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Monthly climate in San Antonio, Puerto Rico

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification San Antonio features a tropical monsoon climate (Am). Temperatures typically range between 25 °C (76 °F) and 27 °C (82 °F) through the year, but rarely can drop to 20 °C (69 °F) or can rise to as high as 32 °C (89 °F). The average annual precipitation amounts to about 1038 mm (40.9 inches) and receives 207 rainy days on the 1 mm (0.04 inches) threshold annually. San Antonio enjoys an average of 3942 hours of sunshine throughout the year, and daylight varies from 11 hours 1 minutes to 13 hours 12 minutes per day.

Monthly average temperatures in San Antonio, Puerto Rico

The warmest months in San Antonio are July, August and September, with daily mean temperatures ranging from 27 to 27 °C (81 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from 25 to 25 °C (76 - 77 °F) throughout the day. On average each year, San Antonio experiences 326 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 Antonio. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum29°C
(84°F)		30°C
(86°F)		29°C
(84°F)		30°C
(86°F)		31°C
(88°F)		31°C
(88°F)		31°C
(88°F)		32°C
(89°F)		31°C
(88°F)		31°C
(88°F)		30°C
(85°F)		30°C
(86°F)
Mean maximum28°C
(83°F)		29°C
(84°F)		28°C
(83°F)		29°C
(84°F)		30°C
(86°F)		30°C
(86°F)		30°C
(87°F)		31°C
(88°F)		31°C
(88°F)		30°C
(87°F)		29°C
(85°F)		29°C
(84°F)
Average high27°C
(81°F)		27°C
(81°F)		27°C
(81°F)		27°C
(82°F)		28°C
(83°F)		29°C
(84°F)		29°C
(85°F)		30°C
(86°F)		29°C
(85°F)		29°C
(85°F)		28°C
(83°F)		28°C
(82°F)
Daily mean25°C
(77°F)		25°C
(76°F)		25°C
(76°F)		25°C
(78°F)		26°C
(79°F)		27°C
(81°F)		27°C
(81°F)		27°C
(82°F)		27°C
(81°F)		27°C
(81°F)		26°C
(79°F)		25°C
(78°F)
Average low23°C
(74°F)		23°C
(73°F)		23°C
(73°F)		23°C
(74°F)		24°C
(76°F)		25°C
(78°F)		26°C
(79°F)		26°C
(79°F)		26°C
(79°F)		25°C
(78°F)		25°C
(77°F)		24°C
(75°F)
Mean minimum22°C
(72°F)		22°C
(72°F)		22°C
(71°F)		22°C
(72°F)		24°C
(75°F)		24°C
(76°F)		25°C
(77°F)		25°C
(77°F)		25°C
(77°F)		24°C
(76°F)		23°C
(75°F)		23°C
(73°F)
Minimum20°C
(69°F)		21°C
(69°F)		21°C
(70°F)		22°C
(72°F)		23°C
(74°F)		24°C
(76°F)		24°C
(76°F)		24°C
(76°F)		25°C
(77°F)		24°C
(76°F)		23°C
(74°F)		23°C
(73°F)

Compare climate in San Antonio with other places

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

Monthly average precipitation in San Antonio, Puerto Rico

San Antonio usually has the most precipitation in September, October and November, with an average of 21 rainy days and 138 mm (5.4 inches) of precipitation per month. The driest months in San Antonio are January, February and December. On average, 39 mm (1.5 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)34 (1.3)39 (1.5)72 (2.8)66 (2.6)97 (3.8)85 (3.3)91 (3.6)97 (3.8)188 (7.4)127 (5.0)99 (3.9)43 (1.7)
Average precipitation days (≥ 1 mm)111317141917182023211915

Monthly sunshine hours in San Antonio, Puerto Rico

The sunniest months in San Antonio are May, June and July, when the sun shines an average of 11 hours 40 minutes a day. Least sunny months in San Antonio: January, February and November receive an average of 9 hours 36 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 hours260306346351360352361352316315297319
Mean daily daylight hours11h 8m11h 32m12h 2m12h 33m12h 59m13h 12m13h 5m12h 42m12h 12m11h 41m11h 14m11h 1m

Solar UV radiation in San Antonio, Puerto Rico

San Antonio experiences the highest level of ultraviolet (UV) radiation in April, May and September, when the maximum UV index can reach values of 13 - 14, 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 9. 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)911131314131313131298