May Weather in San Juan, Argentina

Last updated: August 22, 2025

In May, the average temperature in San Juan, Argentina hovers around 14°C (57°F). Expect a range from a chilly -2°C (29°F) at night to a warm 29°C (85°F) during the day. This month typically brings about 11 mm (0.4 in) of precipitation spread over 4 days, contributing to an average humidity level of 66%.

May Temperature in San Juan

In May in San Juan, the average temperature is 14°C (57°F). Maximums can reach 29°C (85°F), while minimums can dip to as low as -2°C (29°F). Be prepared for a wide range of temperatures during your travels!

May Weather in San Juan: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in San Juan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Juan, May typically has an average temperature of 14°C (57°F), with highs reaching up to 29°C (85°F) and lows dropping to around -2°C (29°F).

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

May Precipitation in San Juan

In San Juan in May, the precipitation amount is 11 mm (0.4 in) spread over 4 days.

May Precipitation Trends in San Juan

The chart displays monthly precipitation patterns in San Juan, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In San Juan, May typically receives around 11 mm (0.4 inches) of precipitation spread over approximately 4 days.

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

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Millimeters (mm) Inches (in)

May Humidity in San Juan

In San Juan in May humidity is 66%. With an average temperature of 14°C (57°F), this humidity feels like a warm, enveloping hug, making it pleasant for strolling through the streets, though a light jacket might be needed to stay comfortable while exploring.

May Average Humidity in San Juan

This chart illustrates the average monthly humidity levels in San Juan, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in San Juan is approximately 66%, offering insight into how humid the weather typically is during this month.

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

May UV Index in San Juan

In San Juan in May, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in San Juan, you can refer to this Hourly UV Index in San Juan.

Maximum UV Index Levels in San Juan for May

The chart shows the monthly maximum UV Index (UVI) for San Juan in May, 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 May, the maximum UV index in San Juan typically reaches 6, which falls under the high exposure category.

Data source: San Juan May 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 May Weather in San Juan Compares to Other Months

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

This table compares monthly weather conditions in San Juan, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	27°C (80°F)	19 mm (0.8 inches)	44%	extreme
February Weather	25°C (77°F)	17 mm (0.7 inches)	48%	extreme
March Weather	22°C (72°F)	17 mm (0.7 inches)	56%	extreme
April Weather	18°C (65°F)	15 mm (0.6 inches)	67%	very high
May Weather	14°C (57°F)	11 mm (0.4 inches)	66%	high
June Weather	9°C (49°F)	6 mm (0.2 inches)	58%	moderate
July Weather	9°C (48°F)	8 mm (0.3 inches)	58%	moderate
August Weather	12°C (54°F)	3 mm (0.1 inches)	52%	high
September Weather	16°C (61°F)	12 mm (0.5 inches)	45%	very high
October Weather	19°C (67°F)	13 mm (0.5 inches)	43%	extreme
November Weather	23°C (73°F)	14 mm (0.5 inches)	41%	extreme
December Weather	25°C (77°F)	18 mm (0.7 inches)	37%	extreme