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Monthly climate in San Juan, Mexico

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification San Juan features a tropical savanna climate (Aw). Temperatures typically range between 21 °C (70 °F) and 27 °C (81 °F) through the year, but rarely can drop to 9 °C (48 °F) or can rise to as high as 37 °C (99 °F). The average annual precipitation amounts to about 1846 mm (72.7 inches) and receives 149 rainy days on the 1 mm (0.04 inches) threshold annually. San Juan enjoys an average of 3370 hours of sunshine throughout the year, and daylight varies from 10 hours 58 minutes to 13 hours 16 minutes per day.

Monthly average temperatures in San Juan, Mexico

The warmest months in San Juan are March, April and May, with daily mean temperatures ranging from 25 to 27 °C (78 - 81 °F) throughout the day. The coldest temperatures usually occur in January, November and December, when daily mean temperatures range from 21 to 22 °C (70 - 73 °F) throughout the day. On average each year, San Juan experiences 321 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 Juan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum32°C
(90°F)		34°C
(93°F)		35°C
(95°F)		37°C
(98°F)		37°C
(99°F)		35°C
(95°F)		33°C
(92°F)		33°C
(92°F)		32°C
(89°F)		32°C
(90°F)		32°C
(90°F)		31°C
(88°F)
Mean maximum31°C
(89°F)		33°C
(92°F)		34°C
(94°F)		36°C
(97°F)		36°C
(98°F)		34°C
(93°F)		33°C
(91°F)		33°C
(91°F)		31°C
(88°F)		31°C
(88°F)		31°C
(89°F)		30°C
(87°F)
Average high29°C
(84°F)		30°C
(86°F)		33°C
(91°F)		34°C
(93°F)		34°C
(94°F)		30°C
(86°F)		30°C
(86°F)		29°C
(85°F)		28°C
(83°F)		29°C
(84°F)		29°C
(84°F)		28°C
(83°F)
Daily mean22°C
(71°F)		23°C
(74°F)		25°C
(78°F)		27°C
(80°F)		27°C
(81°F)		25°C
(78°F)		25°C
(77°F)		24°C
(76°F)		24°C
(75°F)		24°C
(75°F)		22°C
(73°F)		21°C
(70°F)
Average low15°C
(59°F)		16°C
(61°F)		18°C
(64°F)		19°C
(66°F)		21°C
(69°F)		21°C
(70°F)		21°C
(69°F)		21°C
(69°F)		20°C
(69°F)		19°C
(67°F)		17°C
(63°F)		15°C
(59°F)
Mean minimum11°C
(52°F)		12°C
(54°F)		15°C
(59°F)		15°C
(60°F)		17°C
(63°F)		19°C
(67°F)		19°C
(67°F)		19°C
(67°F)		19°C
(66°F)		17°C
(63°F)		14°C
(57°F)		11°C
(53°F)
Minimum9°C
(48°F)		10°C
(50°F)		13°C
(55°F)		14°C
(58°F)		16°C
(61°F)		18°C
(64°F)		18°C
(65°F)		18°C
(65°F)		18°C
(65°F)		14°C
(58°F)		12°C
(53°F)		9°C
(48°F)

Compare climate in San Juan with other places

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

Monthly average precipitation in San Juan, Mexico

San Juan usually has the most precipitation in July, August and September, with an average of 28 rainy days and 395 mm (15.5 inches) of precipitation per month. The driest months in San Juan are March, April and December. On average, 2 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in San Juan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)2 (0.1)3 (0.1)2 (0.1)0 (0.0)60 (2.4)318 (12.5)344 (13.5)445 (17.5)396 (15.6)231 (9.1)43 (1.7)2 (0.1)
Average precipitation days (≥ 1 mm)01006252930272380

Monthly sunshine hours in San Juan, Mexico

The sunniest months in San Juan are March, April and May, when the sun shines an average of 10 hours 32 minutes a day. Least sunny months in San Juan: January, August and September receive an average of 8 hours 6 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in San Juan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours237272319322328266274262245273278288
Mean daily daylight hours11h 5m11h 30m12h 2m12h 35m13h 2m13h 16m13h 8m12h 44m12h 12m11h 40m11h 12m10h 58m

Solar UV radiation in San Juan, Mexico

San Juan experiences the highest level of ultraviolet (UV) radiation in April, June 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 Juan UV Index data.

Average daily maximum UV levels by month for San Juan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)911131313141313131198