The best times to visit Ko Yao Yai for ideal weather are

December 17th to February 25th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.



Other Ko Yao Yai Travel Info

Weather in Ko Yao Yai


Average temperatures in Ko Yao Yai vary barely at all. Considering humidity, temperatures feel hot all year with a chance of rain throughout most of the year. The area is far less temperate than some — in the 8th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Ko Yao Yai, the hottest months are April, March, and then May. See average monthly temperatures below. The warmest time of year is generally early to mid March where highs are regularly around 93.9°F (34.4°C) with temperatures rarely dropping below 78.7°F (25.9°C) at night.

Ko Yao Yai Temperatures (Fahrenheit)


Ko Yao Yai Temperatures (Celsius)


“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Ko Yao Yai Perceived Temperature (F)


Ko Yao Yai Perceived Temperature (C)



Average Ko Yao Yai Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 90.7 82.9 76.8
Feb 92.5 84.2 77.2
Mar 93.3 85 78.2
Apr 92.7 85.1 78.8
May 91.9 84.5 78.7
Jun 91.1 84.2 78.5
Jul 90.2 83.4 77.9
Aug 90.2 83.1 77.7
Sep 89.7 82.6 77.2
Oct 89.7 82.3 76.9
Nov 90 82.6 77.3
Dec 90 82.7 77.2

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 32.6 28.3 24.9
Feb 33.6 29 25.1
Mar 34.1 29.4 25.7
Apr 33.7 29.5 26
May 33.3 29.2 25.9
Jun 32.8 29 25.8
Jul 32.3 28.6 25.5
Aug 32.3 28.4 25.4
Sep 32.1 28.1 25.1
Oct 32.1 27.9 24.9
Nov 32.2 28.1 25.2
Dec 32.2 28.2 25.1



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Ko Yao Yai are February, January, and then December. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early February. For example, on the week of February 5th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in late September with an average of 5 days of significant precipitation the week of September 24th.

When can you find snow in Ko Yao Yai? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Ko Yao Yai.

Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Ko Yao Yai (in).

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 12% 0 2.2
Feb 8% 0 0.9
Mar 21% 0 4.5
Apr 40% 0 7.9
May 48% 0 10.3
Jun 42% 0 10.6
Jul 46% 0 10.8
Aug 47% 0 13.6
Sep 57% 0 15
Oct 50% 0 14.1
Nov 41% 0 8.3
Dec 20% 0 3.8

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 12 0 5.6
Feb 8 0 2.3
Mar 21 0 11.4
Apr 40 0 20.1
May 48 0 26.2
Jun 42 0 26.9
Jul 46 0 27.4
Aug 47 0 34.5
Sep 57 0 38.1
Oct 50 0 35.8
Nov 41 0 21.1
Dec 20 0 9.7


Humidity and Wind

Ko Yao Yai has some very humid months, and above average humidity throughout the year. The least humid month is February (61.6% relative humidity), and the most humid month is October (76.6%).

Wind in Ko Yao Yai is usually extremely calm. The windiest month is July, followed by September and June. July’s average wind speed of around 2.5 knots (2.9 MPH or 4.7 KPH) is considered “light air.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in early August where average top sustained speeds reach 7 knots, which is considered a gentle breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Ko Yao Yai.

Avg. Relative Humidity


The graph below shows wind speed (max and average) in knots.

Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 2.4 Barely noticeable 5.7 Light breeze
Feb 2.2 Barely noticeable 5.7 Light breeze
Mar 2 Barely noticeable 5.7 Light breeze
Apr 1.7 Barely noticeable 5.6 Light breeze
May 1.9 Barely noticeable 5.9 Light breeze
Jun 2.5 Barely noticeable 6.5 Light breeze
Jul 2.5 Barely noticeable 6.4 Light breeze
Aug 2.4 Barely noticeable 6.3 Light breeze
Sep 2.5 Barely noticeable 6.4 Light breeze
Oct 1.9 Barely noticeable 5.9 Light breeze
Nov 1.8 Barely noticeable 5.3 Light breeze
Dec 2.4 Barely noticeable 5.6 Light breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 65.3%
Feb 61.6%
Mar 64.6%
Apr 70%
May 73.6%
Jun 73.3%
Jul 74.2%
Aug 74.3%
Sep 75.8%
Oct 76.6%
Nov 74.1%
Dec 69.4%


Is it Safe to Travel to Ko Yao Yai?

Our best data indicates this area is somewhat safe, but with extra warnings in a few regions. As of Dec 04, 2023 there are travel warnings and regional advisories for Thailand; exercise a high degree of caution and avoid some areas. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Nov 27, 2023.


The Busiest and Least Crowded Months

The busiest month for tourism in Ko Yao Yai, Thailand is January, followed by August and July. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Ko Yao Yai in May. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month


Most Popular Months to Visit

Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is slightly extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 72.3 in May means 72.3% of the tourists vs. January.



Overall Ko Yao Yai Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel warm. Highs range from 93.9°F (34.4°C) and 91.3°F (32.9°C) with similar temperatures in the later months. Rain is very common with 7 to 15 days of significant precipitation per month. Spring is the slowest for tourism, which makes it a good time for those looking for deals.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are quite warm. These months see moderate precipitation with 13 to 15 days of precipitation per month. June – August is the second busiest season for tourism in Ko Yao Yai, so lodging and other accommodations may cost slightly more.

Fall (September through November)

Fall daily highs range from 90.7°F (32.6°C) and 88.6°F (31.4°C), which will feel very nice given the humidity and wind. It rains or snows a great amount: 12 to 17 days per month. Tourism is fairly slow during these months due to the weather, so hotels may be lower priced.

Winter (December through February)

Weather is perfect this time of year in Ko Yao Yai to be enjoyable for warm weather travelers. The average high during this season is between 93°F (33.9°C) and 89.3°F (31.8°C). On average, it rains or snows a fair amount: 2 to 6 times per month. These times of year are the busiest with tourists.


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