September Weather in Valle de Allende Mexico
Daily high temperatures decrease by 2°F, from 83°F to 81°F, rarely falling below 74°F or exceeding 89°F.
Daily low temperatures decrease by 4°F, from 61°F to 57°F, rarely falling below 51°F or exceeding 64°F.
For reference, on June 5, the hottest day of the year, temperatures in Valle de Allende typically range from 62°F to 92°F, while on January 7, the coldest day of the year, they range from 37°F to 66°F.
Average High and Low Temperature in September in Valle de Allende
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 in Valle de Allende
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
The month of September in Valle de Allende experiences rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 54% to 40%.
The clearest day of the month is September 30, with clear, mostly clear, or partly cloudy conditions 60% of the time.
For reference, on August 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 56%, while on June 3, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 78%.
Cloud Cover Categories in September in Valle de Allende
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 Valle de Allende, the chance of a wet day over the course of September is very rapidly decreasing, starting the month at 38% and ending it at 20%.
For reference, the year's highest daily chance of a wet day is 44% on August 2, and its lowest chance is 2% on April 4.
Probability of Precipitation in September in Valle de Allende
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 Valle de Allende is rapidly decreasing, starting the month at 3.0 inches, when it rarely exceeds 6.4 inches or falls below 0.7 inches, and ending the month at 1.6 inches, when it rarely exceeds 3.7 inches or falls below 0.2 inches.
Average Monthly Rainfall in September in Valle de Allende
Over the course of September in Valle de Allende, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 45 minutes, implying an average daily decrease of 1 minute, 34 seconds, and weekly decrease of 10 minutes, 57 seconds.
The shortest day of the month is September 30, with 11 hours, 55 minutes of daylight and the longest day is September 1, with 12 hours, 40 minutes of daylight.
Hours of Daylight and Twilight in September in Valle de Allende
The earliest sunrise of the month in Valle de Allende is 6:41 AM on September 1 and the latest sunrise is 13 minutes later at 6:53 AM on September 30.
The latest sunset is 7:21 PM on September 1 and the earliest sunset is 33 minutes earlier at 6:48 PM on September 30.
Daylight saving time is observed in Valle de Allende during 2021, 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 6:08 AM and sets 13 hours, 50 minutes later, at 7:58 PM, while on December 21, the shortest day of the year, it rises at 6:46 AM and sets 10 hours, 27 minutes later, at 5:13 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in September in Valle de Allende
The figure below presents a compact representation of key lunar data for September 2021. 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.
Moon Rise, Set & Phases in September in Valle de Allende
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 Valle de Allende is essentially constant during September, remaining around 0% throughout.
For reference, on August 1, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in September in Valle de Allende
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 Valle de Allende is essentially constant during September, remaining within 0.1 miles per hour of 7.1 miles per hour throughout.
For reference, on March 26, the windiest day of the year, the daily average wind speed is 9.5 miles per hour, while on October 17, the calmest day of the year, the daily average wind speed is 6.9 miles per hour.
The highest daily average wind speed during September is 7.2 miles per hour on September 8.
Average Wind Speed in September in Valle de Allende
The hourly average wind direction in Valle de Allende throughout September is predominantly from the east, with a peak proportion of 63% on September 1.
Wind Direction in September in Valle de Allende
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 Valle de Allende typically lasts for 9.3 months (279 days), from around February 27 to around December 3, rarely starting before January 26 or after March 28, and rarely ending before November 12 or after December 25.
The month of September in Valle de Allende is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in September in Valle de Allende
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 Valle de Allende are rapidly increasing during September, increasing by 569°F, from 4,122°F to 4,691°F, over the course of the month.
Growing Degree Days in September in Valle de Allende
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 Valle de Allende is essentially constant during September, remaining within 0.2 kWh of 6.0 kWh throughout.
Average Daily Incident Shortwave Solar Energy in September in Valle de Allende
For the purposes of this report, the geographical coordinates of Valle de Allende are 26.935 deg latitude, -105.393 deg longitude, and 5,262 ft elevation.
The topography within 2 miles of Valle de Allende contains only modest variations in elevation, with a maximum elevation change of 302 feet and an average elevation above sea level of 5,319 feet. Within 10 miles contains only modest variations in elevation (1,148 feet). Within 50 miles contains very significant variations in elevation (5,922 feet).
The area within 2 miles of Valle de Allende is covered by grassland (54%) and shrubs (46%), within 10 miles by grassland (67%) and shrubs (32%), and within 50 miles by shrubs (52%) and grassland (39%).
This report illustrates the typical weather in Valle de Allende, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Valle de Allende is further than 200 kilometers from the nearest reliable weather station, so the weather-related data on this page were taken entirely from NASA's MERRA-2 satellite-era reanalysis . 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.
The temperature and dew point estimates are corrected for the difference between the reference elevation of the MERRA-2 grid cell and the elevation of Valle de Allende, according to the International Standard Atmosphere .
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.
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 airports 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.