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 »
  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. In San Juan in January, during 11.5 rainfall days, 0.83" (21mm) of precipitation is typically accumulated.
• Fajardo - January »
  On the first day of January in Fajardo sunrise is at 6:54 am and sunset at 5:57 pm. The months with the highest UV index in Fajardo are January, March through December, with an average maximum UV index of 7.
• Toa Baja - January »
  January in Toa Baja exhibits a rather steady climate, with the warm temperatures providing a delightful tropical atmosphere. Toa Baja's coldest month, January, registers temperatures that range from a high of 79.9°F (26.6°C) to a low of 73.6°F (23.1°C).
• Aguadilla - January »
  On the first day of January in Aguadilla sunrise is at 7:00 am and sunset at 6:03 pm. In Aguadilla, during January, the rain falls for 14.8 days and regularly aggregates up to 0.98" (25mm) of precipitation.
• Vega Baja - January »
  January temperatures in Vega Baja vary between a high-temperature of 80.4°F (26.9°C) and a low-temperature of 72.9°F (22.7°C). On the last day of January, in Vega Baja, sunrise is at 6:59 am and sunset at 6:18 pm AST.
• Juana Díaz - January »
  Temperature readings in Juana Díaz reach their annual highs in January, averaging 81°F (27.2°C) and a minimum average of 71.2°F (21.8°C). In Juana Díaz during January, the rain falls for 16.2 days and regularly aggregates up to 0.91" (23mm) of precipitation.
• Adjuntas - January »
  In Adjuntas in January, during 15.6 rainfall days, 0.71" (18mm) of precipitation is typically accumulated. In Adjuntas snow does not fall in January through August, October through December.
• 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. January is the coldest month in Cabo Rojo exhibiting average temperatures of 81.3°F (27.4°C) at the peak and 73.8°F (23.2°C) at the base.
• 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. January is the month when Guánica sees the lowest average temperatures, with a high of 81.9°F (27.7°C) and a low of 72°F (22.2°C).
• Vega Alta - January »
  The lowest temperatures in Vega Alta are recorded in January, with averages reaching a high of 79.9°F (26.6°C) and a low of 73.6°F (23.1°C). January in Vega Alta sees moderate temperatures and relatively high humidity.
• Luquillo - January »
  In Luquillo during January, the rain falls for 15.5 days and regularly aggregates up to 1.14" (29mm) of precipitation. Despite the increased daylight hours by 0.4 hours to 11.2 hours from December, Luquillo's January sees a considerable cloud cover of 37%.
• Rincon - January »
  The month with the least rainfall in Rincon is January, when the rain falls for 14.8 days and typically collects 0.98" (25mm) of precipitation. The month with the least rainfall in Rincon is January, when the rain falls for 14.8 days and typically collects 0.98" (25mm) of precipitation.