The remote server returned an error: (400) Bad Request.The remote server returned an error: (400) Bad Request. 2025 Compare Climate & Weather: Portola Valley, CA vs Portola, CA

2025 Compare Climate & Weather:
Portola Valley, CA vs Portola, CA

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Highlights

On average, there are 243 sunny days per year in Portola. Portola Valley averages 262 sunny days per year. The US average is 205 sunny days.

Portola, California gets 17.6 inches of rain, on average, per year. Portola Valley, California gets 30.7 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Portola averages 37.6 inches of snow per year. Portola Valley averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Portola, California
Summer High: the July high is around 84.8 degrees
Winter Low: the January low is 18.1
Rain: averages 17.6 inches of rain a year
Snow: averages 37.6 inches of snow a year

Portola Valley, California
Summer High: the July high is around 77.2 degrees
Winter Low: the January low is 40.8
Rain: averages 30.7 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index
Portola

The annual BestPlaces Comfort Index for Portola is 7.1 (10=best), which means it is one of the least comfortable places in California.

7.1 / 10
July, June and September are the most pleasant months in Portola, while December and January are the least comfortable months.

Portola Valley

The annual BestPlaces Comfort Index for Portola Valley 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 Portola Valley, while January and December are the least comfortable months.

Average Monthly High / Low (°F)
MonthPortola Valley, CAPortola, CA
January59° / 41°42° / 18°
February61° / 42°45° / 20°
March64° / 43°52° / 26°
April67° / 44°58° / 29°
May70° / 47°67° / 34°
June74° / 50°76° / 40°
July77° / 52°85° / 44°
August78° / 52°84° / 42°
September77° / 51°78° / 37°
October73° / 48°66° / 30°
November64° / 44°52° / 24°
December59° / 41°42° / 18°
Hot, Freezing, Rainy, Snowy Days: Portola Valley / Portola
MonthHot DaysFreezing DaysRainy DaysSnowy Days
January0 / 05 / 2911 / 80 / 3
February0 / 02 / 2611 / 80 / 3
March0 / 01 / 2710 / 80 / 2
April1 / 00 / 227 / 50 / 1
May1 / 00 / 124 / 50 / 0
June3 / 10 / 22 / 30 / 0
July5 / 60 / 11 / 10 / 0
August5 / 50 / 11 / 20 / 0
September4 / 10 / 62 / 20 / 0
October2 / 00 / 194 / 40 / 0
November0 / 02 / 268 / 60 / 1
December0 / 05 / 2911 / 80 / 3
August is the hottest month for Portola Valley with an average high temperature of 77.6°, which ranks it as cooler than most places in California. In Portola Valley, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Portola Valley are August, September and July.

July is the hottest month for Portola with an average high temperature of 84.8°, which ranks it as cooler than most places in California. In Portola, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Portola are September, June and August.
December has the coldest nighttime temperatures for Portola Valley with an average of 40.7°. This is warmer than most places in California.

January has the coldest nighttime temperatures for Portola with an average of 18.1°. This is one of the coldest places in California.

In Portola Valley, there are 19.7 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Portola, there are 12.4 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Portola Valley, there are 14.8 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in California.

In Portola, there are 198.8 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in California.

In Portola Valley, 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 Portola, there are 3.9 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in California.

February is the wettest month in Portola Valley with 6.0 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 30.7 inches in Portola Valley means that it is wetter than most places in California.


December is the wettest month in Portola with 3.0 inches of rain, and the driest month is July with 0.3 inches. The wettest season is Spring with 49% of yearly precipitation and 7% occurs in Autumn, which is the driest season. The annual rainfall of 17.6 inches in Portola means that it is about average compared to other places in California.

February is the rainiest month in Portola Valley with 11.2 days of rain, and July is the driest month with only 1.0 rainy days. There are 72.9 rainy days annually in Portola Valley, which is rainier than most places in California. The rainiest season is Spring when it rains 45% of the time and the driest is Autumn with only a 6% chance of a rainy day.

March is the rainiest month in Portola with 7.8 days of rain, and July is the driest month with only 1.4 rainy days. There are 59.1 rainy days annually in Portola, which is about average compared to other places in California. The rainiest season is Spring when it rains 39% of the time and the driest is Autumn with only a 10% chance of a rainy day.

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

An annual snowfall of 37.6 inches in Portola means that it is one of the snowiest places in California.
Any measurable snowfall is a rare occurance in Portola Valley.

February is the snowiest month in Portola with 8.8 inches of snow, and 6 months of the year have significant snowfall.

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 Portola Valley    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 Portola Valley

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Reviews for Portola    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 Portola

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Zips In Portola Valley, California
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