San Francisco Temperatures: Averages by Month





The numbers here tell you how hot and cold the weather usually is in San Francisco, California during each month of the year.

The average high and low temperatures are listed below monthly and annually for San Francisco, in both degrees Fahrenheit and Celsius.

Maximums and minimums are only part of the temperature picture. To fill in the rest, there's information on how many days a month get above or below a given temperature.

To find out how often it rises over 60, 70 or 80 °F each month in San Francisco, scroll down farther. There are also counts of nights with warm temperatures and days with cold weather.

The weather data were recorded in downtown San Francisco near the corner of Buchanan and Hermann Streets. All the numbers are averages, based on climate statistics gathered from 1981 to 2010.

Average San Francisco temperatures
High °F Low °F   High °C Low °C
57 46 January 14 8
60 48 February 16 9
62 49 March 17 9
63 49 April 17 10
64 51 May 18 11
66 53 June 19 12
67 54 July 19 12
68 55 August 20 13
70 55 September 21 13
69 54 October 21 12
63 50 November 17 10
57 46 December 14 8
64 51 Year 18 10

Days of Hot Weather in San Francisco

San Francisco averages just two days a year when the temperature reaches 90 degrees Fahrenheit, and none over 100. No matter how warm the day, at night the temperature always cools to less than 70 degrees.

The city's hottest days usually occur in September and October. But 80-degree weather can appear any month from April to October.

Days per month in San Francisco of at least 60, 70 or 80 °F
  60 °F
16 °C
70 °F
21 °C
80 °F
27 °C
January 8 0 0
February 13 2 0
March 17 4 0
April 18 5 1
May 23 5 1
June 26 7 1
July 28 7 1
August 29 10 2
September 29 12 4
October 28 12 4
November 20 5 0
December 8 0 0
Year 246 69 15
Average number of days monthly in San Francisco that stay above 50 or 60 °F
  50 °F
10 °C
60 °F
16 °C
January 5 0
February 8 0
March 10 0
April 12 0
May 19 0
June 26 0
July 30 1
August 31 1
September 30 1
October 28 1
November 16 0
December 5 0
Year 219 5

How Often San Francisco Has Cold Temperatures

It never gets really cold in San Franciso. All but five days a year on average have highs of at least 50 degrees.

Nighttime lows of 40 °F or less typically happen only five times annually. Freezing temperatures are not at all normal for the city.

Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

San Francisco Weather
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