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Monthly climate in Union, Argentina

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Union features a humid subtropical climate (Cfa). Temperatures typically range between 9 °C (48 °F) and 26 °C (79 °F) through the year, but rarely can drop to -5 °C (24 °F) or can rise to as high as 45 °C (113 °F). The average annual precipitation amounts to about 492 mm (19.4 inches) and receives 59 rainy days on the 1 mm (0.04 inches) threshold annually. Union enjoys an average of 3583 hours of sunshine throughout the year, and daylight varies from 9 hours 48 minutes to 14 hours 28 minutes per day.

Monthly average temperatures in Union, Argentina

The warmest months in Union are January, February and December, with daily mean temperatures ranging from 25 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 9 to 12 °C (48 - 53 °F) throughout the day. On average each year, Union experiences 159 days above 25 °C (77.0 °F) and 9 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Union. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum45°C
(113°F)		42°C
(109°F)		39°C
(102°F)		34°C
(93°F)		33°C
(92°F)		26°C
(78°F)		27°C
(81°F)		32°C
(90°F)		35°C
(96°F)		39°C
(102°F)		39°C
(103°F)		42°C
(109°F)
Mean maximum41°C
(106°F)		40°C
(104°F)		37°C
(99°F)		31°C
(89°F)		27°C
(81°F)		21°C
(70°F)		23°C
(74°F)		29°C
(84°F)		32°C
(90°F)		35°C
(96°F)		38°C
(101°F)		41°C
(105°F)
Average high33°C
(92°F)		32°C
(90°F)		29°C
(84°F)		24°C
(76°F)		19°C
(67°F)		16°C
(60°F)		15°C
(60°F)		20°C
(67°F)		22°C
(71°F)		25°C
(76°F)		28°C
(84°F)		32°C
(89°F)
Daily mean26°C
(79°F)		25°C
(77°F)		21°C
(71°F)		18°C
(64°F)		13°C
(56°F)		9°C
(48°F)		9°C
(48°F)		12°C
(53°F)		15°C
(59°F)		18°C
(64°F)		21°C
(71°F)		25°C
(76°F)
Average low19°C
(66°F)		18°C
(65°F)		15°C
(59°F)		12°C
(54°F)		8°C
(46°F)		4°C
(39°F)		3°C
(38°F)		5°C
(41°F)		8°C
(47°F)		11°C
(52°F)		14°C
(58°F)		17°C
(63°F)
Mean minimum12°C
(54°F)		11°C
(52°F)		7°C
(44°F)		6°C
(43°F)		1°C
(34°F)		-2°C
(28°F)		-4°C
(25°F)		-2°C
(29°F)		0°C
(33°F)		3°C
(38°F)		8°C
(47°F)		11°C
(53°F)
Minimum8°C
(48°F)		9°C
(49°F)		4°C
(39°F)		3°C
(37°F)		-4°C
(26°F)		-5°C
(24°F)		-4°C
(24°F)		-4°C
(25°F)		-4°C
(24°F)		1°C
(34°F)		7°C
(44°F)		11°C
(52°F)

Compare climate in Union with other places

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

Monthly average precipitation in Union, Argentina

Union usually has the most precipitation in March, November and December, with an average of 6 rainy days and 63 mm (2.5 inches) of precipitation per month. The driest months in Union are June, July and August. On average, 17 mm (0.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Union. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)54 (2.1)28 (1.1)65 (2.6)57 (2.2)38 (1.5)24 (0.9)17 (0.7)10 (0.4)37 (1.5)37 (1.5)66 (2.6)58 (2.3)
Average precipitation days (≥ 1 mm)756742215677

Monthly sunshine hours in Union, Argentina

The sunniest months in Union are October, November and December, when the sun shines an average of 11 hours 39 minutes a day. Least sunny months in Union: April, May and June receive an average of 7 hours 45 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Union. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours314328326246230228250292293336351384
Mean daily daylight hours14h 11m13h 20m12h 14m11h 9m10h 14m9h 48m10h 2m10h 50m11h 53m12h 59m13h 58m14h 28m

Solar UV radiation in Union, Argentina

Union 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 exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Union UV Index data.

Average daily maximum UV levels by month for Union. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)141311753468111414