Average Weather in September in Santiago Textitlán Mexico
Daily high temperatures are around 73°F, rarely falling below 68°F or exceeding 78°F. The lowest daily average high temperature is 73°F on September 14.
Daily low temperatures are around 54°F, rarely falling below 49°F or exceeding 58°F.
For reference, on April 15, the hottest day of the year, temperatures in Santiago Textitlán typically range from 53°F to 80°F, while on January 5, the coldest day of the year, they range from 44°F to 75°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
The month of September in Santiago Textitlán experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 92% throughout the month. The highest chance of overcast or mostly cloudy conditions is 94% on September 15.
The clearest day of the month is September 30, with clear, mostly clear, or partly cloudy conditions 10% of the time.
For reference, on June 24, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 94%, while on February 24, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 71%.
Cloud Cover Categories in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Santiago Textitlán, the chance of a wet day over the course of September is very rapidly decreasing, starting the month at 66% and ending it at 53%.
For reference, the year's highest daily chance of a wet day is 68% on September 12, and its lowest chance is 1% on December 8.
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 Santiago Textitlán is rapidly decreasing, starting the month at 6.9 inches, when it rarely exceeds 11.9 inches or falls below 2.8 inches, and ending the month at 5.7 inches, when it rarely exceeds 10.9 inches or falls below 1.9 inches.
The highest average 31-day accumulation is 7.0 inches on September 9.
Average Monthly Rainfall in September
Over the course of September in Santiago Textitlán, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 27 minutes, implying an average daily decrease of 55 seconds, and weekly decrease of 6 minutes, 28 seconds.
The shortest day of the month is September 30, with 11 hours, 60 minutes of daylight and the longest day is September 1, with 12 hours, 26 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Santiago Textitlán is 7:15 AM on September 1 and the latest sunrise is 3 minutes later at 7:19 AM on September 30.
The latest sunset is 7:42 PM on September 1 and the earliest sunset is 23 minutes earlier at 7:18 PM on September 30.
Daylight saving time is observed in Santiago Textitlán during 2018, but it neither starts nor ends during September, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 6:57 AM and sets 13 hours, 8 minutes later, at 8:04 PM, while on December 21, the shortest day of the year, it rises at 6:53 AM and sets 11 hours, 8 minutes later, at 6:01 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time 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 Santiago Textitlán is essentially constant during September, remaining around 2% throughout.
For reference, on June 8, the muggiest day of the year, there are muggy conditions 3% of the time, while on December 19, the least muggy day of the year, there are muggy conditions 0% 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 Santiago Textitlán is essentially constant during September, remaining within 0.2 miles per hour of 4.3 miles per hour throughout.
For reference, on January 13, the windiest day of the year, the daily average wind speed is 6.2 miles per hour, while on September 11, the calmest day of the year, the daily average wind speed is 4.2 miles per hour.
The lowest daily average wind speed during September is 4.2 miles per hour on September 11.
Average Wind Speed in September
Wind Direction in September
Santiago Textitlán 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 Santiago Textitlán is essentially constant during September, remaining around 85°F throughout.
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 Santiago Textitlán 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 Santiago Textitlán are increasing during September, increasing by 378°F, from 3,452°F to 3,830°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 Santiago Textitlán is essentially constant during September, remaining within 0.1 kWh of 4.9 kWh throughout.
The lowest average daily incident shortwave solar energy during September is 4.9 kWh on September 14.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of Santiago Textitlán are 16.693 deg latitude, -97.259 deg longitude, and 6,552 ft elevation.
The topography within 2 miles of Santiago Textitlán contains extreme variations in elevation, with a maximum elevation change of 3,760 feet and an average elevation above sea level of 6,225 feet. Within 10 miles also contains extreme variations in elevation (6,969 feet). Within 50 miles also contains extreme variations in elevation (10,981 feet).
The area within 2 miles of Santiago Textitlán is covered by trees (99%), within 10 miles by trees (94%), and within 50 miles by trees (46%) and shrubs (30%).
This report illustrates the typical weather in Santiago Textitlán 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, Oaxaca - Xoxocotlán International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Santiago Textitlán.
At a distance of 66 kilometers from Santiago Textitlán, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.
The station records are corrected for the elevation difference between the station and Santiago Textitlán according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.
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.