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Monthly climate in San Marcos, Mexico

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification San Marcos features a cold semi-arid climate (BSk). Temperatures typically range between 12 °C (54 °F) and 22 °C (73 °F) through the year, but rarely can drop to -7 °C (19 °F) or can rise to as high as 35 °C (95 °F). The average annual precipitation amounts to about 500 mm (19.7 inches) and receives 67 rainy days on the 1 mm (0.04 inches) threshold annually. San Marcos enjoys an average of 3634 hours of sunshine throughout the year, and daylight varies from 10 hours 38 minutes to 13 hours 36 minutes per day.

Monthly average temperatures in San Marcos, Mexico

The warmest months in San Marcos are May, June and August, with daily mean temperatures ranging from 21 to 22 °C (70 - 73 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 12 to 15 °C (54 - 59 °F) throughout the day. On average each year, San Marcos experiences 156 days above 25 °C (77.0 °F) and 4 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 Marcos. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum26°C
(79°F)		31°C
(88°F)		33°C
(92°F)		33°C
(92°F)		34°C
(94°F)		35°C
(95°F)		32°C
(90°F)		31°C
(88°F)		30°C
(85°F)		28°C
(83°F)		28°C
(82°F)		27°C
(81°F)
Mean maximum24°C
(76°F)		28°C
(82°F)		30°C
(85°F)		31°C
(87°F)		33°C
(91°F)		32°C
(91°F)		30°C
(86°F)		29°C
(84°F)		28°C
(82°F)		27°C
(81°F)		26°C
(80°F)		25°C
(77°F)
Average high19°C
(67°F)		22°C
(72°F)		25°C
(78°F)		27°C
(82°F)		29°C
(85°F)		28°C
(83°F)		26°C
(79°F)		26°C
(79°F)		23°C
(74°F)		24°C
(75°F)		22°C
(72°F)		20°C
(68°F)
Daily mean12°C
(54°F)		15°C
(59°F)		18°C
(64°F)		20°C
(68°F)		22°C
(73°F)		22°C
(73°F)		20°C
(69°F)		21°C
(70°F)		18°C
(65°F)		18°C
(64°F)		15°C
(59°F)		12°C
(55°F)
Average low6°C
(42°F)		8°C
(46°F)		10°C
(50°F)		12°C
(55°F)		15°C
(59°F)		16°C
(61°F)		15°C
(60°F)		15°C
(59°F)		14°C
(58°F)		12°C
(54°F)		8°C
(47°F)		6°C
(43°F)
Mean minimum-1°C
(30°F)		2°C
(35°F)		6°C
(42°F)		8°C
(46°F)		11°C
(51°F)		14°C
(57°F)		13°C
(56°F)		13°C
(56°F)		11°C
(53°F)		7°C
(45°F)		2°C
(36°F)		-2°C
(28°F)
Minimum-4°C
(26°F)		-3°C
(27°F)		3°C
(37°F)		5°C
(42°F)		7°C
(46°F)		12°C
(53°F)		12°C
(55°F)		12°C
(54°F)		11°C
(51°F)		6°C
(43°F)		-5°C
(23°F)		-7°C
(19°F)

Compare climate in San Marcos with other places

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

Monthly average precipitation in San Marcos, Mexico

San Marcos usually has the most precipitation in July, August and September, with an average of 13 rainy days and 110 mm (4.3 inches) of precipitation per month. The driest months in San Marcos are February, April and December. On average, 10 mm (0.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in San Marcos. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)12 (0.5)10 (0.4)11 (0.4)9 (0.4)15 (0.6)52 (2.1)136 (5.4)67 (2.6)125 (4.9)43 (1.7)10 (0.4)9 (0.3)
Average precipitation days (≥ 1 mm)11224815818611

Monthly sunshine hours in San Marcos, Mexico

The sunniest months in San Marcos are May, June and July, when the sun shines an average of 11 hours 16 minutes a day. Least sunny months in San Marcos: January, February and November receive an average of 8 hours 27 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in San Marcos. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours224264312326350341344340287292272276
Mean daily daylight hours10h 48m11h 20m12h 1m12h 43m13h 19m13h 36m13h 26m12h 55m12h 15m11h 32m10h 56m10h 38m

Solar UV radiation in San Marcos, Mexico

San Marcos experiences the highest level of ultraviolet (UV) radiation in April, May and August, 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 Marcos UV Index data.

Average daily maximum UV levels by month for San Marcos. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)811131414141414131297