January weather forecast
Puerto Rico, USA

January in Puerto Rico marks the heart of the dry season. During this month, the temperature typically varies between a comfortable 72°F (22.2°C) as the low and rises to a warmer 85°F (29.4°C) during the day. When compared to the sweltering highs of August, January sees a noticeable decrease of about 6°F (-14.4°C).

The northern and central regions, such as San Juan and areas within the Cordillera Central Mountain Range, tend to be a few degrees cooler than the southern parts of the island. Interestingly, while January doesn't record the year's absolute lowest temperatures, Aibonito, located in the mountains, once noted a record low of 38°F (3.3°C), emphasizing the cooler conditions in higher altitudes.

Contrasted against December or February, January's weather remains relatively stable, with a subtle drop in humidity and temperatures. Coastal areas, such as Ponce and Mayagüez, remain slightly warmer than the mountainous regions, but the entire island benefits from the dry season's moderate conditions.

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• San Juan - January »
  In San Juan the coldest months are January and March, registering an average high-temperature of 79.9°F (26.6°C). January through March and December, with an average maximum UV index of 6, are months with the lowest UV index in San Juan, Puerto Rico.
• Fajardo - January »
  In Fajardo in January, during 15.5 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. January, March through December, with an average maximum UV index of 7, are months with the highest UV index in Fajardo, Puerto Rico.
• Toa Baja - January »
  January in Toa Baja, Puerto Rico, exhibits a rather steady climate, with the warm temperatures providing a delightful tropical atmosphere. In January, in Toa Baja the rain falls for 14.2 days.
• Aguadilla - January »
  The months with the highest UV index in Aguadilla are January through December, with an average maximum UV index of 7. In Aguadilla in January, during 14.8 rainfall days, 0.98" (25mm) of precipitation is typically accumulated.
• Vega Baja - January »
  In Vega Baja in January, it is raining for 13.3 days, with typically 1.06" (27mm) of accumulated precipitation. In Vega Baja in January, it is raining for 13.3 days, with typically 1.06" (27mm) of accumulated precipitation.
• Juana Díaz - January »
  The months with the lowest UV index in Juana Díaz are January through April, November and December, with an average maximum UV index of 6. On the first day of January in Juana Díaz, Puerto Rico, sunrise is at 6:57 am and sunset at 6:01 pm.
• Adjuntas - January »
  In Adjuntas, Puerto Rico, in January, during 15.6 rainfall days, 0.71" (18mm) of precipitation is typically accumulated. January through March, November and December, with an average maximum UV index of 6, are months with the lowest UV index in Adjuntas, Puerto Rico.
• Cabo Rojo - January »
  The month with the least rainfall in Cabo Rojo is January, when the rain falls for 13.5 days and typically collects 0.67" (17mm) of precipitation. Cabo Rojo experiences its lowest temperatures in January, with an average peak of 81.3°F (27.4°C) and a low of 73.8°F (23.2°C).
• Guánica - January »
  The month with the least rainfall in Guánica is January, when the rain falls for 15.6 days and typically collects 0.71" (18mm) of precipitation. In January, in Guánica, Puerto Rico, the rain falls for 15.6 days.
• Vega Alta - January »
  January, with average temperatures reaching a high of 79.9°F (26.6°C) and a low of 73.6°F (23.1°C), is the coldest month in Vega Alta, Puerto Rico. On the first day of January in Vega Alta, Puerto Rico, sunrise is at 6:57 am and sunset at 6:00 pm.
• Luquillo - January »
  January sees Luquillo, Puerto Rico experiencing consistent weather patterns typical of the region. January's advent in Luquillo presents an average high-temperature of a still moderately hot 79.3°F (26.3°C), indicating a slight variation from the conditions of the previous month.
• Rincon - January »
  The months with the highest UV index in Rincon are January through December, with an average maximum UV index of 7. On the first day of January in Rincon, Puerto Rico, sunrise is at 7:00 am and sunset at 6:04 pm.