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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 cold semi-arid climate (BSk). Temperatures typically range between 12 °C (55 °F) and 22 °C (72 °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 506 mm (19.9 inches) and receives 65 rainy days on the 1 mm (0.04 inches) threshold annually. San Juan enjoys an average of 3650 hours of sunshine throughout the year, and daylight varies from 10 hours 44 minutes to 13 hours 30 minutes per day.

Monthly average temperatures in San Juan, Mexico

The warmest months in San Juan are May, June and August, with daily mean temperatures ranging from 20 to 22 °C (69 - 72 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 12 to 15 °C (55 - 59 °F) throughout the day. On average each year, San Juan experiences 170 days above 25 °C (77.0 °F) and 2 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
Maximum27°C
(80°F)		31°C
(88°F)		33°C
(92°F)		33°C
(91°F)		35°C
(95°F)		35°C
(94°F)		31°C
(89°F)		31°C
(87°F)		28°C
(84°F)		28°C
(83°F)		28°C
(83°F)		27°C
(81°F)
Mean maximum25°C
(77°F)		28°C
(83°F)		30°C
(86°F)		31°C
(87°F)		33°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
(80°F)		25°C
(78°F)
Average high20°C
(69°F)		23°C
(73°F)		26°C
(79°F)		28°C
(82°F)		29°C
(85°F)		28°C
(82°F)		26°C
(79°F)		26°C
(79°F)		24°C
(75°F)		24°C
(76°F)		23°C
(74°F)		21°C
(70°F)
Daily mean12°C
(55°F)		15°C
(59°F)		18°C
(65°F)		20°C
(68°F)		22°C
(72°F)		21°C
(71°F)		20°C
(68°F)		20°C
(69°F)		18°C
(65°F)		17°C
(64°F)		15°C
(59°F)		13°C
(55°F)
Average low6°C
(42°F)		8°C
(46°F)		10°C
(50°F)		12°C
(53°F)		14°C
(57°F)		15°C
(59°F)		14°C
(58°F)		14°C
(58°F)		14°C
(57°F)		12°C
(53°F)		8°C
(47°F)		6°C
(43°F)
Mean minimum0°C
(33°F)		3°C
(37°F)		6°C
(43°F)		7°C
(45°F)		10°C
(50°F)		13°C
(56°F)		12°C
(54°F)		13°C
(55°F)		11°C
(52°F)		7°C
(45°F)		2°C
(36°F)		-1°C
(30°F)
Minimum-2°C
(29°F)		1°C
(34°F)		4°C
(39°F)		5°C
(41°F)		9°C
(48°F)		10°C
(51°F)		12°C
(53°F)		11°C
(52°F)		9°C
(49°F)		5°C
(41°F)		-2°C
(28°F)		-7°C
(19°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 June, July and September, with an average of 13 rainy days and 105 mm (4.1 inches) of precipitation per month. The driest months in San Juan are February, March and April. On average, 7 mm (0.3 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)17 (0.7)9 (0.3)5 (0.2)7 (0.3)19 (0.8)77 (3.0)120 (4.7)65 (2.6)119 (4.7)42 (1.7)15 (0.6)12 (0.5)
Average precipitation days (≥ 1 mm)211241113715621

Monthly sunshine hours in San Juan, Mexico

The sunniest months in San Juan are May, June and July, when the sun shines an average of 11 hours 9 minutes a day. Least sunny months in San Juan: January, February and December receive an average of 8 hours 30 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 hours228265314326350338337337294295280280
Mean daily daylight hours10h 53m11h 23m12h 1m12h 41m13h 14m13h 30m13h 21m12h 52m12h 14m11h 34m11h 1m10h 44m

Solar UV radiation in San Juan, Mexico

San Juan 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 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)8111314151414141412108