December Weather in Union, Paraguay

Last updated: August 31, 2025

In December, the average temperature in Union, Paraguay hovers around 27°C (81°F), with minimums dipping to 15°C (59°F) and maximums soaring up to 39°C (103°F). Expect about 150 mm (5.9 in) of precipitation spread over 11 days, accompanied by an average humidity of 84%.

December Temperature in Union

In December in Union, the average temperature is 27°C (81°F). Maximums can reach 39°C (103°F), while minimums can drop to as low as 15°C (59°F). It's a great time to travel for those who enjoy warm weather, but be sure to pack for both the heat and cooler evenings.

December Weather in Union: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Union, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Union, December typically has an average temperature of 27°C (81°F), with highs reaching up to 39°C (103°F) and lows dropping to around 15°C (59°F).

Data source: Temperature data for Union generated using information from the Copernicus Climate Change Service.

December Precipitation in Union

In Union in December, the total precipitation amount reaches 150 mm (5.9 in) over the course of 11 days.

December Precipitation Trends in Union

The chart displays monthly precipitation patterns in Union, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Union, December typically receives around 150 mm (5.9 inches) of precipitation spread over approximately 11 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Union

In Union in December humidity is 84%. With an average temperature of 27°C (81°F), this humidity feels like walking through a warm, moist blanket, making travel uncomfortable and sticky, as every step seems to weigh you down with the heavy air.

December Average Humidity in Union

This chart illustrates the average monthly humidity levels in Union, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Union is approximately 84%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Union

In Union in December, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in Union.

Maximum UV Index Levels in Union for December

The chart shows the monthly maximum UV Index (UVI) for Union in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Union typically reaches 15, which falls under the extreme exposure category.

Data source: Union December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How December Weather in Union Compares to Other Months

Weather in Union varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Union, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Union, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	28°C (82°F)	142 mm (5.6 inches)	80%	extreme
February Weather	27°C (81°F)	102 mm (4.0 inches)	75%	extreme
March Weather	26°C (79°F)	102 mm (4.0 inches)	76%	extreme
April Weather	23°C (74°F)	137 mm (5.4 inches)	76%	extreme
May Weather	20°C (69°F)	120 mm (4.7 inches)	75%	high
June Weather	19°C (66°F)	88 mm (3.5 inches)	65%	high
July Weather	18°C (65°F)	36 mm (1.4 inches)	60%	high
August Weather	20°C (69°F)	66 mm (2.6 inches)	43%	very high
September Weather	24°C (75°F)	70 mm (2.8 inches)	47%	very high
October Weather	25°C (77°F)	194 mm (7.6 inches)	52%	extreme
November Weather	26°C (79°F)	136 mm (5.4 inches)	71%	extreme
December Weather	27°C (81°F)	150 mm (5.9 inches)	84%	extreme