December Weather in Puerto Rico





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.

References

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

National Oceanographic Data Center. NODC Coastal Water Temperature Guide (CWTG).

Puerto Rico
Temperature & Rainfall
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