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

2025 Compare Climate & Weather:
South San Francisco, CA vs San Mateo, CA

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Highlights

On average, there are 265 sunny days per year in San Mateo. South San Francisco averages 259 sunny days per year. The US average is 205 sunny days.

San Mateo, California gets 24.4 inches of rain, on average, per year. South San Francisco, California gets 21.7 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

San Mateo averages 0 inches of snow per year. South San Francisco averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

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

South San Francisco, California
Summer High: the July high is around 66.7 degrees
Winter Low: the January low is 45
Rain: averages 21.7 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index
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.

South San Francisco

The annual BestPlaces Comfort Index for South San Francisco is 8.4 (10=best), which means it is more comfortable than most places in California.

8.4 / 10
September, August and July are the most pleasant months in South San Francisco, while January and December are the least comfortable months.

Average Monthly High / Low (°F)
MonthSouth San Francisco, CASan Mateo, CA
January57° / 45°58° / 42°
February59° / 47°61° / 44°
March61° / 48°63° / 45°
April62° / 49°65° / 47°
May64° / 51°68° / 50°
June66° / 53°72° / 52°
July67° / 55°74° / 54°
August68° / 56°75° / 55°
September69° / 55°74° / 53°
October68° / 53°71° / 50°
November63° / 49°64° / 46°
December57° / 45°58° / 42°
Hot, Freezing, Rainy, Snowy Days: South San Francisco / San Mateo
MonthHot DaysFreezing DaysRainy DaysSnowy Days
January0 / 00 / 211 / 120 / 0
February0 / 00 / 111 / 110 / 0
March0 / 00 / 010 / 110 / 0
April0 / 00 / 06 / 70 / 0
May0 / 10 / 04 / 40 / 0
June0 / 20 / 01 / 20 / 0
July0 / 20 / 00 / 20 / 0
August0 / 20 / 01 / 20 / 0
September1 / 20 / 01 / 30 / 0
October0 / 10 / 03 / 50 / 0
November0 / 00 / 08 / 90 / 0
December0 / 00 / 211 / 110 / 0
September is the hottest month for South San Francisco with an average high temperature of 69.3°, which ranks it as one of the coolest places in California. In South San Francisco, there are 0 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for South San Francisco are September, October and August.

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.
January has the coldest nighttime temperatures for South San Francisco with an average of 45.0°. This is one of the warmest places in California.

January has the coldest nighttime temperatures for San Mateo with an average of 42.2°. This is warmer than most places in California.

In South San Francisco, there are 1.8 days annually when the high temperature is over 90°, which is one of the coolest 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 South San Francisco, there are 0.3 days annually when the nighttime low temperature falls below freezing, which is one of the warmest 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 South San Francisco, 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 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.

January is the wettest month in South San Francisco with 4.3 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 58% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 21.7 inches in South San Francisco means that it is wetter than most 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.

December is the rainiest month in South San Francisco with 11.4 days of rain, and July is the driest month with only 0.2 rainy days. There are 68.4 rainy days annually in South San Francisco, 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 3% chance of a rainy day.

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.

There is rarely any recorded snowfall in South San Francisco, ranking it as one of the least snowy places in California.

There is rarely any recorded snowfall in San Mateo, ranking it as one of the least snowy places in California.
Any measurable snowfall is a rare occurance in South San Francisco.

Any measurable snowfall is a rare occurance in San Mateo.

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 South San Francisco    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 South San Francisco

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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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Zips In South San Francisco, California
94080, 94128
Zips In SAN MATEO, CALIFORNIA
94403, 94401, 94402
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