Mayaguez Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Mayaguez, Central Puerto Rico, Puerto Rico. These averages rely on historical data collected over 30 years, from 1990 to 2020. Let's explore the details to provide you with a complete overview.
Generally, Mayaguez has a moderate amount of precipitation, averaging 794 mm (31 in) of rainfall annually. However, it does experience a distinct dry season during certain months. Take a look at our detailed charts below to see the seasonal variation.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
The climate in Mayaguez shows significant variation throughout the year. Expect 126 mm (5 in) of precipitation during the wettest month September, distributed over 17 rainy days.
In contrast, January offers drier and sunnier days, with around 23 mm (0.9 in) of rainfall over 19 rainy days.
September, the wettest month, has a maximum daytime temperature of 31°C (88°F). During the driest month January you can expect a temperature of 29°C (84°F). For more detailed insights into the city's temperatures, visit our Mayaguez Temperature page.
Explore Mayaguez's Historical Precipitation: 1976-2026
Browse day-by-day precipitation records for Mayaguez spanning 51 years. Select any month and year to see actual rainfall and snowfall recorded on each day.
Annual Rainfall in Puerto Rico: City Comparison
The map below shows the annual precipitation across Puerto Rico. You can also select the different months in case you are interested in a specific month.
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Mayaguez vs World: Rainfall Compared
Mayaguez's average annual precipitation is 794 mm (31 in). Let's compare this to some popular worldwide tourist destinations:
Athens, Greece, receives an average annual precipitation of 400 mm (16 in), making it one of the drier Mediterranean climates with rainfall mostly in winter.
Meanwhile, Buenos Aires, Argentina, enjoys a humid subtropical climate with 1000 mm (39 in) of annual rainfall, mostly in the summer.
Melbourne, Australia, has 690 mm (27 in) of rainfall annually, spread fairly evenly throughout the year.
Ho Chi Minh City, Vietnam, receives 1955 mm (77 in) of annual rainfall, with a pronounced wet season from May to November, typical of its tropical monsoon climate.
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.
Tropical Rainforests: In tropical regions, rainfall is generally abundant year-round. Areas near the equator, like the Amazon rainforest, can receive up to 3000 mm (118 in) of rain annually.
Desert Regions: Deserts such as the Sahara and Arabian deserts typically see less than 250 mm (9.8 in) of rainfall annually. Rainfall tends to be infrequent, but when it does occur, it is often intense.
Temperate Zones: In temperate regions, precipitation tends to be more evenly distributed, though areas closer to the ocean may see more rain in the winter months, and areas further inland experience drier summers.
Polar Regions: Precipitation in polar regions, like Antarctica, is extremely low, often falling as snow. Average annual precipitation in Antarctica is less than 200 mm (7.9 in), with some areas receiving as little as 50 mm (2 in) annually.
- The U.S. has a significant number of thunderstorms every year, with over 14.6 million taking place across the world annually.
- Approximately 70% of lightning bolts strike land rather than oceans.
- A storm named John was the longest-lasting Pacific tropical storm, continuing for 31 days. As it crossed the dateline twice, it changed status from a hurricane to a typhoon and back to a hurricane.
For more detailed information about Mayaguez's weather, including sunshine hours, humidity levels, and temperature data, visit our Mayaguez Climate page.
