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May Weather in San Juan, Mexico

Last updated: August 27, 2025

In May, the average temperature in San Juan, Mexico hovers around 27°C (81°F). Expect a minimum of 16°C (61°F) and a maximum of 37°C (99°F), providing a warm climate ideal for various activities. Precipitation averages 60 mm (2.4 in) over the course of 6 days, while the average humidity remains at 67%, ensuring a pleasant balance in the air. Enjoy the warmth and charm of this beautiful destination!

May Temperature in San Juan

In May in San Juan, the average temperature is 27°C (81°F). The maximum can reach 37°C (99°F), while the minimum can be as low as 16°C (61°F). This makes San Juan an ideal destination for travelers seeking warm weather and pleasant outdoor activities.

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 27°C (81°F), with highs reaching up to 37°C (99°F) and lows dropping to around 16°C (61°F).
JanFebMarAprMayJunJulAugSepOctNovDec717378808177777675757270
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 60 mm (2.4 in) spread over 6 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 60 mm (2.4 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec232060318344445396231432
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 67%. With an average temperature of 27°C (81°F), this humidity feels like a warm, sticky embrace, making outdoor activities feel more strenuous and prompting travelers to seek shade and hydration frequently.

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 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec70%65%59%60%67%80%81%83%83%80%77%76%
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.
JanFebMarAprMayJunJulAugSepOctNovDec911131313141313131198
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 Weather22°C (71°F)2 mm (0.1 inches)70%very high
February Weather23°C (74°F)3 mm (0.1 inches)65%extreme
March Weather25°C (78°F)2 mm (0.1 inches)59%extreme
April Weather27°C (80°F)0 mm (0.0 inches)60%extreme
May Weather27°C (81°F)60 mm (2.4 inches)67%extreme
June Weather25°C (78°F)318 mm (12.5 inches)80%extreme
July Weather25°C (77°F)344 mm (13.5 inches)81%extreme
August Weather24°C (76°F)445 mm (17.5 inches)83%extreme
September Weather24°C (75°F)396 mm (15.6 inches)83%extreme
October Weather24°C (75°F)231 mm (9.1 inches)80%extreme
November Weather22°C (73°F)43 mm (1.7 inches)77%very high
December Weather21°C (70°F)2 mm (0.1 inches)76%very high

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