May Weather at San José Airport Guatemala

Daily high temperatures decrease by 3°F, from 92°F to 89°F, rarely falling below 85°F or exceeding 95°F.

Daily low temperatures are around 75°F, rarely falling below 72°F or exceeding 77°F. The highest daily average low temperature is 75°F on May 13.

For reference, on April 4, the hottest day of the year, temperatures at San José Airport typically range from 73°F to 92°F, while on January 14, the coldest day of the year, they range from 67°F to 89°F.

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.

Cuiabá, Brazil (3,133 miles away); Chawang, Thailand (10,749 miles); and Ngoro, Indonesia (10,824 miles) are the far-away foreign places with temperatures most similar to San José Airport (view comparison).

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The month of May at San José Airport experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 72% to 91%.

The clearest day of the month is May 1, with clear, mostly clear, or partly cloudy conditions 28% of the time.

For reference, on June 14, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 92%, while on January 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 80%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At San José Airport, the chance of a wet day over the course of May is very rapidly increasing, starting the month at 18% and ending it at 47%.

For reference, the year's highest daily chance of a wet day is 57% on September 11, and its lowest chance is 1% on January 25.

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 May at San José Airport is very rapidly increasing, starting the month at 2.2 inches, when it rarely exceeds 4.7 inches or falls below 0.1 inches, and ending the month at 6.6 inches, when it rarely exceeds 12.6 inches or falls below 1.0 inches.

Over the course of May at San José Airport, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 15 minutes, implying an average daily increase of 31 seconds, and weekly increase of 3 minutes, 35 seconds.

The shortest day of the month is May 1, with 12 hours, 38 minutes of daylight and the longest day is May 31, with 12 hours, 54 minutes of daylight.

The latest sunrise of the month at San José Airport is 5:41 AM on May 1 and the earliest sunrise is 7 minutes earlier at 5:34 AM on May 31.

The earliest sunset is 6:19 PM on May 1 and the latest sunset is 8 minutes later at 6:28 PM on May 31.

Daylight saving time is not observed at San José Airport during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:36 AM and sets 12 hours, 57 minutes later, at 6:33 PM, while on December 21, the shortest day of the year, it rises at 6:22 AM and sets 11 hours, 18 minutes later, at 5:40 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 May 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 at San José Airport is essentially constant during May, remaining around 99% throughout.

For reference, on June 13, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 15, the least muggy day of the year, there are muggy conditions 84% 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 at San José Airport is essentially constant during May, remaining within 0.1 miles per hour of 6.2 miles per hour throughout.

For reference, on January 13, the windiest day of the year, the daily average wind speed is 8.0 miles per hour, while on July 23, the calmest day of the year, the daily average wind speed is 5.6 miles per hour.

The hourly average wind direction at San José Airport throughout May is predominantly from the west, with a peak proportion of 40% on May 28.

San José Airport 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 at San José Airport is essentially constant during May, remaining around 86°F throughout.

The highest average surface water temperature during May is 86°F on May 15.

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 at San José Airport 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 at San José Airport are very rapidly increasing during May, increasing by 934°F, from 3,497°F to 4,432°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 at San José Airport is decreasing during May, falling by 1.1 kWh, from 5.6 kWh to 4.5 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of San José Airport are 13.936 deg latitude, -90.836 deg longitude, and 30 ft elevation.

The topography within 2 miles of San José Airport is essentially flat, with a maximum elevation change of 69 feet and an average elevation above sea level of 28 feet. Within 10 miles is essentially flat (240 feet). Within 50 miles contains only modest variations in elevation (13,054 feet).

The area within 2 miles of San José Airport is covered by trees (31%), cropland (30%), and grassland (26%), within 10 miles by water (44%) and trees (17%), and within 50 miles by water (51%) and trees (18%).