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Monthly climate in San Diego, Mexico

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification San Diego features a hot semi-arid climate (BSh). Temperatures typically range between 15 °C (60 °F) and 25 °C (77 °F) through the year, but rarely can drop to 1 °C (34 °F) or can rise to as high as 39 °C (103 °F). The average annual precipitation amounts to about 678 mm (26.7 inches) and receives 127 rainy days on the 1 mm (0.04 inches) threshold annually. San Diego enjoys an average of 3343 hours of sunshine throughout the year, and daylight varies from 10 hours 48 minutes to 13 hours 26 minutes per day.

Monthly average temperatures in San Diego, Mexico

The warmest months in San Diego are May, June and August, with daily mean temperatures ranging from 24 to 25 °C (76 - 77 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 15 to 18 °C (60 - 64 °F) throughout the day. On average each year, San Diego experiences 250 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. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum34°C
(93°F)		36°C
(97°F)		38°C
(101°F)		39°C
(102°F)		39°C
(103°F)		38°C
(101°F)		35°C
(96°F)		35°C
(96°F)		36°C
(98°F)		33°C
(92°F)		33°C
(92°F)		32°C
(89°F)
Mean maximum31°C
(88°F)		33°C
(92°F)		36°C
(98°F)		38°C
(100°F)		38°C
(100°F)		36°C
(97°F)		34°C
(94°F)		34°C
(93°F)		34°C
(93°F)		32°C
(90°F)		31°C
(88°F)		30°C
(87°F)
Average high22°C
(73°F)		26°C
(79°F)		29°C
(84°F)		31°C
(89°F)		32°C
(91°F)		31°C
(88°F)		30°C
(87°F)		31°C
(87°F)		29°C
(84°F)		27°C
(81°F)		25°C
(77°F)		24°C
(75°F)
Daily mean15°C
(60°F)		18°C
(64°F)		20°C
(69°F)		23°C
(74°F)		25°C
(77°F)		25°C
(76°F)		24°C
(76°F)		24°C
(76°F)		23°C
(74°F)		21°C
(70°F)		18°C
(65°F)		16°C
(61°F)
Average low10°C
(51°F)		12°C
(54°F)		14°C
(58°F)		17°C
(63°F)		20°C
(68°F)		20°C
(68°F)		20°C
(67°F)		20°C
(67°F)		19°C
(66°F)		17°C
(62°F)		13°C
(56°F)		10°C
(51°F)
Mean minimum5°C
(41°F)		5°C
(42°F)		9°C
(49°F)		12°C
(54°F)		16°C
(62°F)		18°C
(65°F)		18°C
(64°F)		18°C
(64°F)		16°C
(62°F)		12°C
(53°F)		7°C
(45°F)		4°C
(40°F)
Minimum4°C
(40°F)		2°C
(37°F)		4°C
(40°F)		10°C
(51°F)		13°C
(56°F)		16°C
(61°F)		16°C
(62°F)		17°C
(62°F)		15°C
(59°F)		9°C
(48°F)		1°C
(34°F)		1°C
(35°F)

Compare climate in San Diego with other places

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

Monthly average precipitation in San Diego, Mexico

San Diego usually has the most precipitation in June, September and October, with an average of 17 rainy days and 114 mm (4.5 inches) of precipitation per month. The driest months in San Diego are January, February and December. On average, 16 mm (0.6 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in San Diego. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)16 (0.6)20 (0.8)23 (0.9)22 (0.8)59 (2.3)100 (4.0)85 (3.3)71 (2.8)120 (4.7)121 (4.8)28 (1.1)12 (0.5)
Average precipitation days (≥ 1 mm)366612191716191463

Monthly sunshine hours in San Diego, Mexico

The sunniest months in San Diego are June, July and August, when the sun shines an average of 10 hours 32 minutes a day. Least sunny months in San Diego: January, February and November receive an average of 7 hours 30 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in San Diego. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours196236284287315317328322284270242255
Mean daily daylight hours10h 56m11h 25m12h 1m12h 39m13h 11m13h 26m13h 18m12h 50m12h 14m11h 36m11h 4m10h 48m

Solar UV radiation in San Diego, Mexico

San Diego experiences the highest level of ultraviolet (UV) radiation in April, May and July, when the maximum UV index can reach values of 14 - 14, which corresponds to the Extreme category of sun exposure. January, November and December are in the High / Very High exposure category. In these months, the maximum values of the UV index do not exceed 9. For more detailed information, check out our hourly San Diego UV Index data.

Average daily maximum UV levels by month for San Diego. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)811131414131413131297