Nuevo Arenal Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Nuevo Arenal, Guanacaste, Costa Rica. This average is based on long-term data collected between 1990 and 2020. Now, let's explore all the details to give you a full picture.
Nuevo Arenal is known for its substantial rainfall, with annual precipitation reaching 2276 mm (90 in). While the overall climate is wet, there are notable seasonal patterns that create interesting contrasts, as demonstrated in our graph below.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
Nuevo Arenal can be quite wet during October, receiving approximately 318 mm (13 in) of precipitation over 22 rainy days.
In contrast March, experiences much drier conditions, with 37 mm (1.5 in) of rainfall, spread across 7 rainy days.
October, the wettest month, has a maximum daytime temperature of 29°C (84°F). During the driest month March you can expect a temperature of 30°C (86°F). For more detailed insights into the city's temperatures, visit our Nuevo Arenal Temperature page.
Daily Historical Precipitation
42-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in July
Explore Nuevo Arenal's Historical Precipitation: 1976-2026
Browse day-by-day precipitation records for Nuevo Arenal spanning 51 years. Select any month and year to see actual rainfall and snowfall recorded on each day.
Annual Rainfall in Costa Rica: City Comparison
The map below shows the annual precipitation across Costa Rica. You can also select the different months in case you are interested in a specific month.
heavy rainfall
high
moderate
low
almost none
Nuevo Arenal vs World: Rainfall Compared
Nuevo Arenal's average annual precipitation is 2276 mm (90 in). Let's compare this to some popular worldwide tourist destinations:
In Barcelona, Spain, the average annual precipitation is 644 mm (25 in), evenly distributed across the year with no extreme wet or dry seasons.
Meanwhile, Buenos Aires, Argentina, enjoys a humid subtropical climate with 1000 mm (39 in) of annual rainfall, mostly in the summer.
In Brisbane, Australia, the annual precipitation is 979 mm (39 in), making it wetter than Sydney.
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.
Climate change is affecting precipitation patterns worldwide, including Nuevo Arenal:
- Changing Rainfall Patterns: Global warming causes drastic changes in the patterns of rainfall. Some areas have been experiencing increased frequency and intensity of rainfall, while other areas experience longer dry spells or even droughts.
- Local Impacts: Many regions are experiencing heavier rainfall in the winter months and drier, hotter summers. This affects agriculture, water resources, and ecosystems.
- "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 Nuevo Arenal's weather, including sunshine hours, humidity levels, and temperature data, visit our Nuevo Arenal Climate page.
