May weather forecast and climate
San Juan, PR

An old fort building and a view of the stunning San Juan city, Puerto Rico, with a clear view of the calm waterfront
An old fort building and a view of the stunning San Juan city, Puerto Rico, with a clear view of the calm waterfront

What is the temperature in May in San Juan?

In San Juan, in May, the average high-temperature is 87.4°F (30.8°C), and the average low-temperature is 76.3°F (24.6°C).

What is the average humidity in May in San Juan?

The average relative humidity in May is 74.9%.

How much does it rain in San Juan in May?

In San Juan, in May, it is raining for 15.7 days, with typically 7.2" (182mm) of accumulated precipitation.

What is the water temperature in May in San Juan?

In May, the average ocean temperature in San Juan, Puerto Rico, is 81.5°F (27.5°C). For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

What is the month with the highest UV index in San Juan?

March through September, with an average UV index of 12, are months with the highest UV index in San Juan.

What is the average UV index in May in San Juan?

In May, the average UV index is 12.
Average temperature in May - San Juan, PR
  • Average high temperature in May: 30.8°C

Warmest months (with the highest average high temperature) are August and September (31.8°C).
The month with the lowest average high temperature is January (28.4°C).

  • Average low temperature in May: 24.6°C

The month with the highest average low temperature is August (25.7°C).
Coldest months (with the lowest average low temperature) are January and February (22.2°C).

Average humidity in May - San Juan, PR
  • Average humidity in May: 74.9%

The month with the highest relative humidity is October (76.9%).
The month with the lowest relative humidity is March (71%).

Average rainfall in May - San Juan, PR
  • Average rainfall in May: 182mm

The wettest month (with the highest rainfall) is August (195mm).
The driest month (with the lowest rainfall) is March (79mm).

Average rainfall days in May - San Juan, PR
  • Average rainfall days in May: 15.7 days

Months with the highest number of rainy days are November and December (19.6 days).
The month with the lowest number of rainy days is March (12.2 days).

Average sea temperature in May - San Juan, PR
  • Average sea temperature in May: 27.5°C

The best month for swimming (with the highest average sea temperature) is September (29.4°C).
Coldest months (with the lowest average sea temperature) are February and March (26.1°C).

Average daylight in May / Average sunshine in May - San Juan, PR
  • Average daylight in May: 13h

The month with the longest days is June (Average daylight: 13.2h).
The month with shortest days is December (Average daylight: 11h).

  • Average sunshine in May: 8.2h

Months with most sunshine are March and July (Average sunshine: 9.1h).
The month with least sunshine is November (Average sunshine: 6.7h).

Average UV index in May - San Juan, PR
  • Average UV index in May: 12

Months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
Months with the lowest UV index are January and December (UV index 8).

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