San Diego Temperatures: Averages by Month





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

The average high and low temperatures are listed below monthly and annually for San Diego, 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 Diego, scroll down farther. There are also counts of nights with warm temperatures and days with cold weather.

The first set of high and low temperatures are averages for 2010 to 2019. Everything else here is based on 1991 to 2020 weather.

10-year temperature averages for San Diego, 2010 to 2019
High °F Low °F   High °C Low °C
66 50 January 19 10
66 52 February 19 11
67 55 March 19 13
69 57 April 20 14
70 60 May 21 16
72 63 June 22 17
75 66 July 24 19
77 68 August 25 20
77 66 September 25 19
75 62 October 24 16
71 55 November 22 13
66 50 December 19 10
71 59 Year 22 15
30-year temperature averages for San Diego, 1991 to 2020
High °F Low °F   High °C Low °C
65 49 January 18 9
65 51 February 18 10
66 53 March 19 12
68 56 April 20 13
69 59 May 20 15
71 62 June 22 17
75 65 July 24 19
76 67 August 25 19
76 65 September 24 18
73 61 October 23 16
69 54 November 21 12
65 48 December 18 9
70 58 Year 21 14

Days of Hot Weather in San Diego

Despite its southern location, San Diego rarely gets hot. Temperatures over 100 °F (38 °C) have appeared on average just once a decade. Indeed, the city typically has only three days a year when the thermometer reaches 90 degrees (32 °C).

Yet warm weather is a year round occurrence in San Diego. A day of 80 degrees can happen in any month of the year, although it's rare in December.

San Diego's nights are equally mild with an average of just eight nights a year when the thermometer stays above 70 degrees.

Days per month in San Diego of at least 60, 70 or 80 °F
  60 °F
16 °C
70 °F
21 °C
80 °F
27 °C
January 28 8 1
February 25 6 1
March 30 6 1
April 29 9 2
May 31 12 1
June 30 19 1
July 31 29 4
August 31 30 7
September 30 29 8
October 31 23 6
November 30 14 3
December 28 7 0
Year 354 192 35
Average number of nights in each month at San Diego that stay above 50, 60 or 70 °F
  50 °F
10 °C
60 °F
16 °C
70 °F
21 °C
January 13 0 0
February 17 0 0
March 26 1 0
April 29 3 0
May 31 13 0
June 30 23 0
July 31 31 2
August 31 31 3
September 30 29 3
October 31 19 0
November 24 2 0
December 12 0 0
Year 305 152 8

How Often San Diego Has Cold Temperatures

San Diego normally does not have cold weather. Every day in a typical year warms to at least 50 °F (10 °C).

The city averages just one night a year when the thermometer dips as low as 40 °F (4 °C). But San Diego never gets cold enough to freeze.

References

Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

San Diego Weather
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