Average Weather in May in Jacó Costa Rica
In Jacó, the month of May is characterized by gradually falling daily high temperatures, with daily highs decreasing by 2°F, from 90°F to 88°F over the course of the month, and rarely exceeding 93°F or dropping below 85°F.
Daily low temperatures are around 79°F, rarely falling below 76°F or exceeding 83°F.
For reference, on February 28, the hottest day of the year, temperatures in Jacó typically range from 81°F to 92°F, while on October 2, the coldest day of the year, they range from 77°F to 88°F.
Average High and Low Temperature in May
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on May. 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 May
The month of May in Jacó experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 84% to 94%.
The clearest day of the month is May 1, with clear, mostly clear, or partly cloudy conditions 16% of the time.
For reference, on June 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 94%, while on January 1, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 66%.
Cloud Cover Categories in May
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Jacó, the chance of a wet day over the course of May is very rapidly increasing, starting the month at 27% and ending it at 45%.
For reference, the year's highest daily chance of a wet day is 55% on October 7, and its lowest chance is 4% on February 7.
Probability of Precipitation in May
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 May in Jacó is very rapidly increasing, starting the month at 3.0 inches, when it rarely exceeds 5.9 inches or falls below 0.7 inches, and ending the month at 5.9 inches, when it rarely exceeds 10.1 inches or falls below 2.1 inches.
Average Monthly Rainfall in May
Over the course of May in Jacó, the length of the day is essentially constant. The shortest day of the month is May 1, with 12 hours, 28 minutes of daylight and the longest day is May 31, with 12 hours, 39 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Jacó is 5:21 AM on May 1 and the earliest sunrise is 5 minutes earlier at 5:16 AM on May 28.
The earliest sunset is 5:49 PM on May 1 and the latest sunset is 6 minutes later at 5:55 PM on May 31.
Daylight saving time is not observed in Jacó during 2017.
For reference, on June 21, the longest day of the year, the Sun rises at 5:19 AM and sets 12 hours, 41 minutes later, at 6:01 PM, while on December 21, the shortest day of the year, it rises at 5:49 AM and sets 11 hours, 34 minutes later, at 5:23 PM.
Sunrise & Sunset with Twilight in May
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 Jacó is gradually increasing during May, rising from 95% to 100% over the course of the month.
For reference, on September 29, the muggiest day of the year, there are muggy conditions 100% of the time, while on February 10, the least muggy day of the year, there are muggy conditions 59% of the time.
Humidity Comfort Levels in May
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 Jacó is increasing during May, increasing from 4.8 miles per hour to 5.8 miles per hour over the course of the month.
For reference, on October 8, the windiest day of the year, the daily average wind speed is 6.9 miles per hour, while on January 1, the calmest day of the year, the daily average wind speed is 3.6 miles per hour.
Average Wind Speed in May
Wind Direction in May
Jacó 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 Jacó is essentially constant during May, remaining around 84°F throughout.
Average Water Temperature in May
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 Jacó is decreasing during May, falling by 1.3 kWh, from 5.0 kWh to 3.7 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in May
For the purposes of this report, the geographical coordinates of Jacó are 9.615 deg latitude, -84.630 deg longitude, and 62 ft elevation.
The topography within 2 miles of Jacó contains very significant variations in elevation, with a maximum elevation change of 1,243 feet and an average elevation above sea level of 110 feet. Within 10 miles contains very significant variations in elevation (2,631 feet). Within 50 miles contains large variations in elevation (9,314 feet).
The area within 2 miles of Jacó is covered by water (32%), grassland (23%), trees (22%), and cropland (15%), within 10 miles by water (57%) and trees (18%), and within 50 miles by water (57%) and trees (20%).
This report illustrates the typical weather in Jacó 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 is only a single weather station, Juan Santamaría International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Jacó.
At a distance of 63 kilometers from Jacó, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.
The station records are corrected for the elevation difference between the station and Jacó according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.
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.