The remote server returned an error: (400) Bad Request.The remote server returned an error: (400) Bad Request. 2025 Compare Climate & Weather: San Mateo, CA vs Foster City, CA

2025 Compare Climate & Weather:
San Mateo, CA vs Foster City, CA

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Highlights

On average, there are 262 sunny days per year in Foster City. San Mateo averages 265 sunny days per year. The US average is 205 sunny days.

Foster City, California gets 19.1 inches of rain, on average, per year. San Mateo, California gets 24.4 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Foster City averages 0 inches of snow per year. San Mateo averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Foster City, California
Summer High: the July high is around 77.9 degrees
Winter Low: the January low is 41.1
Rain: averages 19.1 inches of rain a year
Snow: averages 0 inches of snow a year

San Mateo, California
Summer High: the July high is around 74.1 degrees
Winter Low: the January low is 42.2
Rain: averages 24.4 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index
Foster City

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

8.7 / 10
August, July and September are the most pleasant months in Foster City, while January and December are the least comfortable months.

San Mateo

The annual BestPlaces Comfort Index for San Mateo is 8.5 (10=best), which means it is more comfortable than most places in California.

8.5 / 10
August, July and September are the most pleasant months in San Mateo, while January and December are the least comfortable months.

Average Monthly High / Low (°F)
MonthSan Mateo, CAFoster City, CA
January58° / 42°58° / 41°
February61° / 44°61° / 43°
March63° / 45°64° / 45°
April65° / 47°68° / 47°
May68° / 50°72° / 50°
June72° / 52°76° / 53°
July74° / 54°78° / 56°
August75° / 55°78° / 56°
September74° / 53°78° / 54°
October71° / 50°73° / 50°
November64° / 46°64° / 45°
December58° / 42°58° / 41°
Hot, Freezing, Rainy, Snowy Days: San Mateo / Foster City
MonthHot DaysFreezing DaysRainy DaysSnowy Days
January0 / 02 / 212 / 110 / 0
February0 / 01 / 111 / 100 / 0
March0 / 00 / 011 / 100 / 0
April0 / 00 / 07 / 50 / 0
May1 / 10 / 04 / 30 / 0
June2 / 20 / 02 / 10 / 0
July2 / 20 / 02 / 00 / 0
August2 / 20 / 02 / 00 / 0
September2 / 30 / 03 / 10 / 0
October1 / 10 / 05 / 30 / 0
November0 / 00 / 09 / 70 / 0
December0 / 02 / 311 / 100 / 0
August is the hottest month for San Mateo with an average high temperature of 74.5°, which ranks it as one of the coolest places in California. In San Mateo, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for San Mateo are August, September and July.

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.
January has the coldest nighttime temperatures for San Mateo with an average of 42.2°. This is warmer 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 San Mateo, there are 9.4 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Foster City, there are 10.7 days annually when the high temperature is over 90°, which is cooler than most places in California.

In San Mateo, there are 4.6 days annually when the nighttime low temperature falls below freezing, which 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 San Mateo, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other 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.

January is the wettest month in San Mateo with 4.8 inches of rain, and the driest month is July with 0.1 inches. The wettest season is Spring with 57% of yearly precipitation and 2% occurs in Autumn, which is the driest season. The annual rainfall of 24.4 inches in San Mateo means that it is wetter than most places in California.


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 San Mateo with 11.6 days of rain, and July is the driest month with only 1.7 rainy days. There are 76.9 rainy days annually in San Mateo, which is rainier than most places in California. The rainiest season is Spring when it rains 44% of the time and the driest is Autumn with only a 7% chance of a rainy day.

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 San Mateo, ranking it as one of the least snowy places in California.

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 San Mateo.

Any measurable snowfall is a rare occurance in Foster City.

DID YOU KNOW?

Many people confuse Weather and Climate, but they are different. Weather refers to the conditions of the atmosphere over a short period of time, while Climate refers to the conditions of the atmosphere over a long period of time.

Weather, more specifically, refers to how the atmosphere behaves and its effects on life and human activities. Most people think of Weather in terms of what can be observed: temperature, humidity, precipitation, and cloudy/sunny conditions. Weather conditions constantly change on a minute-to-minute basis.

Climate is a record of the average weather conditions for a given place over a long period of time, often referred to as Climate Normals. A 30-year period of record is a common requirement to be considered a Climate Normal.

Reviews for San Mateo    2 Reviews
Jill · Sherman Oaks, CA
re:
Over 16 years ago

Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't  More

   |    Reply
NC For Me · Apex, NC
re:
Over 16 years ago

Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but  More

   |    Reply

Start Your Review of San Mateo

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Reviews for Foster City    2 Reviews
Jill · Sherman Oaks, CA
re:
Over 16 years ago

Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't  More

   |    Reply
NC For Me · Apex, NC
re:
Over 16 years ago

Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but  More

   |    Reply

Start Your Review of Foster City

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Zips In San Mateo, California
94403, 94401, 94402
Zips In FOSTER CITY, CALIFORNIA
94404
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