Fall Weather in Nha Trang Vietnam

Daily high temperatures decrease by 8°F, from 89°F to 82°F, rarely falling below 78°F or exceeding 92°F.

Daily low temperatures decrease by 4°F, from 79°F to 74°F, rarely falling below 71°F or exceeding 81°F.

For reference, on June 10, the hottest day of the year, temperatures in Nha Trang typically range from 80°F to 90°F, while on January 23, the coldest day of the year, they range from 71°F to 80°F.

The figure below shows you a compact characterization of the hourly average fall temperatures. 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.

Colonia Emiliano Zapata, Mexico (9,858 miles away) is the far-away foreign place with temperatures most similar to Nha Trang (view comparison).

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The fall in Nha Trang experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 95% to 73%.

The clearest day of the fall is November 28, with clear, mostly clear, or partly cloudy conditions 27% of the time.

For reference, on June 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 96%, while on March 2, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 48%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Nha Trang, the chance of a wet day over the course of the fall is gradually decreasing, starting the season at 38% and ending it at 34%.

For reference, the year's highest daily chance of a wet day is 53% on October 9, and its lowest chance is 3% on February 19.

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the fall in Nha Trang is rapidly increasing, starting the season at 3.8 inches, when it rarely exceeds 7.2 inches or falls below 0.9 inches, and ending the season at 5.7 inches, when it rarely exceeds 15.3 inches or falls below 0.4 inches.

The highest average 31-day accumulation is 8.9 inches on October 26.

Over the course of the fall in Nha Trang, the length of the day is decreasing. From the start to the end of the season, the length of the day decreases by 53 minutes, implying an average daily decrease of 35 seconds, and weekly decrease of 4 minutes, 7 seconds.

The shortest day of the fall is November 30, with 11 hours, 28 minutes of daylight and the longest day is September 1, with 12 hours, 21 minutes of daylight.

The earliest sunrise of the fall in Nha Trang is 5:32 AM on September 29 and the latest sunrise is 16 minutes later at 5:47 AM on November 30.

The latest sunset is 5:53 PM on September 1 and the earliest sunset is 39 minutes earlier at 5:14 PM on November 18.

Daylight saving time is not observed in Nha Trang during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:19 AM and sets 12 hours, 51 minutes later, at 6:10 PM, while on December 21, the shortest day of the year, it rises at 5:59 AM and sets 11 hours, 24 minutes later, at 5:23 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for the fall of 2024. 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.

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 Nha Trang is decreasing during the fall, falling from 100% to 94% over the course of the season.

For reference, on June 6, the muggiest day of the year, there are muggy conditions 100% of the time, while on January 25, the least muggy day of the year, there are muggy conditions 78% of the time.

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 Nha Trang is very rapidly increasing during the fall, increasing from 6.7 miles per hour to 14.6 miles per hour over the course of the season.

For reference, on December 13, the windiest day of the year, the daily average wind speed is 15.3 miles per hour, while on September 14, the calmest day of the year, the daily average wind speed is 6.3 miles per hour.

The lowest daily average wind speed during the fall is 6.3 miles per hour on September 14.

The wind direction in Nha Trang during the fall is predominantly out of the south from September 1 to September 27 and the north from September 27 to November 30.

Nha Trang 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 Nha Trang is decreasing during the fall, falling by 5°F, from 84°F to 79°F, over the course of the season.

The highest average surface water temperature during the fall is 84°F on September 13.

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 Nha Trang 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.

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 Nha Trang are very rapidly increasing during the fall, increasing by 2,736°F, from 7,495°F to 10,231°F, over the course of the season.

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 Nha Trang is gradually increasing during the fall, rising by 0.6 kWh, from 3.8 kWh to 4.5 kWh, over the course of the season.

The lowest average daily incident shortwave solar energy during the fall is 3.8 kWh on September 16.

For the purposes of this report, the geographical coordinates of Nha Trang are 12.245 deg latitude, 109.194 deg longitude, and 33 ft elevation.

The topography within 2 miles of Nha Trang contains significant variations in elevation, with a maximum elevation change of 548 feet and an average elevation above sea level of 19 feet. Within 10 miles contains significant variations in elevation (3,238 feet). Within 50 miles contains large variations in elevation (7,598 feet).

The area within 2 miles of Nha Trang is covered by water (56%) and cropland (27%), within 10 miles by water (49%) and cropland (21%), and within 50 miles by water (53%) and trees (21%).