San Francisco, CA Climate


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San Francisco, California has a mild climate all-year round with temperatures rarely rising above 70°F and rarely dropping below 50°F. The city experiences near-constant fog from June to August which brings cooler temperatures and strong coastal breezes. San Francisco averages 22 inches of rain annually, most of it falling during the winter months. There are usually 300 sunny days a year although the presence of persistent fog can reduce the amount of sunshine experienced in some areas.

San Francisco, California gets 25 inches of rain, on average, per year. The US average is 38 inches of rain per year.

San Francisco averages 0 inches of snow per year. The US average is 28 inches of snow per year.

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

San Francisco gets some kind of precipitation, on average, 72 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.


Weather Highlights

Summer High: the July high is around 67 degrees
Winter Low: the January low is 46
Rain: averages 25 inches of rain a year
Snow: averages 0 inches of snow a year


Bestplaces Comfort Index

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

9.2 Summer - 7.6 Winter
September, August and October are the most pleasant months in San Francisco, while January and December are the least comfortable months.

  ClimateSan Francisco, CaliforniaUnited States
  24.6 in.38.1 in.
  0.0 in.27.8 in.
  72.3 days106.2 days
  259 days205 days
  67.2°85.8°
  45.5°21.7°
  8.57
  5.44.3
  52 ft.2443 ft.
Climate
YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

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.
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.
January has the coldest nighttime temperatures for San Francisco with an average of 45.5°. This is one of the warmest places in California.
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 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.
Humidity in San Francisco is generally quite low and comfortable. There are few days during the summer when the humidity becomes unpleasant. The most humid months (but still comfortable) are August, July and September.
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.
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.
There is rarely any recorded snowfall in San Francisco, ranking it as one of the least snowy places in California. Any measurable snowfall is a rare occurance in San Francisco.
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