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Monthly climate in San Antonio, Mexico

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification San Antonio features a cold semi-arid climate (BSk). Temperatures typically range between 13 °C (55 °F) and 22 °C (71 °F) through the year, but rarely can drop to -5 °C (22 °F) or can rise to as high as 34 °C (94 °F). The average annual precipitation amounts to about 617 mm (24.3 inches) and receives 77 rainy days on the 1 mm (0.04 inches) threshold annually. San Antonio enjoys an average of 3654 hours of sunshine throughout the year, and daylight varies from 10 hours 46 minutes to 13 hours 27 minutes per day.

Monthly average temperatures in San Antonio, Mexico

The warmest months in San Antonio are May, June and August, with daily mean temperatures ranging from 20 to 22 °C (68 - 71 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 13 to 15 °C (55 - 59 °F) throughout the day. On average each year, San Antonio experiences 176 days above 25 °C (77.0 °F) and 1 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 Antonio. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum26°C
(79°F)		30°C
(85°F)		33°C
(91°F)		33°C
(91°F)		34°C
(94°F)		34°C
(94°F)		31°C
(88°F)		31°C
(89°F)		29°C
(84°F)		29°C
(84°F)		28°C
(83°F)		27°C
(80°F)
Mean maximum25°C
(77°F)		28°C
(82°F)		30°C
(86°F)		31°C
(88°F)		32°C
(91°F)		32°C
(89°F)		29°C
(85°F)		29°C
(85°F)		27°C
(82°F)		28°C
(82°F)		27°C
(81°F)		25°C
(78°F)
Average high21°C
(70°F)		23°C
(74°F)		27°C
(80°F)		28°C
(83°F)		29°C
(85°F)		28°C
(82°F)		26°C
(79°F)		26°C
(80°F)		24°C
(76°F)		25°C
(77°F)		24°C
(75°F)		21°C
(70°F)
Daily mean13°C
(55°F)		15°C
(59°F)		18°C
(65°F)		20°C
(68°F)		22°C
(71°F)		21°C
(70°F)		20°C
(68°F)		20°C
(68°F)		19°C
(66°F)		18°C
(64°F)		15°C
(60°F)		13°C
(55°F)
Average low6°C
(43°F)		7°C
(46°F)		10°C
(50°F)		11°C
(52°F)		13°C
(56°F)		15°C
(59°F)		14°C
(58°F)		15°C
(58°F)		14°C
(57°F)		12°C
(54°F)		8°C
(47°F)		6°C
(43°F)
Mean minimum1°C
(34°F)		3°C
(37°F)		6°C
(43°F)		7°C
(44°F)		9°C
(49°F)		13°C
(55°F)		12°C
(54°F)		12°C
(55°F)		11°C
(52°F)		8°C
(46°F)		4°C
(40°F)		0°C
(32°F)
Minimum-1°C
(31°F)		1°C
(34°F)		4°C
(40°F)		5°C
(41°F)		8°C
(46°F)		10°C
(51°F)		12°C
(53°F)		11°C
(52°F)		9°C
(49°F)		5°C
(41°F)		0°C
(32°F)		-5°C
(22°F)

Compare climate in San Antonio with other places

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

Monthly average precipitation in San Antonio, Mexico

San Antonio usually has the most precipitation in June, July and September, with an average of 14 rainy days and 130 mm (5.1 inches) of precipitation per month. The driest months in San Antonio are February, March and April. On average, 9 mm (0.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in San Antonio. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)18 (0.7)11 (0.4)10 (0.4)6 (0.2)30 (1.2)116 (4.6)137 (5.4)79 (3.1)135 (5.3)48 (1.9)14 (0.6)12 (0.5)
Average precipitation days (≥ 1 mm)3121512161115821

Monthly sunshine hours in San Antonio, Mexico

The sunniest months in San Antonio are May, July and August, when the sun shines an average of 10 hours 57 minutes a day. Least sunny months in San Antonio: January, February and November receive an average of 8 hours 40 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in San Antonio. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours230268318328350331334334297295282282
Mean daily daylight hours10h 55m11h 24m12h 1m12h 40m13h 12m13h 27m13h 19m12h 50m12h 14m11h 35m11h 3m10h 46m

Solar UV radiation in San Antonio, Mexico

San Antonio experiences the highest level of ultraviolet (UV) radiation in April, May and September, when the maximum UV index can reach values of 14 - 15, which corresponds to the Extreme category of sun exposure. January, November and December are in the Very High exposure category. In these months, the maximum values of the UV index do not exceed 10. For more detailed information, check out our hourly San Antonio UV Index data.

Average daily maximum UV levels by month for San Antonio. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)9111415151414141412108