Puerto Rico Rainfall & Precipitation: Monthly Averages and Year-Round Insights

This page shows the average amount of rainfall per month in Puerto Rico. The numbers are calculated over a 30-year period to provide a reliable average. Now, let’s explore all the details to give you a full picture.

Puerto Rico is known for its substantial rainfall, with annual precipitation reaching 1913 mm.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm)

Puerto Rico can be quite wet during October, receiving approximately 215 mm of precipitation over 10 rainy days.

In contrast August, experiences much drier conditions, with 94 mm of rainfall, spread across 9 rainy days.

Annual Precipitation in Argentina

The map below shows the annual precipitation across Argentina. You can also select the different months in case you are interested in a specific month.

Amsterdam Precipitation Compared World Wide

Puerto Rico’s average annual precipitation is 1913 mm. Let’s compare this to some popular worldwide tourist destinations:

In Barcelona, Spain, the average annual precipitation is 644 mm, evenly distributed across the year with no extreme wet or dry seasons.

In Shanghai, China, the annual average precipitation is 1347 mm, with a humid subtropical climate.

In Tokyo, Japan, the average annual precipitation is 1528 mm, with significant summer rains due to typhoon season.

Singapore, situated near the equator, gets 2581 mm of rainfall annually, with no distinct dry season and consistent monthly precipitation.

How is Precipitation Measured?

Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.

Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.

Interesting weather facts

• "Ginger" was the longest-lasting Atlantic tropical storm, which spun around the open ocean for 28 days in 1971.
• The world's largest snowflake was recorded in the Guinness Book of Records, at 38 cm wide and 20 cm thick. The snowflake fell at Fort Keogh, Montana, USA, on 28 January 1887.
• The greatest snowfall recorded was on Mt. Rainier, Washington State, USA—over 31.5 meters fell during the winter of 1972.

For more detailed information about Puerto Rico’s weather, including sunshine hours, humidity levels, and temperature data, visit our Puerto Rico Climate page.