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Monthly climate in San Juan, Peru

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification San Juan features a ice cap climate ET). Temperatures typically range between 6 °C (43 °F) and 8 °C (47 °F) through the year, but rarely can drop to -8 °C (18 °F) or can rise to as high as 19 °C (67 °F). The average annual precipitation amounts to about 1613 mm (63.5 inches) and receives 214 rainy days on the 1 mm (0.04 inches) threshold annually. San Juan enjoys an average of 3767 hours of sunshine throughout the year, and daylight varies from 11 hours 15 minutes to 12 hours 58 minutes per day.

Monthly average temperatures in San Juan, Peru

The warmest months in San Juan are January, February and December, with daily mean temperatures ranging from 8 to 8 °C (47 - 47 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 6 to 6 °C (43 - 44 °F) throughout the day. On average each year, San Juan experiences 0 days above 25 °C (77.0 °F) and 111 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
Maximum19°C
(66°F)		17°C
(63°F)		18°C
(64°F)		18°C
(65°F)		17°C
(63°F)		18°C
(64°F)		18°C
(65°F)		19°C
(67°F)		19°C
(66°F)		18°C
(65°F)		19°C
(67°F)		19°C
(67°F)
Mean maximum17°C
(62°F)		16°C
(61°F)		16°C
(60°F)		17°C
(62°F)		16°C
(61°F)		15°C
(60°F)		17°C
(62°F)		17°C
(62°F)		18°C
(64°F)		17°C
(63°F)		17°C
(63°F)		17°C
(62°F)
Average high13°C
(56°F)		13°C
(56°F)		13°C
(56°F)		14°C
(57°F)		14°C
(57°F)		14°C
(57°F)		14°C
(57°F)		14°C
(58°F)		15°C
(59°F)		14°C
(58°F)		14°C
(58°F)		14°C
(57°F)
Daily mean8°C
(47°F)		8°C
(47°F)		8°C
(47°F)		7°C
(46°F)		6°C
(44°F)		6°C
(43°F)		6°C
(43°F)		6°C
(44°F)		7°C
(46°F)		8°C
(46°F)		8°C
(47°F)		8°C
(47°F)
Average low5°C
(41°F)		5°C
(40°F)		5°C
(40°F)		2°C
(35°F)		-1°C
(31°F)		-1°C
(30°F)		-2°C
(29°F)		-1°C
(30°F)		1°C
(34°F)		1°C
(34°F)		2°C
(36°F)		3°C
(38°F)
Mean minimum1°C
(34°F)		1°C
(33°F)		0°C
(32°F)		-4°C
(25°F)		-5°C
(23°F)		-6°C
(22°F)		-6°C
(22°F)		-6°C
(22°F)		-4°C
(26°F)		-4°C
(25°F)		-3°C
(28°F)		-2°C
(29°F)
Minimum-2°C
(29°F)		-2°C
(28°F)		-2°C
(29°F)		-6°C
(21°F)		-7°C
(20°F)		-8°C
(18°F)		-8°C
(19°F)		-8°C
(18°F)		-5°C
(24°F)		-6°C
(22°F)		-4°C
(25°F)		-4°C
(25°F)

Compare climate in San Juan with other places

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

Monthly average precipitation in San Juan, Peru

San Juan usually has the most precipitation in January, February and March, with an average of 27 rainy days and 282 mm (11.1 inches) of precipitation per month. The driest months in San Juan are June, July and August. On average, 42 mm (1.7 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)254 (10.0)268 (10.6)323 (12.7)142 (5.6)72 (2.8)49 (1.9)41 (1.6)35 (1.4)93 (3.7)106 (4.2)83 (3.3)146 (5.7)
Average precipitation days (≥ 1 mm)252630231498817161523

Monthly sunshine hours in San Juan, Peru

The sunniest months in San Juan are August, October and November, when the sun shines an average of 11 hours 17 minutes a day. Least sunny months in San Juan: January, February and March receive an average of 8 hours 25 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 hours228255282310333321334343336354340326
Mean daily daylight hours12h 52m12h 33m12h 8m11h 44m11h 24m11h 15m11h 20m11h 37m12h 0m12h 25m12h 47m12h 58m

Solar UV radiation in San Juan, Peru

San Juan experiences the highest level of ultraviolet (UV) radiation in March, November and December, when the maximum UV index can reach values of 18 - 18, which corresponds to the Extreme category of sun exposure. May, June and July are in the Extreme exposure category. In these months, the maximum values of the UV index do not exceed 13. 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)181818161311121416171818