December Weather in Puerto Rico: Temperature, Rain Averages

The tables below give the normal December 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 December temperatures in Puerto Rico
High °F	Low °F	Place	High °C	Low °C
85	68	Aguirre	30	20
75	64	Aibonito	24	18
85	64	Caguas	30	18
84	73	Ceiba	29	23
82	69	Dorado	28	20
87	73	Guayama	30	23
82	69	Isabela	28	20
83	66	Juncos	28	19
88	70	La Parguera	31	21
88	64	Lajas	31	18
83	71	Levittown	29	21
82	67	Manati	28	20
75	64	Maricao	24	18
86	69	Mayagüez	30	21
86	69	Mona Island	30	21
67	60	Pico Del Este	19	16
88	64	Ponce	31	18
84	73	San Juan	29	23

Ocean Temperature at San Juan, Puerto Rico averages 80 degrees Fahrenheit (27 degrees Celsius) in December.

Rainfall

Average total precipitation in December. Days are when it rains at least 0.01 inches (0.25 millimetres).
Days	Place	Inches	Millimetres
7	Aguirre	1.7	42
17	Aibonito	4.1	105
21	Caguas	4.3	109
18	Ceiba	4.0	101
18	Dorado	5.3	133
15	Guayama	2.8	71
15	Isabela	4.4	112
18	Juncos	4.2	106
–	La Parguera	2.0	50
8	Lajas	2.0	51
–	Levittown	6.0	153
16	Manati	5.4	137
–	Maricao	3.9	99
6	Mayagüez	2.3	59
11	Mona Island	4.0	101
7	Ponce	1.5	37
20	San Juan	4.9	123

Relative Humidity at San Juan, Puerto Rico in December averages 82 percent in the morning and 66 percent in the afternoon.

December Weather in Puerto Rico

Temperature

Rainfall

References

More Caribbean Weather Information