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Average Weather in Rayong Thailand

In Rayong, the temperature typically varies from 70°F to 92°F over the course of the year, and is rarely below 64°F or above 95°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature with percentile bands, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDeccomfortablecomfortablewarmwarmhothot
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Sun

The length of the day in Rayong does not vary substantially over the course of the year, staying within 52 minutes of 12 hours throughout. In 2017, the shortest day is December 21, with 11 hours, 23 minutes of daylight; the longest day is June 21, with 12 hours, 52 minutes of daylight.

Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:48 AM on June 2, and the latest sunrise is 53 minutes later at 6:41 AM on January 24. The earliest sunset is at 5:45 PM on November 19, and the latest sunset is 59 minutes later at 6:45 PM on July 9.

Daylight saving time (DST) is not observed in Rayong during 2017.

Sunrise & Sunset with Twilight

The solar day over the course of the year 2017. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Clouds

In Rayong, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Rayong begins around November 13 and lasts for 4.4 months, ending around March 26. On February 7, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 55% of the time, and overcast or mostly cloudy 45% of the time.

The cloudier part of the year begins around March 26 and lasts for 7.6 months, ending around November 13. On May 22, the cloudiest day of the year, the sky is overcast or mostly cloudy 94% of the time, and clear, mostly clear, or partly cloudy 6% of the time.

Cloud Cover

clearerclearerclearerclearercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecMay 2294%May 2294%Feb 745%Feb 745%Nov 1370%Nov 1370%Mar 2670%Mar 2670%overcastovercastmostly cloudymostly cloudypartly cloudypartly cloudymostly clearmostly clearclearclear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Rayong varies very significantly throughout the year.

The wetter season lasts 5.9 months, from May 2 to October 29, with a greater than 42% chance of a given day being a wet day. The chance of a wet day peaks at 81% on September 19.

The drier season lasts 6.1 months, from October 29 to May 2. The smallest chance of a wet day is 2% on December 23.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 81% on September 19.

Daily Chance of Precipitation

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day in the year. Rayong experiences very significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 9.8 months, from February 13 to December 6, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around September 18, with an average total accumulation of 11.1 inches.

The rainless period of the year lasts for 2.2 months, from December 6 to February 13. The least rain falls around December 28, with and average total accumulation of 0.2 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Humidity

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.

Rayong experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 11 months, from January 15 to December 7, during which time the comfort level is muggy, oppressive, or miserable at least 70% of the time. The muggiest day of the year is July 15, with muggy conditions 100% of the time.

The least muggy day of the year is December 29, with muggy conditions 59% of the time.

Humidity Comfort Levels

muggymuggy0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecDec 2959%Dec 2959%100%Jul 15100%Jul 15Jan 1570%Jan 1570%miserablemiserableoppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortable
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

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 Rayong experiences mildly seasonal variation over the course of the year.

The windier part of the year lasts for 3.8 months, from May 16 to September 10, with average wind speeds of more than 5.1 miles per hour. The windiest day of the year is August 6, with an average hourly wind speed of 6.4 miles per hour.

The calmer time of year lasts for 8.2 months, from September 10 to May 16. The calmest day of the year is October 8, with an average hourly wind speed of 3.8 miles per hour.

Average Wind Speed

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Rayong varies throughout the year.

The wind is most often from the south for 4.7 months, from January 16 to June 7 and for 2.0 days, from October 13 to October 15, with a peak percentage of 87% on March 27. The wind is most often from the west for 4.2 months, from June 7 to October 13, with a peak percentage of 70% on August 14. The wind is most often from the north for 1.7 months, from November 4 to December 25, with a peak percentage of 52% on December 5.

Wind Direction

EESSWWEENN0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestwestsouthsoutheasteastnorthnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Rayong 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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.0 months, from April 12 to June 12, with an average temperature above 86°F. The day of the year with the warmest water is May 11, with an average temperature of 87°F.

The time of year with cooler water lasts for 2.3 months, from December 12 to February 21, with an average temperature below 83°F. The day of the year with the coolest water is January 9, with an average temperature of 82°F.

Average Water Temperature

The daily average water temperature (purple line) with percentile bands, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 experiences some seasonal variation over the course of the year.

The brighter period of the year lasts for 2.4 months, from January 15 to March 26, with an average daily incident shortwave energy per square meter above 5.6 kWh. The brightest day of the year is March 4, with an average of 6.0 kWh.

The darker period of the year lasts for 5.7 months, from April 30 to October 20, with an average daily incident shortwave energy per square meter below 4.3 kWh. The darkest day of the year is September 24, with an average of 3.8 kWh.

Average Daily Incident Shortwave Solar Energy

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Rayong are 12.681 deg latitude, 101.258 deg longitude, and 23 ft elevation (map ).

The topography within 2 miles of Rayong contains only modest variations in elevation, with a maximum elevation change of 112 feet, and an average elevation above sea level of 24 feet. Within 10 miles contains very significant variations in elevation (1,027 feet). Within 50 miles contains extreme variations in elevation (3,488 feet).

The area within 2 miles of Rayong is covered by cropland (43%), artificial surfaces (30%), bare soil (14%), and shrubs (11%), within 10 miles by cropland (55%) and water (37%), and within 50 miles by water (57%) and cropland (36%).

Data Sources

This report illustrates the typical weather in Rayong, 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 are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Rayong.

For each station, the records are corrected for the elevation difference between that station and Rayong according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Rayong is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Rayong and a given station.

The stations contributing to this reconstruction are: U-Tapao International Airport (85%, 30 kilometers, west) and Chanthaburi (15%, 94 kilometers, east).

Other Data

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.

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 .