May Weather in San Luis Argentina

Daily high temperatures decrease by 6°F, from 69°F to 63°F, rarely falling below 53°F or exceeding 78°F.

Daily low temperatures decrease by 6°F, from 50°F to 44°F, rarely falling below 36°F or exceeding 59°F.

For reference, on January 7, the hottest day of the year, temperatures in San Luis typically range from 66°F to 87°F, while on July 17, the coldest day of the year, they range from 40°F to 61°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.

Port Pirie, Australia (7,586 miles away) and Maitland, Australia (7,260 miles) are the far-away foreign places with temperatures most similar to San Luis (view comparison).

© OpenStreetMap contributors

Compare San Luis to another city:

CompareMap

The month of May in San Luis experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 34% to 44%. The highest chance of overcast or mostly cloudy conditions is 44% on May 30.

The clearest day of the month is May 1, with clear, mostly clear, or partly cloudy conditions 66% of the time.

For reference, on May 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 44%, while on March 1, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 81%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In San Luis, the chance of a wet day over the course of May is decreasing, starting the month at 10% and ending it at 6%.

For reference, the year's highest daily chance of a wet day is 38% on December 28, and its lowest chance is 3% on June 22.

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 in San Luis is decreasing, starting the month at 0.9 inches, when it rarely exceeds 2.2 inches or falls below 0.1 inches, and ending the month at 0.4 inches, when it rarely exceeds 1.1 inches or falls below -0.0 inches.

Over the course of May in San Luis, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 40 minutes, implying an average daily decrease of 1 minute, 19 seconds, and weekly decrease of 9 minutes, 14 seconds.

The shortest day of the month is May 31, with 10 hours, 6 minutes of daylight and the longest day is May 1, with 10 hours, 45 minutes of daylight.

The earliest sunrise of the month in San Luis is 7:59 AM on May 1 and the latest sunrise is 21 minutes later at 8:20 AM on May 31.

The latest sunset is 6:44 PM on May 1 and the earliest sunset is 19 minutes earlier at 6:25 PM on May 31.

Daylight saving time is not observed in San Luis during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 6:12 AM and sets 14 hours, 22 minutes later, at 8:34 PM, while on June 20, the shortest day of the year, it rises at 8:28 AM and sets 9 hours, 57 minutes later, at 6:25 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 in San Luis is essentially constant during May, remaining around 0% throughout.

For reference, on February 14, the muggiest day of the year, there are muggy conditions 9% of the time, while on June 19, the least muggy day of the year, there are muggy conditions 0% 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 San Luis is essentially constant during May, remaining within 0.2 miles per hour of 9.2 miles per hour throughout.

For reference, on September 30, the windiest day of the year, the daily average wind speed is 11.7 miles per hour, while on May 7, the calmest day of the year, the daily average wind speed is 9.0 miles per hour.

The lowest daily average wind speed during May is 9.0 miles per hour on May 7.

The hourly average wind direction in San Luis throughout May is predominantly from the north, with a peak proportion of 55% on May 13.

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).

The growing season in San Luis typically lasts for 10 months (311 days), from around August 3 to around June 10, rarely starting after September 7, or ending before May 11.

The month of May in San Luis is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly decreasing from 94% to 68% over the course of the month.

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 San Luis are increasing during May, increasing by 216°F, from 4,939°F to 5,155°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 San Luis is gradually decreasing during May, falling by 0.9 kWh, from 4.0 kWh to 3.1 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of San Luis are -33.295 deg latitude, -66.336 deg longitude, and 2,392 ft elevation.

The topography within 2 miles of San Luis contains only modest variations in elevation, with a maximum elevation change of 276 feet and an average elevation above sea level of 2,387 feet. Within 10 miles contains only modest variations in elevation (4,052 feet). Within 50 miles also contains extreme variations in elevation (6,037 feet).

The area within 2 miles of San Luis is covered by bare soil (26%), grassland (26%), trees (19%), and shrubs (16%), within 10 miles by shrubs (59%) and trees (28%), and within 50 miles by shrubs (66%) and trees (15%).