro Area / San Mateo County / Foster City / Zip Codes
Foster City, CA enjoys a mild climate year-round, and is located in the San Francisco Bay Area. Winters are relatively mild, with temperatures rarely dipping below freezing. Summers are mild as well, with temperatures usually not reaching above 80 degrees Fahrenheit during the day. Rainfall is abundant throughout the year, making Foster City an ideal place to live for those who enjoy a temperate climate.

Foster City, California gets 19 inches of rain, on average, per year. The US average is 38 inches of rain per year.

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

On average, there are 262 sunny days per year in Foster City. The US average is 205 sunny days.

Foster City gets some kind of precipitation, on average, 62 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 78 degrees
Winter Low: the January low is 41
Rain: averages 19 inches of rain a year
Snow: averages 0 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Foster City is 8.7 (10=best), which means it is more comfortable than most places in California.

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

  ClimateFoster City, CaliforniaUnited States
  19.1 in.38.1 in.
  0.0 in.27.8 in.
  62.0 days106.2 days
  262 days205 days
  77.9°85.8°
  41.1°21.7°
  8.77
  4.94.3
  7 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 Foster City with an average high temperature of 77.9°, which ranks it as cooler than most places in California. In Foster City, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Foster City are August, July and September.
In Foster City, there are 10.7 days annually when the high temperature is over 90°, which is cooler than most places in California.
December has the coldest nighttime temperatures for Foster City with an average of 41.0°. This is warmer than most places in California.
In Foster City, there are 6.1 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.
In Foster 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 Foster 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 September.
February is the wettest month in Foster City with 3.8 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 59% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 19.1 inches in Foster City means that it is about average compared to other places in California.
January is the rainiest month in Foster City with 10.7 days of rain, and July is the driest month with only 0.1 rainy days. There are 62.0 rainy days annually in Foster City, which is rainier than most places in California. The rainiest season is Spring when it rains 50% of the time and the driest is Autumn with only a 2% chance of a rainy day.
There is rarely any recorded snowfall in Foster City, ranking it as one of the least snowy places in California. Any measurable snowfall is a rare occurance in Foster City.
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Jackie · San Mateo, CA
Great Family Town!
Over 16 years ago

Built on lagoons, great climate, good schools, lots of soccer and other sports for kids, plenty of parking and  More

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prashanth · San Mateo, CA
Foster City
Over 17 years ago

A great city to raise a family, safe, great weather around the year, good schools and plenty of recreation. But only if you can afford the hight cost of  More

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Therese · San Mateo, CA
Expensive But Worth It If You Can Afford It
Over 18 years ago

Landlords are able to command and receive high rent due to the following attributes: safety, weather and cleanliness of Foster City. The lagoon, waterways and gardens  More

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