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The climate of San Juan (Puerto Rico)
San Juan is the largest and most important city in Puerto Rico. The capital of the island has a population of about 500,000. San Juan has the highest concentration of white inhabitants in the Caribbean. About three quarters of the population of San Juan is Caucasian. This is caused by the many immigrants that came from Spain in the past. San Juan has a tropical monsoon climate (type Am according to the Köppen climate classification) with warm weather and precipitation all year round. The only reason the climate of San Juan cannot be classified as a tropical rainforest climate is because the driest months get less than 60 millimeters of precipitation. In total San Juan gets 1,289 millimeters of annual precipitation quite evenly spread out over the year. From January till March precipitation figures are slightly lower.

During the winter daytime temperatures are 28 degrees Celsius (82.4 degrees Fahrenheit), during the summer daytime temperatures are 31 degrees Celsius (87.8 degrees Fahrenheit). Large deviations in temperatures are uncommon. The highest temperatures that may occur are 36-37 degrees Celsius (96.8-98.6 degrees Fahrenheit). Minimum temperatures are between 22-25 degrees Celsius (71.6-77.0 degrees Fahrenheit). These figures are also fairly constant, because temperatures lower than 16 degrees Celsius (60.8 degrees Fahrenheit) during the winter and lower than 21 degrees Celsius (69.8 degrees Fahrenheit) during the summer are uncommon. High temperatures in combination with high precipitation figures cause high humidity figures which may cause things to feel muggy. However, because of an ever blowing sea breeze this effect is slightly tempered.


Climate information
The figures below are based on long term weather and climate records. They are an average for San Juan.

temperature (°C)


temperature (°C)
hours of sunshine

average days with precipitation
per month
per month
temperature (°C)
January 28 22 8 16 26
February 28 22 8 12 26
March 28 22 9 13 26
April 29 23 9 14 27
May 30 24 8 17 27
June 31 25 9 16 28
July 31 25 9 18 28
August 31 25 9 20 29
September 31 24 8 19 29
October 30 23 7 18 29
November 29 22 7 20 28
December 28 22 7 18 27
= 0-5 mm ● = 6-30 mm ● = 31-60 mm ● = 61-100 mm ● = 101-200 mm ● = over 200 mm
= 0-0.2 inches ● = 0.2-1.2 inches ● = 1.2-2.4 inches ● = 2.5-4 inches ● = 4.1-8 inches ● = over 8 inches

More climate information
Climate figures are very useful but don’t present a general impression of the climate and the eventual weather circumstances within a certain period. The figures don’t always reflect the chance of wintry weather, extreme heat or hurricanes. That is why we offer useful extra climate information for each month of the year:

chance of
(very) hot


chance of
(very) cool
chance of

chance of
chance of
sunny days


click here for the explanation of the symbols

The information at this site was carefully composed from climate data collected by meteorological services, meteorological offices, climate experts and other sources. “More climate info” is based on statistics, climate data and personal experience. No rights can be derived from this site. Weather has no memory and gives no guaranties. Nothing is as changeable and unpredictable as the weather. The authors of this site feel in no way responsible for any damages caused by misinterpretation or other circumstances that may influence your holiday or trip to a certain destination. We provide information, it’s up to the reader to use it to it’s benefit.


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