Average Weather in March in Arenal Peru
Daily high temperatures are around 87°F, rarely falling below 83°F or exceeding 90°F.
Daily low temperatures are around 74°F, rarely falling below 70°F or exceeding 78°F.
For reference, on February 24, the hottest day of the year, temperatures in Arenal typically range from 75°F to 87°F, while on August 27, the coldest day of the year, they range from 64°F to 74°F.
Average High and Low Temperature in March
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on March. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature in March
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
Kualapu‘u, Hawaii, United States (5,452 miles away); Les Avirons, Réunion (8,984 miles); and Wé, New Caledonia (7,490 miles) are the far-away foreign places with temperatures most similar to Arenal (view comparison).
The month of March in Arenal experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 69% to 63%.
The clearest day of the month is March 31, with clear, mostly clear, or partly cloudy conditions 37% of the time.
For reference, on February 14, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 71%, while on August 7, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 78%.
Cloud Cover Categories in March
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Arenal, the chance of a wet day over the course of March is gradually decreasing, starting the month at 14% and ending it at 10%.
For reference, the year's highest daily chance of a wet day is 15% on March 9, and its lowest chance is 0% on August 26.
Probability of Precipitation in March
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during March in Arenal is gradually decreasing, starting the month at 1.4 inches, when it rarely exceeds 3.2 inches, and ending the month at 0.9 inches, when it rarely exceeds 2.8 inches or falls below -0.0 inches.
The highest average 31-day accumulation is 1.4 inches on March 9.
Average Monthly Rainfall in March
Over the course of March in Arenal, the length of the day is essentially constant. The shortest day of the month is March 31, with 12 hours, 4 minutes of daylight and the longest day is March 1, with 12 hours, 12 minutes of daylight.
Hours of Daylight and Twilight in March
The latest sunrise of the month in Arenal is 6:30 AM on March 1 and the earliest sunrise is 4 minutes earlier at 6:26 AM on March 31.
The latest sunset is 6:42 PM on March 1 and the earliest sunset is 12 minutes earlier at 6:30 PM on March 31.
Daylight saving time is not observed in Arenal during 2019.
For reference, on December 22, the longest day of the year, the Sun rises at 6:10 AM and sets 12 hours, 25 minutes later, at 6:34 PM, while on June 21, the shortest day of the year, it rises at 6:30 AM and sets 11 hours, 50 minutes later, at 6:21 PM.
Sunrise & Sunset with Twilight in March
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The chance that a given day will be muggy in Arenal is decreasing during March, falling from 97% to 89% over the course of the month.
For reference, on February 24, the muggiest day of the year, there are muggy conditions 97% of the time, while on September 24, the least muggy day of the year, there are muggy conditions 6% of the time.
Humidity Comfort Levels in March
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Arenal is essentially constant during March, remaining within 0.2 miles per hour of 7.8 miles per hour throughout.
For reference, on October 1, the windiest day of the year, the daily average wind speed is 12.1 miles per hour, while on March 17, the calmest day of the year, the daily average wind speed is 7.6 miles per hour.
The lowest daily average wind speed during March is 7.6 miles per hour on March 17.
Average Wind Speed in March
Wind Direction in March
Arenal is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average surface water temperature in Arenal is gradually decreasing during March, falling by 2°F, from 74°F to 72°F, over the course of the month.
The highest average surface water temperature during March is 74°F on March 2.
Average Water Temperature in March
Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
Temperatures in Arenal are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.
Time Spent in Various Temperature Bands and the Growing Season in March
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
The average accumulated growing degree days in Arenal are rapidly increasing during March, increasing by 857°F, from 5,317°F to 6,174°F, over the course of the month.
Growing Degree Days in March
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy in Arenal is essentially constant during March, remaining around 6.3 kWh throughout.
The lowest average daily incident shortwave solar energy during March is 6.3 kWh on March 31.
Average Daily Incident Shortwave Solar Energy in March
For the purposes of this report, the geographical coordinates of Arenal are -4.883 deg latitude, -81.027 deg longitude, and 59 ft elevation.
The topography within 2 miles of Arenal contains only modest variations in elevation, with a maximum elevation change of 341 feet and an average elevation above sea level of 120 feet. Within 10 miles contains only modest variations in elevation (748 feet). Within 50 miles contains significant variations in elevation (4,787 feet).
The area within 2 miles of Arenal is covered by bare soil (32%), shrubs (20%), cropland (16%), and trees (14%), within 10 miles by bare soil (55%) and sparse vegetation (14%), and within 50 miles by water (42%) and bare soil (25%).
This report illustrates the typical weather in Arenal year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Arenal.
For each station, the records are corrected for the elevation difference between that station and Arenal according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Arenal is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Arenal and a given station.
The stations contributing to this reconstruction are: Cap. FAP Víctor Montes Arias Airport (61%, 42 kilometers, northwest) and Capitán FAP Guillermo Concha Iberico International Airport (39%, 58 kilometers, southeast).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.