Average Weather in September in El Guantillo Honduras
Daily high temperatures decrease by 2°F, from 85°F to 83°F, rarely falling below 79°F or exceeding 89°F.
Daily low temperatures are around 66°F, rarely falling below 63°F or exceeding 68°F.
For reference, on April 13, the hottest day of the year, temperatures in El Guantillo typically range from 65°F to 89°F, while on January 21, the coldest day of the year, they range from 60°F to 80°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
Catalão, Brazil (3,512 miles away); Kilimatinde, Tanzania (8,483 miles); and Badulla, Sri Lanka (10,757 miles) are the far-away foreign places with temperatures most similar to El Guantillo (view comparison).
The month of September in El Guantillo experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 86% throughout the month. The highest chance of overcast or mostly cloudy conditions is 88% on September 19.
The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 17% of the time.
For reference, on June 6, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 92%, while on January 17, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 77%.
Cloud Cover Categories in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In El Guantillo, the chance of a wet day over the course of September is gradually increasing, starting the month at 45% and ending it at 48%.
For reference, the year's highest daily chance of a wet day is 50% on September 18, and its lowest chance is 5% on March 10.
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 El Guantillo is essentially constant, remaining about 4.1 inches throughout, and rarely exceeding 8.6 inches or falling below 0.8 inches.
The highest average 31-day accumulation is 4.3 inches on September 20.
Average Monthly Rainfall in September
Over the course of September in El Guantillo, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 23 minutes, implying an average daily decrease of 48 seconds, and weekly decrease of 5 minutes, 37 seconds.
The shortest day of the month is September 30, with 12 hours, 1 minute of daylight and the longest day is September 1, with 12 hours, 24 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in El Guantillo is 5:37 AM on September 1 and the latest sunrise is 1 minute, 38 seconds later at 5:38 AM on September 30.
The latest sunset is 6:00 PM on September 1 and the earliest sunset is 22 minutes earlier at 5:39 PM on September 30.
Daylight saving time is not observed in El Guantillo during 2018.
For reference, on June 21, the longest day of the year, the Sun rises at 5:21 AM and sets 12 hours, 60 minutes later, at 6:20 PM, while on December 21, the shortest day of the year, it rises at 6:09 AM and sets 11 hours, 16 minutes later, at 5:25 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 El Guantillo is increasing during September, rising from 78% to 87% over the course of the month.
The highest chance of a muggy day during September is 88% on September 20.
For reference, on September 20, the muggiest day of the year, there are muggy conditions 88% of the time, while on February 2, the least muggy day of the year, there are muggy conditions 4% of the time.
Humidity Comfort Levels in September
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 El Guantillo is essentially constant during September, remaining within 0.2 miles per hour of 4.9 miles per hour throughout.
For reference, on January 14, the windiest day of the year, the daily average wind speed is 7.2 miles per hour, while on September 19, the calmest day of the year, the daily average wind speed is 4.6 miles per hour.
The lowest daily average wind speed during September is 4.6 miles per hour on September 21.
Average Wind Speed in September
Wind Direction 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 El Guantillo 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
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 El Guantillo are rapidly increasing during September, increasing by 688°F, from 5,666°F to 6,354°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 El Guantillo is gradually decreasing during September, falling by 0.6 kWh, from 5.7 kWh to 5.1 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of El Guantillo are 14.600 deg latitude, -87.300 deg longitude, and 2,680 ft elevation.
The topography within 2 miles of El Guantillo contains large variations in elevation, with a maximum elevation change of 1,972 feet and an average elevation above sea level of 2,793 feet. Within 10 miles contains large variations in elevation (3,530 feet). Within 50 miles also contains extreme variations in elevation (7,664 feet).
The area within 2 miles of El Guantillo is covered by trees (49%), cropland (25%), and grassland (18%), within 10 miles by trees (42%) and grassland (41%), and within 50 miles by trees (53%) and grassland (21%).
This report illustrates the typical weather in El Guantillo 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 are 4 weather stations near enough to contribute to our estimation of the temperature and dew point in El Guantillo.
For each station, the records are corrected for the elevation difference between that station and El Guantillo according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at El Guantillo is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between El Guantillo and a given station.
The stations contributing to this reconstruction are: Soto Cano Air Base (51%, 42 kilometers, southwest); Toncontín International Airport (31%, 61 kilometers, south); Ramón Villeda Morales International Airport (10%, 116 kilometers, northwest); and La Ceiba Airport (8%, 136 kilometers, north).
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.
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.