January Weather in Puerto Rico: Temperature, Rain Averages

The tables below give the normal January 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 January temperatures in Puerto Rico
High °F	Low °F	Place	High °C	Low °C
84	66	Aguirre	29	19
74	62	Aibonito	23	17
85	62	Caguas	29	17
83	71	Ceiba	28	22
79	67	Dorado	26	20
85	72	Guayama	30	22
81	67	Isabela	27	19
82	65	Juncos	28	18
86	70	La Parguera	30	21
87	62	Lajas	31	17
82	70	Levittown	28	21
81	66	Manati	27	19
76	62	Maricao	24	17
85	68	Mayagüez	29	20
85	69	Mona Island	29	20
66	59	Pico Del Este	19	15
88	63	Ponce	31	17
83	72	San Juan	28	22

Ocean Temperature at San Juan, Puerto Rico averages 77 degrees Fahrenheit (25 degrees Celsius) in January.

Rainfall

Average total precipitation in January. Days are when it rains at least 0.01 inches (0.25 millimetres).
Days	Place	Inches	Millimetres
7	Aguirre	1.3	32
16	Aibonito	3.8	95
20	Caguas	3.7	94
16	Ceiba	2.6	67
17	Dorado	5.6	142
15	Guayama	2.4	61
13	Isabela	3.7	95
16	Juncos	3.3	83
–	La Parguera	1.9	49
8	Lajas	2.2	56
–	Levittown	4.8	121
15	Manati	5.1	129
–	Maricao	3.7	93
5	Mayagüez	1.2	30
11	Mona Island	1.6	41
6	Ponce	0.7	19
18	San Juan	4.1	103

Relative Humidity at San Juan, Puerto Rico in January averages 82 percent in the morning and 65 percent in the afternoon.

January Weather in Puerto Rico

Temperature

Rainfall

References

More Caribbean Weather Information