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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 12 °C (54 °F) and 26 °C (79 °F) through the year, but rarely can drop to -4 °C (25 °F) or can rise to as high as 41 °C (106 °F). The average annual precipitation amounts to about 1077 mm (42.4 inches) and receives 76 rainy days on the 1 mm (0.04 inches) threshold annually. San Justo enjoys an average of 3433 hours of sunshine throughout the year, and daylight varies from 10 hours 10 minutes to 14 hours 5 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 24 to 26 °C (76 - 79 °F) throughout the day. The coldest temperatures usually occur in June, July and August, when daily mean temperatures range from 12 to 14 °C (54 - 57 °F) throughout the day. On average each year, San Justo experiences 176 days above 25 °C (77.0 °F) and 4 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)		39°C
(103°F)		37°C
(99°F)		35°C
(95°F)		31°C
(88°F)		28°C
(83°F)		30°C
(86°F)		34°C
(93°F)		36°C
(98°F)		39°C
(102°F)		39°C
(103°F)		39°C
(102°F)
Mean maximum38°C
(100°F)		36°C
(97°F)		34°C
(94°F)		32°C
(90°F)		28°C
(82°F)		25°C
(77°F)		28°C
(83°F)		31°C
(89°F)		34°C
(93°F)		35°C
(95°F)		37°C
(99°F)		37°C
(99°F)
Average high31°C
(88°F)		30°C
(87°F)		28°C
(83°F)		26°C
(78°F)		21°C
(70°F)		18°C
(65°F)		18°C
(64°F)		21°C
(70°F)		23°C
(73°F)		25°C
(78°F)		28°C
(84°F)		31°C
(88°F)
Daily mean26°C
(79°F)		24°C
(76°F)		22°C
(72°F)		20°C
(68°F)		16°C
(60°F)		13°C
(55°F)		12°C
(54°F)		14°C
(57°F)		17°C
(63°F)		20°C
(67°F)		23°C
(73°F)		25°C
(77°F)
Average low20°C
(69°F)		19°C
(66°F)		17°C
(63°F)		15°C
(59°F)		11°C
(52°F)		8°C
(47°F)		7°C
(45°F)		8°C
(47°F)		12°C
(53°F)		14°C
(57°F)		17°C
(62°F)		18°C
(65°F)
Mean minimum14°C
(58°F)		12°C
(53°F)		11°C
(52°F)		8°C
(46°F)		3°C
(38°F)		-1°C
(31°F)		-3°C
(28°F)		0°C
(33°F)		4°C
(40°F)		6°C
(43°F)		10°C
(50°F)		12°C
(54°F)
Minimum13°C
(55°F)		10°C
(50°F)		9°C
(48°F)		3°C
(38°F)		2°C
(35°F)		-2°C
(29°F)		-4°C
(25°F)		-1°C
(30°F)		2°C
(35°F)		4°C
(39°F)		8°C
(47°F)		11°C
(52°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 January, February and May, with an average of 8 rainy days and 124 mm (4.9 inches) of precipitation per month. The driest months in San Justo are June, July and September. On average, 54 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)130 (5.1)123 (4.8)105 (4.1)97 (3.8)117 (4.6)60 (2.4)44 (1.7)62 (2.5)59 (2.3)111 (4.4)86 (3.4)82 (3.2)
Average precipitation days (≥ 1 mm)887785456765

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 25 minutes a day. Least sunny months in San Justo: May, June and July receive an average of 7 hours 18 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 hours284314307277223216231284272306339374
Mean daily daylight hours13h 51m13h 8m12h 13m11h 17m10h 32m10h 10m10h 22m11h 2m11h 54m12h 51m13h 40m14h 5m

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 14 - 14, 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 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)141312964569111414