The official rainy season in Puerto Rico kicks off in May and marks a dramatic increase in precipitation. Rainfall will generally be highest along the northern coast and the higher altitudes of the mountains. Although there is a definite increase in rainfall, warm weather and balmy breezes draw travelers and make May a popular month to visit.
Typical Weather in May
During May the temperatures in Puerto Rico typically vary between a daily high of about 87.0 degrees and a daily low of approximately 74.0 degrees
| Monthly Averages | | High | Low | Rainfall
(inches) | No. of Days
with Rain |
| 87.0° F |
74.0° F |
6.1 |
N.A. |
|
On any given day during May in Puerto Rico, you can expect early morning temperatures to be around 79.5 degrees.
Temperatures in Puerto Rico typically rise during the day, to an average of 84.9 degrees in the early afternoon.
By the early evening hours in May the temperature will generally fall to somewhere in the vicinity of 79.2 degrees.
Temperatures in Puerto Rico average around 80.0 degrees during May.
| Early Morning | Late Morning | Early Afternoon | Late Afternoon | Early Evening | Overall |
| 79.5° F |
84.4° F |
84.9° F |
82.9° F |
79.2° F |
80.0° F |
|
Rain
Rain is most likely to occur around 2:00 PM
during the month of May, and it is least likely to occur around 8:00 AM.
As shown below, if a thunderstorm occurs in May, it is most likely to occur around 2:00 PM.
| Percent Frequencies of Hourly Observations | | Hour | Rain
and/or
Drizzle | Thunder-
storms |
| 2:00 AM |
7.3 % |
0.6 % |
| 5:00 AM |
6.5 % |
0.6 % |
| 8:00 AM |
5.8 % |
0.3 % |
| 11:00 AM |
8 % |
0.5 % |
| 2:00 PM |
10.8 % |
2.1 % |
| 5:00 PM |
9.9 % |
1.4 % |
| 8:00 PM |
7.6 % |
1 % |
| 11:00 PM |
5.9 % |
0.2 % |
| ALL |
7.7 % |
0.8 % |
|
