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Monthly climate in San Fernando, Mexico

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification San Fernando features a hot semi-arid climate (BSh). Temperatures typically range between 17 °C (63 °F) and 30 °C (87 °F) through the year, but rarely can drop to -3 °C (27 °F) or can rise to as high as 43 °C (109 °F). The average annual precipitation amounts to about 589 mm (23.2 inches) and receives 86 rainy days on the 1 mm (0.04 inches) threshold annually. San Fernando enjoys an average of 3405 hours of sunshine throughout the year, and daylight varies from 10 hours 36 minutes to 13 hours 38 minutes per day.

Monthly average temperatures in San Fernando, Mexico

The warmest months in San Fernando are June, July and August, with daily mean temperatures ranging from 29 to 30 °C (85 - 87 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 17 to 19 °C (63 - 67 °F) throughout the day. On average each year, San Fernando experiences 269 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 Fernando. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum36°C
(98°F)		37°C
(99°F)		37°C
(99°F)		41°C
(107°F)		39°C
(103°F)		43°C
(109°F)		41°C
(107°F)		40°C
(104°F)		39°C
(103°F)		37°C
(99°F)		33°C
(93°F)		33°C
(92°F)
Mean maximum32°C
(89°F)		33°C
(92°F)		35°C
(96°F)		38°C
(102°F)		38°C
(101°F)		39°C
(102°F)		39°C
(103°F)		39°C
(102°F)		38°C
(100°F)		35°C
(96°F)		32°C
(91°F)		31°C
(88°F)
Average high23°C
(74°F)		25°C
(78°F)		28°C
(84°F)		31°C
(89°F)		34°C
(93°F)		35°C
(95°F)		35°C
(96°F)		37°C
(98°F)		34°C
(93°F)		30°C
(87°F)		27°C
(80°F)		25°C
(77°F)
Daily mean17°C
(63°F)		19°C
(67°F)		22°C
(73°F)		25°C
(78°F)		28°C
(83°F)		29°C
(85°F)		30°C
(86°F)		30°C
(87°F)		28°C
(83°F)		25°C
(77°F)		21°C
(70°F)		18°C
(66°F)
Average low12°C
(55°F)		14°C
(58°F)		18°C
(64°F)		20°C
(69°F)		24°C
(75°F)		25°C
(77°F)		25°C
(77°F)		25°C
(78°F)		24°C
(75°F)		20°C
(68°F)		16°C
(61°F)		14°C
(57°F)
Mean minimum3°C
(38°F)		5°C
(40°F)		10°C
(50°F)		14°C
(57°F)		18°C
(65°F)		22°C
(73°F)		23°C
(73°F)		24°C
(75°F)		20°C
(69°F)		10°C
(50°F)		7°C
(45°F)		4°C
(40°F)
Minimum-1°C
(31°F)		-3°C
(27°F)		4°C
(40°F)		10°C
(50°F)		15°C
(60°F)		20°C
(68°F)		22°C
(72°F)		22°C
(72°F)		19°C
(66°F)		8°C
(46°F)		1°C
(35°F)		2°C
(35°F)

Compare climate in San Fernando with other places

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

Monthly average precipitation in San Fernando, Mexico

San Fernando usually has the most precipitation in July, September and October, with an average of 11 rainy days and 94 mm (3.7 inches) of precipitation per month. The driest months in San Fernando are January, February and December. On average, 18 mm (0.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in San Fernando. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)24 (0.9)16 (0.6)36 (1.4)30 (1.2)58 (2.3)72 (2.9)86 (3.4)25 (1.0)109 (4.3)87 (3.4)33 (1.3)13 (0.5)
Average precipitation days (≥ 1 mm)4456812105131162

Monthly sunshine hours in San Fernando, Mexico

The sunniest months in San Fernando are June, July and August, when the sun shines an average of 10 hours 54 minutes a day. Least sunny months in San Fernando: January, February and December receive an average of 7 hours 29 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in San Fernando. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours191232275280320330332340291292258258
Mean daily daylight hours10h 46m11h 19m12h 1m12h 44m13h 21m13h 38m13h 28m12h 56m12h 15m11h 32m10h 55m10h 36m

Solar UV radiation in San Fernando, Mexico

San Fernando experiences the highest level of ultraviolet (UV) radiation in April, May and August, when the maximum UV index can reach values of 12 - 12, 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 8. For more detailed information, check out our hourly San Fernando UV Index data.

Average daily maximum UV levels by month for San Fernando. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)79111212121212111086