September Weather in Shiraz Iran
Daily high temperatures decrease by 8°F, from 95°F to 87°F, rarely falling below 83°F or exceeding 98°F.
Daily low temperatures decrease by 9°F, from 65°F to 56°F, rarely falling below 52°F or exceeding 70°F.
For reference, on July 12, the hottest day of the year, temperatures in Shiraz typically range from 71°F to 99°F, while on January 15, the coldest day of the year, they range from 32°F to 53°F.
Average High and Low Temperature in September in Shiraz
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 Shiraz
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 Shiraz experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 6% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 4% on September 20.
The clearest day of the month is September 20, with clear, mostly clear, or partly cloudy conditions 96% of the time.
For reference, on April 16, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 35%, while on June 16, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 97%.
Cloud Cover Categories in September in Shiraz
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
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 Shiraz is essentially constant, remaining about 0.0 inches throughout, and rarely exceeding 0.2 inches or falling below -0.0 inches.
The lowest average 31-day accumulation is 0.0 inches on September 19.
Average Monthly Rainfall in September in Shiraz
Over the course of September in Shiraz, 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, 45 seconds, and weekly decrease of 12 minutes, 16 seconds.
The shortest day of the month is September 30, with 11 hours, 54 minutes of daylight and the longest day is September 1, with 12 hours, 45 minutes of daylight.
Hours of Daylight and Twilight in September in Shiraz
The latest sunrise of the month in Shiraz is 6:47 AM on September 21 and the earliest sunrise is 59 minutes earlier at 5:48 AM on September 22.
The latest sunset is 7:22 PM on September 1 and the earliest sunset is 1 hour, 35 minutes earlier at 5:46 PM on September 30.
Daylight saving time (DST) ends at 11:00 PM on September 21, 2021, shifting sunrise and sunset to be an hour earlier.
For reference, on June 21, the longest day of the year, the Sun rises at 6:00 AM and sets 14 hours, 3 minutes later, at 8:03 PM, while on December 21, the shortest day of the year, it rises at 6:50 AM and sets 10 hours, 15 minutes later, at 5:05 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in September in Shiraz
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 Shiraz
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 Shiraz is essentially constant during September, remaining around 0% throughout.
For reference, on July 24, 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 Shiraz
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 Shiraz is gradually decreasing during September, decreasing from 6.8 miles per hour to 6.3 miles per hour over the course of the month.
For reference, on July 17, the windiest day of the year, the daily average wind speed is 7.6 miles per hour, while on November 8, the calmest day of the year, the daily average wind speed is 5.8 miles per hour.
Average Wind Speed in September in Shiraz
The wind direction in Shiraz during September is predominantly out of the north from September 1 to September 13 and the west from September 13 to September 30.
Wind Direction in September in Shiraz
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 Shiraz typically lasts for 8.8 months (269 days), from around March 6 to around November 30, rarely starting before February 6 or after March 30, and rarely ending before November 7 or after December 25.
The month of September in Shiraz is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in September in Shiraz
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 Shiraz are rapidly increasing during September, increasing by 756°F, from 4,360°F to 5,116°F, over the course of the month.
Growing Degree Days in September in Shiraz
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 Shiraz is gradually decreasing during September, falling by 1.0 kWh, from 7.6 kWh to 6.6 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in September in Shiraz
For the purposes of this report, the geographical coordinates of Shiraz are 29.610 deg latitude, 52.531 deg longitude, and 5,069 ft elevation.
The topography within 2 miles of Shiraz contains only modest variations in elevation, with a maximum elevation change of 249 feet and an average elevation above sea level of 5,057 feet. Within 10 miles contains only modest variations in elevation (4,373 feet). Within 50 miles also contains extreme variations in elevation (8,527 feet).
The area within 2 miles of Shiraz is covered by artificial surfaces (100%), within 10 miles by shrubs (45%) and sparse vegetation (23%), and within 50 miles by shrubs (44%) and sparse vegetation (25%).
This report illustrates the typical weather in Shiraz, 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, Shiraz International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Shiraz.
At a distance of 10 kilometers from Shiraz, 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 Shiraz 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 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 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.