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

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Highlights

On average, there are 259 sunny days per year in South San Francisco. Millbrae averages 262 sunny days per year. The US average is 205 sunny days.

South San Francisco, California gets 21.7 inches of rain, on average, per year. Millbrae, California gets 25.3 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

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

Weather Highlights

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

Millbrae, California
Summer High: the July high is around 69.8 degrees
Winter Low: the January low is 45.8
Rain: averages 25.3 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index

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.

Millbrae

The annual BestPlaces Comfort Index for Millbrae is 8.6 (10=best), which means it is more comfortable than most places in California.

8.6 / 10

August, September and July are the most pleasant months in Millbrae, while January and December are the least comfortable months.

Average Monthly High / Low (°F)

Month	Millbrae, CA	South San Francisco, CA
January	57° / 46°	57° / 45°
February	60° / 47°	59° / 47°
March	62° / 48°	61° / 48°
April	64° / 49°	62° / 49°
May	66° / 51°	64° / 51°
June	69° / 53°	66° / 53°
July	70° / 55°	67° / 55°
August	71° / 56°	68° / 56°
September	72° / 56°	69° / 55°
October	70° / 54°	68° / 53°
November	63° / 50°	63° / 49°
December	57° / 46°	57° / 45°

Hot, Freezing, Rainy, Snowy Days: Millbrae / South San Francisco

Month	Hot Days	Freezing Days	Rainy Days	Snowy Days
January	0 / 0	0 / 0	11 / 11	0 / 0
February	0 / 0	0 / 0	11 / 11	0 / 0
March	0 / 0	0 / 0	10 / 10	0 / 0
April	0 / 0	0 / 0	6 / 6	0 / 0
May	0 / 0	0 / 0	4 / 4	0 / 0
June	1 / 0	0 / 0	1 / 1	0 / 0
July	0 / 0	0 / 0	0 / 0	0 / 0
August	0 / 0	0 / 0	1 / 1	0 / 0
September	1 / 1	0 / 0	2 / 1	0 / 0
October	0 / 0	0 / 0	4 / 3	0 / 0
November	0 / 0	0 / 0	8 / 8	0 / 0
December	0 / 0	0 / 0	11 / 11	0 / 0

September is the hottest month for Millbrae with an average high temperature of 72.1°, which ranks it as one of the coolest places in California. In Millbrae, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Millbrae are September, August and July.

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.

January has the coldest nighttime temperatures for Millbrae with an average of 45.8°. This is one of the warmest places in California.

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.

In Millbrae, there are 2.6 days annually when the high temperature is over 90°, which is one of the coolest 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 Millbrae, there are 0.3 days annually when the nighttime low temperature falls below freezing, which is one of the warmest 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 Millbrae, 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 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.

December is the wettest month in Millbrae with 4.9 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 25.3 inches in Millbrae means that it is wetter than most 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 rainiest month in Millbrae with 11.2 days of rain, and July is the driest month with only 0.3 rainy days. There are 69.2 rainy days annually in Millbrae, which is rainier than most places in California. The rainiest season is Spring when it rains 48% of the time and the driest is Autumn with only a 4% chance of a rainy day.

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.

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

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

Any measurable snowfall is a rare occurance in Millbrae.

Any measurable snowfall is a rare occurance in South San Francisco.

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 Millbrae 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

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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

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

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Millbrae / South San Francisco

January has the coldest nighttime temperatures for Millbrae with an average of 45.8°. This is one of the warmest places in California.

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.

In Millbrae, there are 2.6 days annually when the high temperature is over 90°, which is one of the coolest 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.

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

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

Any measurable snowfall is a rare occurance in Millbrae.

Any measurable snowfall is a rare occurance in South San Francisco.

DID YOU KNOW?

Reviews for Millbrae 2 Reviews

Reviews for South San Francisco 2 Reviews

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Zips In Millbrae, California

Zips In SOUTH SAN FRANCISCO, CALIFORNIA

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Learn More About South San Francisco, California

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

Highlights

Weather Highlights

BestPlaces Comfort Index

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Millbrae / South San Francisco

January has the coldest nighttime temperatures for Millbrae with an average of 45.8°. This is one of the warmest places in California.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.

In Millbrae, there are 2.6 days annually when the high temperature is over 90°, which is one of the coolest 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.

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

Any measurable snowfall is a rare occurance in Millbrae.Any measurable snowfall is a rare occurance in South San Francisco.

DID YOU KNOW?

Reviews for Millbrae 2 Reviews

Reviews for South San Francisco 2 Reviews

Most Recent Searches On Compare Climate & Weather

Compare Cost of Living

Zips In Millbrae, California

Zips In SOUTH SAN FRANCISCO, CALIFORNIA

Learn More About MILLBRAE, CALIFORNIA

Learn More About South San Francisco, California

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BestPlaces Tools

About BestPlaces

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

January has the coldest nighttime temperatures for Millbrae with an average of 45.8°. This is one of the warmest places in California.

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.

In Millbrae, there are 2.6 days annually when the high temperature is over 90°, which is one of the coolest 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.

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

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

Any measurable snowfall is a rare occurance in Millbrae.

Any measurable snowfall is a rare occurance in South San Francisco.