Best time to visit Koh Yao
The best time to visit Koh Yao is during the dry season from early-December to early-March when the skies are clear and sunny averaging 28°C (82°F).
Koh Yao weather
Koh Yao enjoys a tropical monsoon climate with warm temperatures year round spread across three distinct seasons: warm – November to February; hot – March to May; and wet – May to October.
The average temperature throughout the year remains a consistent 30°C (86°F).
The warm, dry season from November to March sees the best weather of the year with temperatures ranging between 23°C (73°F) and 31°C (87°F).
What is the best month to visit Koh Yao?
January and February are the best months to visit Koh Yao – since these months see the least rainfall during the year.
December and March are good alternative months, despite the prospect of some additional rainfall.
Which is the hottest month in Koh Yao?
The hottest month of the year in Koh Yao is normally April when maximum daytime temperatures usually reach 33°C (91°F) with very high heat and humidity, and a low of 25°C (77°F).
The hot season from February to April sees daily highs average 33°C (91°F), with the first thunderstorms arriving in April.
Which is the coldest month in Koh Yao?
The 'coldest' month of the year in Koh Yao is December, averaging 27°C (73°F) with an average high of 31°C (87°F) and a low of 23°C (73°F).
Seawater is warm and calm in December.
Which is the sunniest month in Koh Yao?
The sunniest time of year in Koh Yao is usually February with an average of 9 hours of sunshine per day; that's on average 78% of daylight hours.
What is the humidity in Koh Yao?
Koh Yao experiences little significant seasonal variation in perceived humidity, with approximate average relative humidity calculated at between 67% – 81% over the course of the year.
What do the humidity conditions feel like in Koh Yao?
We derive the humidity comfort level – what conditions feel like – from the dew point temperature, which measures moisture content in the atmosphere: a higher dew point feels more humid, while a lower dew point feels drier.
Meteorologists agree that dew point temperature is a more consistant indication of 'absolute humidity' than relative humidity, which fluctuates with temperature.
The average annual dew point in Koh Yao is 24°C (75°F), and varies over the course of the year from humid at 22°C (71°F) to muggy at 25°C (77°F).
Typically, it's humid all year round – almost every day feels muggy.
When is the sea warmest in Koh Yao?
The sea is usually at its warmest in Koh Yao in April when the water temperature reaches 30°C (86°F), which is very pleasant for swimming
The sea in Koh Yao is warm enough to swim year-round.
Which month has the most rain in Koh Yao?
September is usually the wettest month with 323mm (13in) of rainfall on average, while October sees the most wet days – 20 days on average with some rain.
The wet season from late-April to early-December brings hot, humid weather with torrential rain that falls mainly in the afternoon and evening.
Temperatures average 29°C (84°F) with highs of 31°C (87°F) from May onwards. You can also expect high humidity and the seawater becomes cloudy and often rough.
Which is the windiest month in Koh Yao?
The windiest month of the year in Koh Yao is August, with an average hourly wind speed of 10.5 kilometres per hour (6 mph; 5.6 knots).
The windy part of the year lasts from late-May through to early-October, with average wind speeds of more than nine kilometres per hour (5.6 mph; 5 knots).
The less-windy time of year lasts from early-October through to late-May. The calmest month of the year in Koh Yao is April, with an average hourly wind speed of seven kilometres per hour (4 mph; 3.8 knots).
The predominant average hourly wind direction varies throughout the year in Koh Yao.
Best time for activities?
Snorkelling, sunbathing and water sports are best between November and April.
Koh Yao Weather Averages
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| Average high temperature (°C) | |||||||||||
| 32 | 33 | 34 | 33 | 32 | 32 | 31 | 31 | 31 | 31 | 31 | 31 |
| Average low temperature (°C) | |||||||||||
| 23 | 23 | 24 | 25 | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 23 |
| Average daily sunshine (hrs) | |||||||||||
| 9 | 9 | 9 | 8 | 6 | 5 | 6 | 6 | 5 | 6 | 7 | 8 |
| Average daily daylight (hrs) | |||||||||||
| 12 | 12 | 12 | 12 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 |
| Comfort level – heat | |||||||||||
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| Comfort level – humidity (#muggy days) | |||||||||||
| 29 | 28 | 30 | 30 | 31 | 30 | 31 | 31 | 30 | 31 | 30 | 30 |
| Average dew point temperature (°C) | |||||||||||
| 23 | 22 | 24 | 25 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 23 |
| Average relative humidity (%) | |||||||||||
| 71 | 67 | 68 | 74 | 79 | 77 | 77 | 78 | 80 | 81 | 79 | 75 |
| UV Index (max) | |||||||||||
| 11 | 11+ | 11+ | 11+ | 11+ | 11+ | 11+ | 11+ | 11+ | 11+ | 11 | 10 |
| Average days of rainfall (≥1mm) | |||||||||||
| 4 | 3 | 6 | 11 | 17 | 15 | 16 | 16 | 19 | 20 | 16 | 9 |
| Average monthly rainfall (mm) | |||||||||||
| 30 | 22 | 61 | 116 | 213 | 216 | 218 | 254 | 323 | 285 | 183 | 81 |
| Average wind speed (km/h) | |||||||||||
| 9 | 8 | 7 | 7 | 8 | 10 | 10 | 10 | 9 | 8 | 8 | 9 |
| Average sea temperature (°C) | |||||||||||
| 28 | 29 | 29 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 |
| Koh Yao Yai, Thailand | |||||||||||
Holiday seasons
High Season: November to April
Low Season: May to October brings less crowds, cheaper accommodation and, as the locals are quick to point out, it does not rain all day.
Source: Meteorological data for Koh Yao is based on weather statistics gathered for the 36-year period 1980 to 2016 by the Thai Meteorological Department at the closest weather stations: Phuket International Airport (HKT) and Krabi International Airport (KBV), located about 30km (18mi) west of Koh Yao and 40km (24mi) east of Koh Yao, respectively. These stations are deemed sufficiently nearby to be relied upon as the primary source for historical climate records, although weather conditions in Koh Yao may vary slightly.
Advice on the best time to visit a particular destination is based on average local weather statistics, when the weather conditions are generally better than at other times of the year. We consider high and low temperatures, risk of rain (and thunderstorms, etc.), amount of sunshine and sea temperature. For general outdoor activities we favour clear, rainless days with a temperature range between 18°C (64°F) and 27°C (80°F); and for hot-weather activities we favour clear, rainless days with a temperature range between 24°C (75°F) and 32°C (89°F). Often, the best times to visit correspond to high season and therefore involve higher prices.
Latest update: Best time to visit Koh Yao: 18 May, 2024
Disclaimer: The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data and conditions at any given location and time are unpredictable and variable. We assume no responsibility and can not be held legally responsible for any decisions made on the basis of the information presented on this site.
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