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Monthly climate in Union, Paraguay

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Union features a humid subtropical climate (Cfa). Temperatures typically range between 18 °C (65 °F) and 28 °C (82 °F) through the year, but rarely can drop to 0 °C (33 °F) or can rise to as high as 41 °C (106 °F). The average annual precipitation amounts to about 1344 mm (52.9 inches) and receives 111 rainy days on the 1 mm (0.04 inches) threshold annually. Union enjoys an average of 3470 hours of sunshine throughout the year, and daylight varies from 10 hours 36 minutes to 13 hours 38 minutes per day.

Monthly average temperatures in Union, Paraguay

The warmest months in Union are January, February and December, with daily mean temperatures ranging from 27 to 28 °C (81 - 82 °F) throughout the day. The coldest temperatures usually occur in May, June and July, when daily mean temperatures range from 18 to 20 °C (65 - 69 °F) throughout the day. On average each year, Union experiences 264 days above 25 °C (77.0 °F) and 0 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
Maximum41°C
(106°F)		39°C
(102°F)		39°C
(102°F)		36°C
(96°F)		35°C
(95°F)		32°C
(90°F)		34°C
(93°F)		38°C
(101°F)		41°C
(106°F)		41°C
(106°F)		39°C
(102°F)		39°C
(103°F)
Mean maximum37°C
(99°F)		37°C
(99°F)		37°C
(98°F)		34°C
(94°F)		32°C
(90°F)		29°C
(84°F)		33°C
(91°F)		37°C
(99°F)		39°C
(103°F)		39°C
(102°F)		37°C
(99°F)		37°C
(99°F)
Average high33°C
(91°F)		32°C
(91°F)		32°C
(89°F)		29°C
(84°F)		26°C
(78°F)		24°C
(75°F)		25°C
(77°F)		27°C
(81°F)		30°C
(87°F)		31°C
(87°F)		32°C
(89°F)		33°C
(91°F)
Daily mean28°C
(82°F)		27°C
(81°F)		26°C
(79°F)		23°C
(74°F)		20°C
(69°F)		19°C
(66°F)		18°C
(65°F)		20°C
(69°F)		24°C
(75°F)		25°C
(77°F)		26°C
(79°F)		27°C
(81°F)
Average low23°C
(74°F)		22°C
(72°F)		21°C
(71°F)		19°C
(67°F)		16°C
(61°F)		15°C
(59°F)		13°C
(56°F)		15°C
(59°F)		18°C
(65°F)		20°C
(68°F)		21°C
(70°F)		22°C
(72°F)
Mean minimum19°C
(67°F)		17°C
(63°F)		16°C
(61°F)		13°C
(55°F)		9°C
(48°F)		6°C
(43°F)		3°C
(37°F)		6°C
(42°F)		11°C
(52°F)		14°C
(58°F)		17°C
(62°F)		17°C
(63°F)
Minimum16°C
(62°F)		15°C
(59°F)		13°C
(56°F)		9°C
(49°F)		6°C
(42°F)		2°C
(35°F)		0°C
(33°F)		3°C
(37°F)		10°C
(50°F)		11°C
(52°F)		15°C
(60°F)		15°C
(59°F)

Compare climate in Union with other places

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

Monthly average precipitation in Union, Paraguay

Union usually has the most precipitation in January, October and December, with an average of 12 rainy days and 162 mm (6.4 inches) of precipitation per month. The driest months in Union are July, August and September. On average, 57 mm (2.3 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)142 (5.6)102 (4.0)102 (4.0)137 (5.4)120 (4.7)88 (3.5)36 (1.4)66 (2.6)70 (2.8)194 (7.6)136 (5.4)150 (5.9)
Average precipitation days (≥ 1 mm)1311118119456121011

Monthly sunshine hours in Union, Paraguay

The sunniest months in Union are March, November and December, when the sun shines an average of 10 hours 43 minutes a day. Least sunny months in Union: January, May and June receive an average of 8 hours 14 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 hours271307309289252233278281275293319356
Mean daily daylight hours13h 27m12h 54m12h 11m11h 28m10h 53m10h 36m10h 45m11h 16m11h 57m12h 40m13h 18m13h 38m

Solar UV radiation in Union, Paraguay

Union 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 High exposure category. In these months, the maximum values of the UV index do not exceed 7. 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)15141311767810131415