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May Weather in San Juan, Peru

Last updated: August 27, 2025

The average temperature in San Juan, Peru during May hovers around 6°C (44°F). Daily conditions can vary, with a minimum dipping to -7°C (20°F) and a maximum reaching 17°C (63°F). Expect 72 mm (2.8 in) of precipitation spread over 14 days, accompanied by an average humidity level of 84%.

May Temperature in San Juan

In May in San Juan, the average temperature is 6°C (44°F). The maximum can reach 17°C (63°F), while the minimum can be as low as -7°C (20°F). Therefore, travelers should prepare for a range of temperatures and dress in layers to ensure comfort throughout the day.

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 6°C (44°F), with highs reaching up to 17°C (63°F) and lows dropping to around -7°C (20°F).
JanFebMarAprMayJunJulAugSepOctNovDec474747454443424345464647
Data source: Temperature data for San Juan generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in San Juan

In San Juan in May, the total precipitation amount is 72 mm (2.8 in) spread over the course of 14 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 72 mm (2.8 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec254268323142724941369310683146
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in San Juan

In San Juan in May humidity is 84%. With an average temperature of 6°C (44°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor activities less comfortable and necessitating layered clothing to stay warm and dry while exploring the area.

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 84%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%90%90%90%84%67%53%47%53%67%75%83%
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 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 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 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec181818161311121416171818
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.
 TemperaturePrecipitationHumidityUV
January Weather8°C (47°F)254 mm (10.0 inches)89%extreme
February Weather8°C (47°F)268 mm (10.6 inches)90%extreme
March Weather8°C (47°F)323 mm (12.7 inches)90%extreme
April Weather7°C (46°F)142 mm (5.6 inches)90%extreme
May Weather6°C (44°F)72 mm (2.8 inches)84%extreme
June Weather6°C (43°F)49 mm (1.9 inches)67%extreme
July Weather6°C (43°F)41 mm (1.6 inches)53%extreme
August Weather6°C (44°F)35 mm (1.4 inches)47%extreme
September Weather7°C (46°F)93 mm (3.7 inches)53%extreme
October Weather8°C (46°F)106 mm (4.2 inches)67%extreme
November Weather8°C (47°F)83 mm (3.3 inches)75%extreme
December Weather8°C (47°F)146 mm (5.7 inches)82%extreme

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