September Weather in Quảng Yên Vietnam
Daily high temperatures are around 87°F, rarely falling below 81°F or exceeding 93°F.
Daily low temperatures decrease by 2°F, from 79°F to 77°F, rarely falling below 73°F or exceeding 82°F.
For reference, on June 27, the hottest day of the year, temperatures in Quảng Yên typically range from 80°F to 89°F, while on January 24, the coldest day of the year, they range from 59°F to 66°F.
Average High and Low Temperature in September in Quảng Yên
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 Quảng Yên
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
South Padre Island, Texas, United States (8,821 miles away) and Redington Shores, Florida, United States (9,016 miles) are the far-away foreign places with temperatures most similar to Quảng Yên (view comparison).
The month of September in Quảng Yên experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 83% to 63%.
The clearest day of the month is September 30, with clear, mostly clear, or partly cloudy conditions 37% of the time.
For reference, on June 12, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 92%, while on February 22, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 71%.
Cloud Cover Categories in September in Quảng Yên
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 Quảng Yên, the chance of a wet day over the course of September is very rapidly decreasing, starting the month at 58% and ending it at 34%.
For reference, the year's highest daily chance of a wet day is 61% on August 24, and its lowest chance is 6% on December 30.
Probability of Precipitation in September in Quảng Yên
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 Quảng Yên is very rapidly decreasing, starting the month at 9.3 inches, when it rarely exceeds 15.2 inches or falls below 3.9 inches, and ending the month at 5.1 inches, when it rarely exceeds 9.4 inches or falls below 1.7 inches.
Average Monthly Rainfall in September in Quảng Yên
Over the course of September in Quảng Yên, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 34 minutes, implying an average daily decrease of 1 minute, 11 seconds, and weekly decrease of 8 minutes, 15 seconds.
The shortest day of the month is September 30, with 11 hours, 58 minutes of daylight and the longest day is September 1, with 12 hours, 32 minutes of daylight.
Hours of Daylight and Twilight in September in Quảng Yên
The earliest sunrise of the month in Quảng Yên is 5:36 AM on September 1 and the latest sunrise is 7 minutes later at 5:43 AM on September 30.
The latest sunset is 6:08 PM on September 1 and the earliest sunset is 27 minutes earlier at 5:41 PM on September 30.
Daylight saving time is not observed in Quảng Yên during 2021.
For reference, on June 21, the longest day of the year, the Sun rises at 5:12 AM and sets 13 hours, 24 minutes later, at 6:36 PM, while on December 21, the shortest day of the year, it rises at 6:24 AM and sets 10 hours, 52 minutes later, at 5:16 PM.
Sunrise & Sunset with Twilight in September in Quảng Yên
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 Quảng Yên
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 Quảng Yên is decreasing during September, falling from 99% to 94% over the course of the month.
For reference, on July 25, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 26, the least muggy day of the year, there are muggy conditions 17% of the time.
Humidity Comfort Levels in September in Quảng Yên
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 Quảng Yên is increasing during September, increasing from 6.7 miles per hour to 7.9 miles per hour over the course of the month.
For reference, on January 18, the windiest day of the year, the daily average wind speed is 9.1 miles per hour, while on August 20, the calmest day of the year, the daily average wind speed is 6.4 miles per hour.
Average Wind Speed in September in Quảng Yên
The wind direction in Quảng Yên during September is predominantly out of the south from September 1 to September 4 and the east from September 4 to September 30.
Wind Direction in September in Quảng Yên
Quảng Yên 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 Quảng Yên is essentially constant during September, remaining within 1°F of 84°F throughout.
Average Water Temperature in September in Quảng Yên
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 Quảng Yên 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 in Quảng Yên
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 Quảng Yên are very rapidly increasing during September, increasing by 925°F, from 6,044°F to 6,970°F, over the course of the month.
Growing Degree Days in September in Quảng Yên
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 Quảng Yên is gradually increasing during September, rising by 0.6 kWh, from 4.7 kWh to 5.3 kWh, over the course of the month.
The highest average daily incident shortwave solar energy during September is 5.3 kWh on September 29.
Average Daily Incident Shortwave Solar Energy in September in Quảng Yên
For the purposes of this report, the geographical coordinates of Quảng Yên are 20.942 deg latitude, 106.803 deg longitude, and 30 ft elevation.
The topography within 2 miles of Quảng Yên contains only modest variations in elevation, with a maximum elevation change of 135 feet and an average elevation above sea level of 17 feet. Within 10 miles contains only modest variations in elevation (1,781 feet). Within 50 miles contains very significant variations in elevation (3,789 feet).
The area within 2 miles of Quảng Yên is covered by cropland (40%), grassland (18%), water (14%), and trees (14%), within 10 miles by water (32%) and cropland (26%), and within 50 miles by water (37%) and cropland (25%).
This report illustrates the typical weather in Quảng Yên, 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, Noi Bai International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Quảng Yên.
At a distance of 108 kilometers from Quảng Yên, 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 Quảng Yên 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.
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