Loiza Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Loiza, Puerto Rico. The figures are based on a 30-year period (1990–2020) to provide a reliable average. Let's now guide you through the details for a complete overview.
Loiza has a notably wet climate with abundant precipitation, recording 1221 mm (48 in) of rainfall per year.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
Significant seasonal changes in precipitation occur throughout the year. During the wettest month, September receives substantial rainfall, averaging 156 mm (6.1 in) of precipitation, recorded across 18 rainy days.
In contrast, the driest month, February brings less rainfall, with 52 mm (2 in) over 15 rainy days.
September, the wettest month, has a maximum daytime temperature of 31°C (88°F). The city receives 236 hours of sunshine in this period. During the driest month February you can expect a temperature of 28°C (82°F). For more detailed insights into the city's temperatures, visit our Loiza Temperature page.
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in June
Explore Loiza's Historical Precipitation: 1976-2026
Browse day-by-day precipitation records for Loiza 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.
heavy rainfall
high
moderate
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Loiza vs World: Rainfall Compared
Loiza's average annual precipitation is 1221 mm (48 in). Let's compare this to some popular worldwide tourist destinations:
The climate in San Francisco, USA, is influenced by coastal weather, with 469 mm (18 in) of rainfall mostly during the winter months.
In Shanghai, China, the annual average precipitation is 1347 mm (53 in), with a humid subtropical climate.
Perth, Australia, receives 565 mm (22 in) of rainfall annually, mostly during the winter months.
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.
- "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 (15 inches) wide and 20 cm (7.9 inches) 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 (103 feet) fell during the winter of 1972.
For more detailed information about Loiza's weather, including sunshine hours, humidity levels, and temperature data, visit our Loiza Climate page.
