2025 Compare Climate & Weather:
Palo Alto, CA vs San Bruno, CA

Highlights

On average, there are 262 sunny days per year in San Bruno. Palo Alto averages 261 sunny days per year. The US average is 205 sunny days.

San Bruno, California gets 25.5 inches of rain, on average, per year. Palo Alto, California gets 17.3 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

San Bruno averages 0 inches of snow per year. Palo Alto averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

San Bruno, California
Summer High: the July high is around 69.8 degrees
Winter Low: the January low is 45.9
Rain: averages 25.5 inches of rain a year
Snow: averages 0 inches of snow a year

Palo Alto, California
Summer High: the July high is around 79.8 degrees
Winter Low: the January low is 40.5
Rain: averages 17.3 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index

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

The annual BestPlaces Comfort Index for Palo Alto is 8.8 (10=best), which means it is more comfortable than most places in California.

Today's Weather - Palo Alto, CA

66°F

Today's Weather - San Bruno, CA

58°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Palo Alto / San Bruno

July is the hottest month for Palo Alto with an average high temperature of 79.8°, which ranks it as cooler than most places in California. In Palo Alto, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Palo Alto are June, September and August.

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

December has the coldest nighttime temperatures for Palo Alto with an average of 40.2°. This is warmer than most places in California.

January has the coldest nighttime temperatures for San Bruno with an average of 45.9°. This is one of the warmest places in California.

In Palo Alto, there are 13.0 days annually when the high temperature is over 90°, which is cooler than most places in California.

In San Bruno, there are 2.6 days annually when the high temperature is over 90°, which is one of the coolest places in California.

In Palo Alto, there are 7.1 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In San Bruno, there are 0.3 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in California.

In Palo Alto, 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 Bruno, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

February is the wettest month in Palo Alto with 3.5 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 17.3 inches in Palo Alto means that it is about average compared to other places in California.


January is the wettest month in San Bruno with 5.0 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 25.5 inches in San Bruno means that it is wetter than most places in California.

January is the rainiest month in Palo Alto with 10.2 days of rain, and July is the driest month with only 0.1 rainy days. There are 60.6 rainy days annually in Palo Alto, which is about average compared to other 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.

January is the rainiest month in San Bruno with 11.2 days of rain, and July is the driest month with only 0.3 rainy days. There are 69.1 rainy days annually in San Bruno, 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.

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

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

Any measurable snowfall is a rare occurance in Palo Alto.

Any measurable snowfall is a rare occurance in San Bruno.