Average Weather in September in La Libertad Mexico
Daily high temperatures decrease by 4°F, from 96°F to 91°F, rarely falling below 86°F or exceeding 101°F.
Daily low temperatures decrease by 6°F, from 83°F to 77°F, rarely falling below 72°F or exceeding 87°F.
For reference, on July 28, the hottest day of the year, temperatures in La Libertad typically range from 83°F to 97°F, while on January 6, the coldest day of the year, they range from 53°F to 69°F.
Average High and Low Temperature in September
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on September. 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 September
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
El Gouna, Egypt (7,905 miles away); Al Faşāyil, Palestinian Territories (7,683 miles); and Taichung, Taiwan (7,300 miles) are the far-away foreign places with temperatures most similar to La Libertad (view comparison).
The month of September in La Libertad experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 24% to 14%. The lowest chance of overcast or mostly cloudy conditions is 13% on September 26.
The clearest day of the month is September 26, with clear, mostly clear, or partly cloudy conditions 87% of the time.
For reference, on July 28, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 41%, while on June 10, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 88%.
Cloud Cover Categories in September
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 La Libertad, the chance of a wet day over the course of September is very rapidly decreasing, starting the month at 20% and ending it at 7%.
For reference, the year's highest daily chance of a wet day is 25% on August 24, and its lowest chance is 1% on May 22.
Probability of Precipitation in September
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 September in La Libertad is decreasing, starting the month at 1.2 inches, when it rarely exceeds 2.4 inches or falls below 0.3 inches, and ending the month at 0.6 inches, when it rarely exceeds 1.5 inches.
Average Monthly Rainfall in September
Over the course of September in La Libertad, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 51 minutes, implying an average daily decrease of 1 minute, 46 seconds, and weekly decrease of 12 minutes, 25 seconds.
The shortest day of the month is September 30, with 11 hours, 53 minutes of daylight and the longest day is September 1, with 12 hours, 44 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in La Libertad is 6:08 AM on September 1 and the latest sunrise is 16 minutes later at 6:23 AM on September 30.
The latest sunset is 6:52 PM on September 1 and the earliest sunset is 36 minutes earlier at 6:16 PM on September 30.
Daylight saving time is not observed in La Libertad during 2020.
For reference, on June 20, the longest day of the year, the Sun rises at 5:30 AM and sets 14 hours, 4 minutes later, at 7:34 PM, while on December 21, the shortest day of the year, it rises at 7:22 AM and sets 10 hours, 13 minutes later, at 5:35 PM.
Sunrise & Sunset with Twilight in September
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 La Libertad is very rapidly decreasing during September, falling from 86% to 47% over the course of the month.
For reference, on August 20, the muggiest day of the year, there are muggy conditions 90% of the time, while on March 19, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in September
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 La Libertad is essentially constant during September, remaining within 0.1 miles per hour of 7.4 miles per hour throughout.
For reference, on December 10, the windiest day of the year, the daily average wind speed is 9.5 miles per hour, while on September 20, the calmest day of the year, the daily average wind speed is 7.3 miles per hour.
The lowest daily average wind speed during September is 7.3 miles per hour on September 20.
Average Wind Speed in September
The wind direction in La Libertad during September is predominantly out of the south from September 1 to September 20 and the west from September 20 to September 30.
Wind Direction in September
La Libertad 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 La Libertad is gradually decreasing during September, falling by 3°F, from 86°F to 83°F, over the course of the month.
Average Water Temperature in September
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 La Libertad 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 September
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 La Libertad are very rapidly increasing during September, increasing by 990°F, from 5,821°F to 6,811°F, over the course of the month.
Growing Degree Days in September
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 La Libertad is essentially constant during September, remaining within 0.2 kWh of 6.1 kWh throughout.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of La Libertad are 29.913 deg latitude, -112.692 deg longitude, and 85 ft elevation.
The topography within 2 miles of La Libertad contains significant variations in elevation, with a maximum elevation change of 758 feet and an average elevation above sea level of 81 feet. Within 10 miles contains significant variations in elevation (1,355 feet). Within 50 miles contains very significant variations in elevation (3,566 feet).
The area within 2 miles of La Libertad is covered by shrubs (70%) and water (27%), within 10 miles by shrubs (52%) and water (48%), and within 50 miles by water (53%) and shrubs (47%).
This report illustrates the typical weather in La Libertad 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, General Ignacio Pesqueira García International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of La Libertad.
At a distance of 183 kilometers from La Libertad, further than our threshold of 150 kilometers, this station is deemed insufficiently nearby to be relied upon as our primary source for temperature and dew point records. Consequently, the station records are blended with interpolated values from NASA's MERRA-2 satellite-era reanalysis , and both are corrected for elevation differences according to the International Standard Atmosphere .
The weight assigned to the MERRA-2 value depends on the distance from La Libertad to the nearest station, increasing from 0% at 150 kilometers to 100% at 200 kilometers. In this case, the MERRA-2 weight is 40%, making the weight assigned to the weather station 60%.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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.