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Monthly climate in San Juan, Argentina

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification San Juan features a cold desert climate (BWk).Temperatures typically range between 9 °C (48 °F) and 27 °C (80 °F) through the year, but rarely can drop to -5 °C (24 °F) or can rise to as high as 42 °C (108 °F).The average annual precipitation amounts to about 154 mm (6.0 inches) and receives 29 rainy days on the 1 mm (0.04 inches) threshold annually.San Juan enjoys an average of 3860 hours of sunshine throughout the year, and daylight varies from 10 hours 6 minutes to 14 hours 8 minutes per day.

Monthly average temperatures in San Juan, Argentina §

The warmest months in San Juan are January, February and December, with daily mean temperatures ranging from 25 to 27 °C (77 - 80 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 9 to 12 °C (48 - 54 °F) throughout the day. On average each year, San Juan experiences 186 days above 25 °C (77.0 °F) and 12 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, Argentina.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 41°C
(106°F)		 40°C
(105°F)		 39°C
(103°F)		 35°C
(96°F)		 29°C
(85°F)		 28°C
(82°F)		 26°C
(78°F)		 34°C
(94°F)		 37°C
(100°F)		 38°C
(100°F)		 38°C
(100°F)		 42°C
(108°F)
Mean maximum 40°C
(104°F)		 38°C
(101°F)		 37°C
(98°F)		 33°C
(92°F)		 27°C
(82°F)		 24°C
(75°F)		 25°C
(78°F)		 31°C
(88°F)		 35°C
(95°F)		 36°C
(98°F)		 36°C
(98°F)		 40°C
(105°F)
Average high 33°C
(92°F)		 31°C
(89°F)		 29°C
(85°F)		 26°C
(79°F)		 21°C
(70°F)		 18°C
(64°F)		 17°C
(63°F)		 21°C
(70°F)		 24°C
(75°F)		 27°C
(81°F)		 30°C
(86°F)		 32°C
(89°F)
Daily mean 27°C
(80°F)		 25°C
(77°F)		 22°C
(72°F)		 18°C
(65°F)		 14°C
(57°F)		 9°C
(49°F)		 9°C
(48°F)		 12°C
(54°F)		 16°C
(61°F)		 19°C
(67°F)		 23°C
(73°F)		 25°C
(77°F)
Average low 20°C
(68°F)		 18°C
(65°F)		 15°C
(60°F)		 12°C
(53°F)		 7°C
(45°F)		 3°C
(37°F)		 2°C
(36°F)		 4°C
(40°F)		 9°C
(48°F)		 12°C
(54°F)		 15°C
(60°F)		 18°C
(64°F)
Mean minimum 13°C
(56°F)		 13°C
(55°F)		 9°C
(48°F)		 6°C
(43°F)		 1°C
(33°F)		 -2°C
(29°F)		 -3°C
(26°F)		 -1°C
(30°F)		 1°C
(35°F)		 4°C
(39°F)		 9°C
(49°F)		 12°C
(53°F)
Minimum 10°C
(51°F)		 12°C
(53°F)		 6°C
(43°F)		 4°C
(39°F)		 -2°C
(29°F)		 -4°C
(25°F)		 -5°C
(24°F)		 -4°C
(25°F)		 0°C
(32°F)		 2°C
(36°F)		 6°C
(44°F)		 10°C
(50°F)

Compare climate in San Juan with other places

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

Monthly average precipitation in San Juan, Argentina §

San Juan usually has the most precipitation in January, February and December, with an average of 2 rainy days and 18 mm (0.7 inches) of precipitation per month.The driest months in San Juan are June, July and August. On average, 6 mm (0.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in San Juan, Argentina.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 19 (0.8) 17 (0.7) 17 (0.7) 15 (0.6) 11 (0.4) 6 (0.2) 8 (0.3) 3 (0.1) 12 (0.5) 13 (0.5) 14 (0.5) 18 (0.7)
Average precipitation days (≥ 1 mm) 2 3 3 3 4 2 2 0 2 3 2 3

Monthly sunshine hours in San Juan, Argentina §

The sunniest months in San Juan are October, November and December, when the sun shines an average of 12 hours 7 minutes a day.Least sunny months in San Juan: May, June and July receive an average of 9 hours 9 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in San Juan, Argentina.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 310 322 337 289 277 275 289 316 325 353 371 390
Mean daily daylight hours 13h 54m 13h 10m 12h 13m 11h 16m 10h 29m 10h 6m 10h 19m 11h 0m 11h 54m 12h 52m 13h 42m 14h 8m

Solar UV radiation in San Juan, Argentina §

San Juan experiences the highest level of ultraviolet (UV) radiation in January, November and December, when the maximum UV index can reach values of 14 - 15, which corresponds to the Extreme category of sun exposure.May, June and July are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly San Juan UV Index data.

Average daily maximum UV levels by month for San Juan, Argentina.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 15 14 12 9 6 4 5 7 9 12 14 15