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The climate of San Francisco (California - United States of America)
San Francisco is located on the west coast of the United States and is seen as one of the most beautiful cities in America. The island of Alcatraz, the Golden Gate Bridge, the cable trams and the hills are characteristic of this gay friendly city. The Urban area of San Francisco consists of the cities of San Francisco, San José, Oakland and Berkeley and is also known as the San Francisco Bay Area. San Francisco has a moderate maritime climate with mild winters and fairly cool summers caused by the cold sea water which tempers temperatures during the summer. The cold sea water is supplied by the California Current. San Francisco is an amazing city. However, it is not really suitable as a beach destination. The maximum temperature of the sea water is only 15 degrees Celsius (59.0 degrees Fahrenheit).
One striking feature of the climate of San Francisco is the fact that there are small differences in temperatures between summer and winter. Temperatures gradually rise till September which is the warmest month. One of the typical characteristics of the Bay Area is that September is the warmest month instead of July or August which is normal in a city located in the northern hemisphere. Another characteristic is that chances of precipitation during the summer are very low and the sun shines for 95% of the theoretically possible time during the months of July, August and September. The amount of hours of sunshine is very high by American standards; in many places it is even higher than along the Mediterranean Sea in Europe. Winters are not as sunny as summers. In December and January skies are cloudy for about 50% of the time. During spring and fall San Francisco is often shrouded in fog which is caused by the differences in temperatures between the cold sea water and the warmer land in the interior. During the summer mornings are often foggy after which the fog dissolves. During the summer humidity figures are very low by American standards, only 30%.


Climate information
The figures below are based on long term weather and climate records. They are an average for San Francisco:

temperature (°C)


temperature (°C)
hours of sunshine

average days with precipitation
per month
per month
temperature (°C)
January 13 7 6 10 12
February 16 8 7 9 12
March 16 8 9 10 12
April 17 9 10 6 12
May 18 10 11 3 12
June 19 11 11 1 12
July 20 12 10 1 13
August 20 13 10 1 14
September 22 13 9 2 14
October 21 12 8 4 14
November 17 10 6 8 14
December 14 7 5 9 13
= 0-5 mm ● = 6-30 mm ● = 31-60 mm ● = 61-100 mm ● = 101-200 mm ● = over 200 mm
= 0-0.2 inches ● = 0.2-1.2 inches ● = 1.2-2.4 inches ● = 2.5-4 inches ● = 4.1-8 inches ● = over 8 inches

More climate information
Climate figures are very useful but don’t present a general impression of the climate and the eventual weather circumstances within a certain period. The figures don’t always reflect the chance of wintry weather, extreme heat or hurricanes. That is why we offer useful extra climate information for each month of the year:

chance of
(very) hot


chance of
(very) cool
chance of

chance of
chance of
sunny days


click here for the explanation of the symbols

The information at this site was carefully composed from climate data collected by meteorological services, meteorological offices, climate experts and other sources. “More climate info” is based on statistics, climate data and personal experience. No rights can be derived from this site. Weather has no memory and gives no guaranties. Nothing is as changeable and unpredictable as the weather. The authors of this site feel in no way responsible for any damages caused by misinterpretation or other circumstances that may influence your holiday or trip to a certain destination. We provide information, it’s up to the reader to use it to it’s benefit.


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