January Weather in Buenos Aires, Costa Rica

Last updated: August 23, 2025

In Buenos Aires, Costa Rica, the average temperature in January is a pleasant 19°C (66°F). Expect a range where the temperature can dip to a minimum of 12°C (53°F) and reach a maximum of 26°C (78°F). During this month, anticipate approximately 50 mm (2.0 in) of precipitation spread over 9 days, contributing to an average humidity level of 68%. Perfect for those who enjoy a mild and refreshing climate!

January Temperature in Buenos Aires

In January in Buenos Aires, the average temperature is 19°C (66°F), with a maximum that can reach 26°C (78°F) and a minimum that can be as low as 12°C (53°F). This mild climate makes Buenos Aires an ideal destination for outdoor activities and sightseeing.

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

The chart illustrates January 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, January typically has an average temperature of 19°C (66°F), with highs reaching up to 26°C (78°F) and lows dropping to around 12°C (53°F).

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

January Precipitation in Buenos Aires

In Buenos Aires in January, the precipitation amount is 50 mm (2.0 in) over the course of 9 days.

January Precipitation Trends in Buenos Aires

The chart displays monthly precipitation patterns in Buenos Aires, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Buenos Aires, January typically receives around 50 mm (2.0 inches) of precipitation spread over approximately 9 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Buenos Aires

In Buenos Aires in January humidity is 68%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, creating a sticky atmosphere that can be a bit uncomfortable for traveling.

January Average Humidity in Buenos Aires

This chart illustrates the average monthly humidity levels in Buenos Aires, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Buenos Aires is approximately 68%, offering insight into how humid the weather typically is during this month.

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

January UV Index in Buenos Aires

In Buenos Aires in January, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Buenos Aires.

Maximum UV Index Levels in Buenos Aires for January

The chart shows the monthly maximum UV Index (UVI) for Buenos Aires in January, 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 January, the maximum UV index in Buenos Aires typically reaches 13, which falls under the extreme exposure category.

Data source: Buenos Aires January 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 January 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 January’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 January’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