December Weather in Buenos Aires, Costa Rica

Last updated: August 23, 2025

In December, the average temperature in Buenos Aires, Costa Rica reaches a pleasant 19°C (66°F). Expect lows of 12°C (54°F) and highs of 25°C (78°F), making it a comfortable time to explore. With an average humidity of 72%, the air feels fresh, while 86 mm (3.4 in) of precipitation over 14 days keeps the landscape lush. Pack accordingly for a delightful experience!

December Temperature in Buenos Aires

In December in Buenos Aires, the average temperature is 19°C (66°F). The maximum can reach 25°C (78°F), while the minimum can be as low as 12°C (54°F). It's a great time to explore Buenos Aires, as the mild weather is perfect for outdoor activities and sightseeing.

December Weather in Buenos Aires: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Buenos Aires, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Buenos Aires, December typically has an average temperature of 19°C (66°F), with highs reaching up to 25°C (78°F) and lows dropping to around 12°C (54°F).

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

December Precipitation in Buenos Aires

In Buenos Aires in December, the precipitation amount is 86 mm (3.4 in) over the course of 14 days.

December Precipitation Trends in Buenos Aires

The chart displays monthly precipitation patterns in Buenos Aires, 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 Buenos Aires, December typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 14 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 Buenos Aires

In Buenos Aires in December, humidity is 72%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace that can make even the lightest activities feel strenuous for traveling.

December Average Humidity in Buenos Aires

This chart illustrates the average monthly humidity levels in Buenos Aires, 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 Buenos Aires is approximately 72%, 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 Buenos Aires

In Buenos Aires in December, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Buenos Aires.

Maximum UV Index Levels in Buenos Aires for December

The chart shows the monthly maximum UV Index (UVI) for Buenos Aires 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 Buenos Aires typically reaches 11, which falls under the extreme exposure category.

Data source: Buenos Aires 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 Buenos Aires Compares to Other Months

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

This table compares monthly weather conditions in Buenos Aires, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	19°C (66°F)	50 mm (2.0 inches)	68%	extreme
February Weather	19°C (66°F)	42 mm (1.6 inches)	68%	extreme
March Weather	19°C (67°F)	35 mm (1.4 inches)	66%	extreme
April Weather	20°C (68°F)	113 mm (4.5 inches)	67%	extreme
May Weather	20°C (68°F)	397 mm (15.6 inches)	69%	extreme
June Weather	20°C (68°F)	288 mm (11.4 inches)	84%	extreme
July Weather	20°C (68°F)	237 mm (9.3 inches)	85%	extreme
August Weather	20°C (67°F)	354 mm (13.9 inches)	82%	extreme
September Weather	19°C (67°F)	299 mm (11.8 inches)	81%	extreme
October Weather	19°C (67°F)	490 mm (19.3 inches)	80%	extreme
November Weather	19°C (67°F)	304 mm (12.0 inches)	80%	extreme
December Weather	19°C (66°F)	86 mm (3.4 inches)	72%	extreme