Average Weather in September in Comas Peru
Daily high temperatures are around 59°F, rarely falling below 55°F or exceeding 63°F.
Daily low temperatures are around 38°F, rarely falling below 35°F or exceeding 41°F.
For reference, on October 29, the hottest day of the year, temperatures in Comas typically range from 40°F to 59°F, while on July 16, the coldest day of the year, they range from 36°F to 57°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
Westhaven-Moonstone, California, United States (4,804 miles away); Papatowai, New Zealand (6,789 miles); and Waiouru, New Zealand (6,702 miles) are the far-away foreign places with temperatures most similar to Comas (view comparison).
The month of September in Comas experiences rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 64% to 77%.
The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 36% of the time.
For reference, on February 23, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 92%, while on July 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 48%.
Cloud Cover Categories in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Comas, the chance of a wet day over the course of September is gradually increasing, starting the month at 2% and ending it at 5%.
For reference, the year's highest daily chance of a wet day is 26% on February 18, and its lowest chance is 1% on July 25.
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 Comas is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.9 inches or falling below -0.0 inches.
Average Monthly Rainfall in September
Over the course of September in Comas, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 18 minutes, implying an average daily increase of 38 seconds, and weekly increase of 4 minutes, 27 seconds.
The shortest day of the month is September 1, with 11 hours, 53 minutes of daylight and the longest day is September 30, with 12 hours, 12 minutes of daylight.
Hours of Daylight and Twilight in September
The latest sunrise of the month in Comas is 6:03 AM on September 1 and the earliest sunrise is 19 minutes earlier at 5:44 AM on September 30.
The latest sunset is 5:56 PM on September 1 and the earliest sunset is 48 seconds earlier at 5:56 PM on September 29.
Daylight saving time is not observed in Comas during 2018.
For reference, on December 21, the longest day of the year, the Sun rises at 5:33 AM and sets 12 hours, 49 minutes later, at 6:22 PM, while on June 21, the shortest day of the year, it rises at 6:19 AM and sets 11 hours, 26 minutes later, at 5:45 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 Comas is essentially constant during September, remaining around 0% throughout.
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 Comas is essentially constant during September, remaining within 0.1 miles per hour of 6.8 miles per hour throughout.
For reference, on September 26, the windiest day of the year, the daily average wind speed is 6.9 miles per hour, while on June 5, the calmest day of the year, the daily average wind speed is 5.6 miles per hour.
The highest daily average wind speed during September is 6.9 miles per hour on September 26.
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).
The growing season in Comas typically lasts for 10 months (317 days), from around August 6 to around June 20, rarely starting after September 12, or ending before May 23.
The month of September in Comas is more likely than not fully outside of the growing season, with the chance that a given day is in the growing season gradually increasing from 84% to 93% over the course of the month.
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 Comas are gradually increasing during September, increasing by 56°F, from 92°F to 148°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 Comas is essentially constant during September, remaining around 6.0 kWh throughout.
The highest average daily incident shortwave solar energy during September is 6.0 kWh on September 26.
Average Daily Incident Shortwave Solar Energy in September
For the purposes of this report, the geographical coordinates of Comas are -11.717 deg latitude, -75.081 deg longitude, and 12,382 ft elevation.
The topography within 2 miles of Comas contains extreme variations in elevation, with a maximum elevation change of 4,813 feet and an average elevation above sea level of 11,574 feet. Within 10 miles also contains extreme variations in elevation (9,757 feet). Within 50 miles also contains extreme variations in elevation (16,516 feet).
The area within 2 miles of Comas is covered by shrubs (63%) and trees (24%), within 10 miles by shrubs (42%) and grassland (34%), and within 50 miles by shrubs (32%) and trees (29%).
This report illustrates the typical weather in Comas year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Comas 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 Comas, 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 Tables of the Sun, Moon and Planets , 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 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.