April Weather in Puerto Rico Puerto Rico

Daily high temperatures are around 85°F, rarely falling below 81°F or exceeding 90°F.

Daily low temperatures are around 74°F, rarely falling below 71°F or exceeding 78°F.

For reference, on August 24, the hottest day of the year, temperatures in Puerto Rico typically range from 78°F to 88°F, while on January 24, the coldest day of the year, they range from 72°F to 82°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on April. 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.

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The month of April in Puerto Rico experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 25% to 46%.

The clearest day of the month is April 1, with clear, mostly clear, or partly cloudy conditions 75% of the time.

For reference, on May 28, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 74%, while on January 11, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 82%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Puerto Rico, the chance of a wet day over the course of April is very rapidly increasing, starting the month at 27% and ending it at 39%.

For reference, the year's highest daily chance of a wet day is 50% on September 25, and its lowest chance is 20% on January 17.

Rainfall

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 April in Puerto Rico is rapidly increasing, starting the month at 1.6 inches, when it rarely exceeds 3.5 inches or falls below 0.1 inches, and ending the month at 3.2 inches, when it rarely exceeds 6.6 inches or falls below 0.6 inches.

Over the course of April in Puerto Rico, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 28 minutes, implying an average daily increase of 58 seconds, and weekly increase of 6 minutes, 47 seconds.

The shortest day of the month is April 1, with 12 hours, 20 minutes of daylight and the longest day is April 30, with 12 hours, 48 minutes of daylight.

The latest sunrise of the month in Puerto Rico is 6:19 AM on April 1 and the earliest sunrise is 21 minutes earlier at 5:59 AM on April 30.

The earliest sunset is 6:39 PM on April 1 and the latest sunset is 8 minutes later at 6:47 PM on April 30.

Daylight saving time is not observed in Puerto Rico during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:50 AM and sets 13 hours, 14 minutes later, at 7:04 PM, while on December 21, the shortest day of the year, it rises at 6:53 AM and sets 11 hours, 2 minutes later, at 5:55 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for April 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

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 Puerto Rico is increasing during April, rising from 88% to 97% over the course of the month.

For reference, on June 11, the muggiest day of the year, there are muggy conditions 100% of the time, while on March 8, the least muggy day of the year, there are muggy conditions 81% of the time.

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 Puerto Rico is essentially constant during April, remaining within 0.2 miles per hour of 10.8 miles per hour throughout.

For reference, on July 13, the windiest day of the year, the daily average wind speed is 12.6 miles per hour, while on October 9, the calmest day of the year, the daily average wind speed is 9.4 miles per hour.

The hourly average wind direction in Puerto Rico throughout April is predominantly from the east, with a peak proportion of 85% on April 1.

Puerto Rico 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 Puerto Rico is essentially constant during April, remaining within 1°F of 80°F throughout.

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 Puerto Rico 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.

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 Puerto Rico are rapidly increasing during April, increasing by 844°F, from 2,457°F to 3,301°F, over the course of the month.

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 Puerto Rico is essentially constant during April, remaining within 0.2 kWh of 6.9 kWh throughout.

The highest average daily incident shortwave solar energy during April is 7.1 kWh on April 3.

For the purposes of this report, the geographical coordinates of Puerto Rico are 18.248 deg latitude, -66.500 deg longitude, and 0 ft elevation.

The topography within 2 miles of Puerto Rico is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet).

The area within 2 miles of Puerto Rico is covered by trees (92%), within 10 miles by trees (74%), and within 50 miles by water (65%) and trees (18%).