San Diego CA Average Temperatures 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.

San Diego Temperatures: Averages by Month

Days of Hot Weather in San Diego

How Often San Diego Has Cold Temperatures

References

More on Weather in California