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Monthly climate in San Justo, Argentina

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification San Justo features a humid subtropical climate (Cfa). Temperatures typically range between 10 °C (51 °F) and 24 °C (76 °F) through the year, but rarely can drop to -2 °C (29 °F) or can rise to as high as 41 °C (106 °F). The average annual precipitation amounts to about 817 mm (32.2 inches) and receives 83 rainy days on the 1 mm (0.04 inches) threshold annually. San Justo enjoys an average of 3404 hours of sunshine throughout the year, and daylight varies from 9 hours 51 minutes to 14 hours 25 minutes per day.

Monthly average temperatures in San Justo, Argentina

The warmest months in San Justo are January, February and December, with daily mean temperatures ranging from 23 to 24 °C (73 - 76 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 10 to 12 °C (51 - 54 °F) throughout the day. On average each year, San Justo experiences 112 days above 25 °C (77.0 °F) and 1 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 Justo. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum41°C
(106°F)		36°C
(97°F)		34°C
(93°F)		31°C
(87°F)		27°C
(82°F)		25°C
(78°F)		26°C
(79°F)		26°C
(79°F)		29°C
(84°F)		33°C
(92°F)		35°C
(96°F)		37°C
(99°F)
Mean maximum36°C
(97°F)		34°C
(94°F)		32°C
(90°F)		28°C
(84°F)		25°C
(78°F)		20°C
(69°F)		23°C
(74°F)		24°C
(76°F)		27°C
(81°F)		29°C
(85°F)		33°C
(91°F)		34°C
(94°F)
Average high29°C
(84°F)		28°C
(82°F)		26°C
(79°F)		23°C
(74°F)		19°C
(66°F)		16°C
(61°F)		14°C
(58°F)		17°C
(62°F)		19°C
(66°F)		21°C
(70°F)		25°C
(77°F)		28°C
(82°F)
Daily mean24°C
(76°F)		23°C
(74°F)		21°C
(70°F)		18°C
(65°F)		14°C
(58°F)		11°C
(53°F)		10°C
(51°F)		12°C
(54°F)		14°C
(58°F)		17°C
(62°F)		20°C
(69°F)		23°C
(73°F)
Average low20°C
(68°F)		18°C
(65°F)		17°C
(62°F)		14°C
(58°F)		10°C
(51°F)		8°C
(46°F)		7°C
(44°F)		8°C
(46°F)		10°C
(51°F)		12°C
(54°F)		15°C
(60°F)		17°C
(63°F)
Mean minimum12°C
(54°F)		11°C
(51°F)		10°C
(50°F)		7°C
(46°F)		4°C
(39°F)		0°C
(33°F)		-1°C
(31°F)		1°C
(34°F)		4°C
(40°F)		5°C
(42°F)		8°C
(47°F)		10°C
(51°F)
Minimum11°C
(53°F)		10°C
(50°F)		7°C
(46°F)		4°C
(39°F)		1°C
(35°F)		-1°C
(30°F)		-2°C
(29°F)		-1°C
(30°F)		1°C
(34°F)		4°C
(39°F)		6°C
(44°F)		8°C
(46°F)

Compare climate in San Justo with other places

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

Monthly average precipitation in San Justo, Argentina

San Justo usually has the most precipitation in April, September and October, with an average of 7 rainy days and 83 mm (3.3 inches) of precipitation per month. The driest months in San Justo are June, July and August. On average, 52 mm (2.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in San Justo. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)65 (2.6)66 (2.6)73 (2.9)80 (3.2)67 (2.7)56 (2.2)55 (2.2)46 (1.8)75 (3.0)94 (3.7)71 (2.8)67 (2.6)
Average precipitation days (≥ 1 mm)678777756977

Monthly sunshine hours in San Justo, Argentina

The sunniest months in San Justo are February, November and December, when the sun shines an average of 11 hours 37 minutes a day. Least sunny months in San Justo: May, June and July receive an average of 7 hours 11 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in San Justo. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours300322313258232218210262255305341383
Mean daily daylight hours14h 9m13h 18m12h 14m11h 10m10h 16m9h 51m10h 5m10h 51m11h 53m12h 58m13h 55m14h 25m

Solar UV radiation in San Justo, Argentina

San Justo experiences the highest level of ultraviolet (UV) radiation in January, November and December, when the maximum UV index can reach values of 13 - 14, which corresponds to the Extreme category of sun exposure. May, June and July are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly San Justo UV Index data.

Average daily maximum UV levels by month for San Justo. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)141211753468101314