August weather forecast and climate
San Juan, PR

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

What are the warmest months in San Juan?

August and September, with an average high-temperature of 89.2°F (31.8°C), are warmest months in San Juan, Puerto Rico.

What is the temperature in August in San Juan?

In San Juan, in August, the average high-temperature is 89.2°F (31.8°C), and the average low-temperature is 78.3°F (25.7°C).

How much does it rain in San Juan in August?

In San Juan, in August, during 18.5 rainfall days, typically, 7.7" (195mm) of precipitation is accumulated.

What is the wettest month in San Juan?

August is the month with the most rainfall in San Juan, Puerto Rico. Rain falls for 18.5 days and accumulates 7.7" (195mm) of precipitation.

How warm is the water in August in San Juan?

In August, in San Juan, Puerto Rico, the average sea temperature is 84.6°F (29.2°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.
Average temperature in August - San Juan, PR
  • Average high temperature in August: 31.8°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 August: 25.7°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 August - San Juan, PR
  • Average humidity in August: 76.4%

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

Average rainfall in August - San Juan, PR
  • Average rainfall in August: 195mm

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

Average rainfall days in August - San Juan, PR
  • Average rainfall days in August: 18.5 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 August - San Juan, PR
  • Average sea temperature in August: 29.2°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 August / Average sunshine in August - San Juan, PR
  • Average daylight in August: 12.7h

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 August: 8.6h

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 August - San Juan, PR
  • Average UV index in August: 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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