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Monthly climate in San Diego, California, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification San Diego features a cold semi-arid climate (BSk). Temperatures typically range between 14 °C (57 °F) and 21 °C (71 °F) through the year, but rarely can drop to 7 °C (45 °F) or can rise to as high as 32 °C (90 °F). The average annual precipitation amounts to about 279 mm (11.0 inches) and receives 34 rainy days on the 1 mm (0.04 inches) threshold annually. San Diego enjoys an average of 3628 hours of sunshine throughout the year, and daylight varies from 10 hours 1 minutes to 14 hours 15 minutes per day.

Monthly average temperatures in San Diego, California, United States §

The warmest months in San Diego are July, August and September, with daily mean temperatures ranging from 21 to 21 °C (69 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 14 to 15 °C (57 - 59 °F) throughout the day. On average each year, San Diego experiences 26 days above 25 °C (77.0 °F) and 0 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in San Diego, California, United States. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 25°C
(77°F)		 26°C
(79°F)		 26°C
(80°F)		 29°C
(84°F)		 25°C
(78°F)		 29°C
(84°F)		 29°C
(85°F)		 29°C
(84°F)		 31°C
(88°F)		 32°C
(90°F)		 27°C
(81°F)		 24°C
(76°F)
Mean maximum 22°C
(72°F)		 22°C
(71°F)		 22°C
(72°F)		 25°C
(77°F)		 23°C
(74°F)		 24°C
(76°F)		 27°C
(80°F)		 27°C
(81°F)		 28°C
(83°F)		 29°C
(85°F)		 27°C
(80°F)		 22°C
(71°F)
Average high 17°C
(63°F)		 17°C
(63°F)		 17°C
(63°F)		 19°C
(66°F)		 19°C
(66°F)		 20°C
(69°F)		 23°C
(74°F)		 24°C
(75°F)		 24°C
(75°F)		 23°C
(73°F)		 20°C
(69°F)		 18°C
(64°F)
Daily mean 14°C
(58°F)		 14°C
(57°F)		 15°C
(59°F)		 16°C
(61°F)		 17°C
(62°F)		 18°C
(65°F)		 21°C
(69°F)		 21°C
(71°F)		 21°C
(70°F)		 20°C
(68°F)		 17°C
(63°F)		 15°C
(59°F)
Average low 12°C
(53°F)		 11°C
(53°F)		 12°C
(54°F)		 14°C
(57°F)		 15°C
(59°F)		 16°C
(62°F)		 19°C
(66°F)		 20°C
(68°F)		 19°C
(67°F)		 17°C
(63°F)		 14°C
(58°F)		 12°C
(54°F)
Mean minimum 9°C
(48°F)		 8°C
(47°F)		 9°C
(49°F)		 12°C
(54°F)		 13°C
(55°F)		 15°C
(59°F)		 17°C
(62°F)		 18°C
(64°F)		 17°C
(63°F)		 15°C
(59°F)		 12°C
(53°F)		 9°C
(49°F)
Minimum 8°C
(47°F)		 7°C
(45°F)		 8°C
(47°F)		 11°C
(53°F)		 12°C
(54°F)		 14°C
(58°F)		 16°C
(62°F)		 17°C
(63°F)		 17°C
(62°F)		 13°C
(55°F)		 10°C
(51°F)		 8°C
(47°F)

Compare climate in San Diego with other places

Compare temperature, precipitation, sunshine, UV index in San Diego, California, United States with other places around the world.

Monthly average precipitation in San Diego, California, United States §

San Diego usually has the most precipitation in January, February and December, with an average of 5 rainy days and 53 mm (2.1 inches) of precipitation per month. The driest months in San Diego are June, July and August. On average, 2 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in San Diego, California, United States. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 45 (1.8) 55 (2.2) 38 (1.5) 20 (0.8) 16 (0.6) 2 (0.1) 1 (0.1) 1 (0.0) 3 (0.1) 13 (0.5) 24 (0.9) 60 (2.4)
Average precipitation days (≥ 1 mm) 5 6 8 2 4 0 0 0 0 2 2 5

Monthly sunshine hours in San Diego, California, United States §

The sunniest months in San Diego are May, June and July, when the sun shines an average of 11 hours 59 minutes a day. Least sunny months in San Diego: January, February and December receive an average of 7 hours 20 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in San Diego, California, United States. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 194 242 299 324 361 365 376 360 318 296 256 231
Mean daily daylight hours 10h 15m 11h 1m 12h 0m 13h 0m 13h 50m 14h 15m 14h 1m 13h 16m 12h 19m 11h 19m 10h 27m 10h 1m

Solar UV radiation in San Diego, California, United States §

San Diego experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 11 - 11, which corresponds to the Extreme category of sun exposure. January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly San Diego UV Index data.

Average daily maximum UV levels by month for San Diego, California, United States. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 4 6 8 10 11 11 11 10 10 7 5 4

Detailed Monthly Weather Insights for San Diego, California, United States

Discover in-depth weather details for every month in San Diego. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about San Diego's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.