Weather in Puerto Rico in August

August in Puerto Rico sees the greatest amount of rainfall during the year and signals the begining of an increased chance of severe tropical weather that lasts until September. Temperatures generally peak around August and travel during this off-season has become more popular in recent years.

Typical Weather in August

August temperatures in Puerto Rico range from an average low of 76.0 degrees to an average high of 89.0 degrees


Puerto Rico in August: Key Facts
Monthly Averages
High Low Rainfall
No. of Days
with Rain
89.0° F 76.0° F 5.3 N.A.

During the early morning hours of an average August day in Puerto Rico, you can expect the temperature will be in the vicinity of 81.0 degrees. In August, temperatures typically rise to around 86.9 degrees by early afternoon. By the early evening hours in August the temperature will generally fall to somewhere in the vicinity of 81.2 degrees. For the month of August as a whole, temperatures in Puerto Rico average around 82.0 degrees.


August Temperatures in Puerto Rico by Time of Day
Early Morning Late Morning Early Afternoon Late Afternoon Early Evening Overall
81.0° F 86.3° F 86.9° F 84.9° F 81.2° F 82.0° F



Rain is least likely to occur in Puerto Rico during August around 11:00 AM, and it is most likely to occur around 2:00 AM. To the extent thunderstorms occur in Puerto Rico during August, they are most likely to occur around 2:00 PM, as shown in the following table.


August Rainfall in Puerto Rico by Time of Day
  Percent Frequencies of Hourly Observations
Hour Rain
2:00 AM 7.6 % 1.1 %
5:00 AM 6.6 % 1.3 %
8:00 AM 6.2 % 0.7 %
11:00 AM 5.4 % 1.1 %
2:00 PM 5.9 % 3.6 %
5:00 PM 6.1 % 2 %
8:00 PM 6.6 % 1.3 %
11:00 PM 6.7 % 1.5 %
ALL 6.4 % 1.6 %


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