2025 Compare Climate & Weather:
San Francisco, CA vs Boston, MA

Highlights

On average, there are 200 sunny days per year in Boston. San Francisco averages 259 sunny days per year. The US average is 205 sunny days.

Boston, Massachusetts gets 47.4 inches of rain, on average, per year. San Francisco, California gets 24.6 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Boston averages 48.1 inches of snow per year. San Francisco averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Boston, Massachusetts
Summer High: the July high is around 82.4 degrees
Winter Low: the January low is 19.2
Rain: averages 47.4 inches of rain a year
Snow: averages 48.1 inches of snow a year

San Francisco, California
Summer High: the July high is around 67.2 degrees
Winter Low: the January low is 45.5
Rain: averages 24.6 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Boston is 6.9 (10=best), which means it is about average compared to other places in Massachusetts.

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

Today's Weather - San Francisco, CA

51°F

Today's Weather - Boston, MA

57°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: San Francisco / Boston

September is the hottest month for San Francisco with an average high temperature of 69.9°, which ranks it as one of the coolest places in California. In San Francisco, there are 0 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for San Francisco are September, October and August.

July is the hottest month for Boston with an average high temperature of 82.4°, which ranks it as warmer than most places in Massachusetts. In Boston, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Boston are June, August and July.

January has the coldest nighttime temperatures for San Francisco with an average of 45.5°. This is one of the warmest places in California.

January has the coldest nighttime temperatures for Boston with an average of 19.2°. This is about average compared to other places in Massachusetts.

In San Francisco, there are 1.9 days annually when the high temperature is over 90°, which is one of the coolest places in California.

In Boston, there are 11.3 days annually when the high temperature is over 90°, which is hotter than most places in Massachusetts.

In 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 Boston, there are 116.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Massachusetts.

In 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 Boston, there are 1.8 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Massachusetts.

January is the wettest month in San Francisco with 4.8 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 57% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 24.6 inches in San Francisco means that it is wetter than most places in California.


March is the wettest month in Boston with 4.6 inches of rain, and the driest month is February with 3.5 inches. The wettest season is Summer with 26% of yearly precipitation and 24% occurs in Spring, which is the driest season. The annual rainfall of 47.4 inches in Boston means that it is drier than most places in Massachusetts.

December is the rainiest month in San Francisco with 11.7 days of rain, and July is the driest month with only 0.6 rainy days. There are 72.3 rainy days annually in San Francisco, 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.

May is the rainiest month in Boston with 12.4 days of rain, and September is the driest month with only 8.9 rainy days. There are 130.0 rainy days annually in Boston, which is rainier than most places in Massachusetts. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 23% chance of a rainy day.

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

An annual snowfall of 48.1 inches in Boston means that it is snowier than most places in Massachusetts.

Any measurable snowfall is a rare occurance in San Francisco.

January is the snowiest month in Boston with 14.2 inches of snow, and 6 months of the year have significant snowfall.