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Monthly climate in Rancho San Diego, California, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Rancho San Diego features a hot-summer Mediterranean climate (Csa).Temperatures typically range between 13 °C (56 °F) and 23 °C (74 °F) through the year, but rarely can drop to 3 °C (38 °F) or can rise to as high as 38 °C (101 °F).The average annual precipitation amounts to about 337 mm (13.3 inches) and receives 41 rainy days on the 1 mm (0.04 inches) threshold annually.Rancho 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 Rancho San Diego, California, United States §

The warmest months in Rancho San Diego are July, August and September, with daily mean temperatures ranging from 22 to 23 °C (72 - 74 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 13 to 14 °C (56 - 57 °F) throughout the day. On average each year, Rancho San Diego experiences 97 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 Rancho 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 30°C
(86°F)		 30°C
(87°F)		 29°C
(84°F)		 35°C
(95°F)		 30°C
(87°F)		 33°C
(92°F)		 38°C
(100°F)		 33°C
(92°F)		 38°C
(101°F)		 38°C
(100°F)		 33°C
(92°F)		 27°C
(81°F)
Mean maximum 26°C
(79°F)		 25°C
(77°F)		 26°C
(78°F)		 30°C
(85°F)		 28°C
(83°F)		 29°C
(85°F)		 32°C
(89°F)		 32°C
(90°F)		 34°C
(93°F)		 34°C
(94°F)		 32°C
(89°F)		 24°C
(76°F)
Average high 18°C
(65°F)		 18°C
(65°F)		 18°C
(66°F)		 21°C
(70°F)		 21°C
(70°F)		 24°C
(75°F)		 27°C
(80°F)		 28°C
(82°F)		 27°C
(81°F)		 26°C
(78°F)		 22°C
(73°F)		 19°C
(66°F)
Daily mean 13°C
(56°F)		 13°C
(56°F)		 14°C
(57°F)		 16°C
(61°F)		 17°C
(63°F)		 19°C
(67°F)		 22°C
(72°F)		 23°C
(74°F)		 22°C
(72°F)		 20°C
(68°F)		 17°C
(62°F)		 14°C
(57°F)
Average low 9°C
(49°F)		 9°C
(48°F)		 10°C
(50°F)		 12°C
(54°F)		 14°C
(57°F)		 16°C
(61°F)		 19°C
(66°F)		 19°C
(67°F)		 18°C
(65°F)		 15°C
(60°F)		 12°C
(54°F)		 9°C
(49°F)
Mean minimum 5°C
(41°F)		 4°C
(40°F)		 6°C
(43°F)		 9°C
(49°F)		 10°C
(50°F)		 13°C
(56°F)		 16°C
(61°F)		 17°C
(63°F)		 15°C
(60°F)		 11°C
(52°F)		 9°C
(48°F)		 5°C
(41°F)
Minimum 4°C
(39°F)		 3°C
(38°F)		 4°C
(40°F)		 8°C
(47°F)		 9°C
(49°F)		 12°C
(54°F)		 15°C
(60°F)		 16°C
(62°F)		 14°C
(57°F)		 9°C
(48°F)		 7°C
(45°F)		 4°C
(39°F)

Compare climate in Rancho San Diego with other places

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

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

Rancho San Diego usually has the most precipitation in January, February and December, with an average of 6 rainy days and 63 mm (2.5 inches) of precipitation per month.The driest months in Rancho 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 Rancho 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) 56 (2.2) 68 (2.7) 51 (2.0) 24 (0.9) 21 (0.8) 2 (0.1) 3 (0.1) 1 (0.1) 4 (0.1) 14 (0.6) 29 (1.1) 65 (2.5)
Average precipitation days (≥ 1 mm) 6 7 10 3 4 0 1 0 1 2 2 5

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

The sunniest months in Rancho San Diego are May, June and July, when the sun shines an average of 11 hours 59 minutes a day.Least sunny months in Rancho 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 Rancho 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 51m 14h 15m 14h 1m 13h 17m 12h 19m 11h 19m 10h 27m 10h 1m

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

Rancho 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 Rancho San Diego UV Index data.

Average daily maximum UV levels by month for Rancho 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