May Weather in Puerto Rico

The tables below give the normal May temperatures and rainfall for cities and popular vacation spots in Puerto Rico. There's also information here on this month's average humidity and ocean temperature at San Juan.

The temperature and rain measurements are averages based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information.

One site, Pico Del Este, is much cooler than others on the list. That's because it's a high mountain peak, at 3448 feet (1050 metres) elevation, in the El Yunque Caribbean National Forest.

Temperature

Average May temperatures in Puerto Rico

High °F	Low °F	Place	High °C	Low °C
86	72	Aguirre	30	22
80	66	Aibonito	26	19
89	69	Caguas	32	21
87	75	Ceiba	30	24
86	72	Dorado	30	22
88	76	Guayama	31	24
85	71	Isabela	29	22
86	71	Juncos	30	21
88	75	La Parguera	31	24
90	69	Lajas	32	20
87	74	Levittown	30	23
85	70	Manati	30	21
78	65	Maricao	26	18
89	71	Mayagüez	31	22
90	71	Mona Island	32	22
69	62	Pico Del Este	21	17
90	67	Ponce	32	19
87	76	San Juan	31	24

Ocean Temperature at San Juan, Puerto Rico averages 81 degrees Fahrenheit (27 degrees Celsius) in May.

Rainfall

Average total precipitation in May. Days are when it rains at least 0.01 inches (0.25 millimetres).

Days	Place	Inches	Milli­metres
9	Aguirre	4.5	115
14	Aibonito	5.5	141
18	Caguas	5.4	137
15	Ceiba	6.7	170
14	Dorado	6.3	159
16	Guayama	5.3	134
15	Isabela	7.2	183
17	Juncos	6.4	162
–	La Parguera	4.1	103
10	Lajas	4.4	112
–	Levittown	7.0	177
14	Manati	6.2	158
–	Maricao	10.4	264
11	Mayagüez	6.0	152
12	Mona Island	4.9	125
10	Ponce	4.2	106
17	San Juan	5.5	141

Relative Humidity at San Juan, Puerto Rico in May averages 78 percent in the morning and 66 percent in the afternoon.