Average Weather in August in Faleāsao American Samoa
Daily high temperatures are around 84°F, rarely falling below 81°F or exceeding 87°F.
Daily low temperatures are around 77°F, rarely falling below 74°F or exceeding 80°F. The lowest daily average low temperature is 77°F on August 9.
For reference, on March 4, the hottest day of the year, temperatures in Faleāsao typically range from 78°F to 88°F, while on August 5, the coldest day of the year, they range from 77°F to 84°F.
Average High and Low Temperature in August
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on August. 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 August
The month of August in Faleāsao experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 43% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 41% on August 22.
The clearest day of the month is August 22, with clear, mostly clear, or partly cloudy conditions 59% of the time.
For reference, on January 7, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 88%, while on August 22, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 59%.
Cloud Cover Categories in August
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 Faleāsao, the chance of a wet day over the course of August is increasing, starting the month at 17% and ending it at 21%.
For reference, the year's highest daily chance of a wet day is 61% on January 9, and its lowest chance is 16% on July 29.
Probability of Precipitation in August
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 August in Faleāsao is gradually increasing, starting the month at 1.4 inches, when it rarely exceeds 3.2 inches or falls below 0.1 inches, and ending the month at 1.8 inches, when it rarely exceeds 4.1 inches.
The lowest average 31-day accumulation is 1.4 inches on August 7.
Average Monthly Rainfall in August
Over the course of August in Faleāsao, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 20 minutes, implying an average daily increase of 40 seconds, and weekly increase of 4 minutes, 40 seconds.
The shortest day of the month is August 1, with 11 hours, 30 minutes of daylight and the longest day is August 31, with 11 hours, 50 minutes of daylight.
Hours of Daylight and Twilight in August
The latest sunrise of the month in Faleāsao is 6:39 AM on August 1 and the earliest sunrise is 16 minutes earlier at 6:23 AM on August 31.
The earliest sunset is 6:09 PM on August 1 and the latest sunset is 4 minutes later at 6:13 PM on August 31.
Daylight saving time is not observed in Faleāsao during 2020.
For reference, on December 21, the longest day of the year, the Sun rises at 5:47 AM and sets 12 hours, 58 minutes later, at 6:45 PM, while on June 20, the shortest day of the year, it rises at 6:41 AM and sets 11 hours, 17 minutes later, at 5:58 PM.
Sunrise & Sunset with Twilight in August
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 Faleāsao is essentially constant during August, remaining within 0% of 99% throughout.
For reference, on January 1, the muggiest day of the year, there are muggy conditions 100% of the time, while on July 22, the least muggy day of the year, there are muggy conditions 98% of the time.
Humidity Comfort Levels in August
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 Faleāsao is essentially constant during August, remaining within 0.2 miles per hour of 14.9 miles per hour throughout.
For reference, on July 28, the windiest day of the year, the daily average wind speed is 15.2 miles per hour, while on April 7, the calmest day of the year, the daily average wind speed is 10.6 miles per hour.
Average Wind Speed in August
The hourly average wind direction in Faleāsao throughout August is predominantly from the east, with a peak proportion of 85% on August 31.
Wind Direction in August
Faleāsao 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 Faleāsao is essentially constant during August, remaining around 81°F throughout.
The lowest average surface water temperature during August is 81°F on August 13.
Average Water Temperature in August
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 Faleāsao 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 August
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 Faleāsao are very rapidly increasing during August, increasing by 907°F, from 940°F to 1,847°F, over the course of the month.
Growing Degree Days in August
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 Faleāsao is gradually increasing during August, rising by 0.7 kWh, from 4.9 kWh to 5.6 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in August
For the purposes of this report, the geographical coordinates of Faleāsao are -14.222 deg latitude, -169.513 deg longitude, and 0 ft elevation.
The topography within 2 miles of Faleāsao contains very significant variations in elevation, with a maximum elevation change of 1,703 feet and an average elevation above sea level of 179 feet. Within 10 miles contains very significant variations in elevation (3,156 feet). Within 50 miles also contains large variations in elevation (3,156 feet).
The area within 2 miles of Faleāsao is covered by water (99%), within 10 miles by water (100%), and within 50 miles by water (100%).
This report illustrates the typical weather in Faleāsao 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, Pago Pago International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Faleāsao.
At a distance of 130 kilometers from Faleāsao, 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 Faleāsao 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 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.