The best times to visit Koh Samet for ideal weather are

November 26th to February 18th

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



Other Koh Samet Travel Info

Weather in Koh Samet


Average temperatures in Koh Samet vary very little. Considering humidity, temperatures feel hot all year with a fair chance of precipitation about half of the year. The area is less temperate than some — in the 13th 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 Koh Samet, the hottest months are May, April, and then June. See average monthly temperatures below. The warmest time of year is generally mid April where highs are regularly around 92.7°F (33.7°C) with temperatures rarely dropping below 81.9°F (27.7°C) at night.

Koh Samet Temperatures (Fahrenheit)


Koh Samet 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.

Koh Samet Perceived Temperature (F)


Koh Samet Perceived Temperature (C)



Average Koh Samet 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 88.3 79.6 71
Feb 88.8 82.2 76
Mar 90.3 84.3 78.6
Apr 92 86.1 80.1
May 91.3 86.2 80.6
Jun 90.2 85.4 79.9
Jul 89.2 84.6 79.6
Aug 89.5 84.5 78.9
Sep 88.9 83.6 77.8
Oct 89.4 82.2 76.3
Nov 90.6 82.1 74.8
Dec 89.5 80.2 71.7

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 31.3 26.4 21.7
Feb 31.6 27.9 24.4
Mar 32.4 29.1 25.9
Apr 33.3 30.1 26.7
May 32.9 30.1 27
Jun 32.3 29.7 26.6
Jul 31.8 29.2 26.4
Aug 31.9 29.2 26.1
Sep 31.6 28.7 25.4
Oct 31.9 27.9 24.6
Nov 32.6 27.8 23.8
Dec 31.9 26.8 22.1



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Koh Samet are December, January, and then February. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early December. For example, on the week of December 3rd there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in early to mid September with an average of 4 days of significant precipitation the week of September 10th.

When can you find snow in Koh Samet? 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 Koh Samet.

Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Koh Samet (in).

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 6% 0 1.3
Feb 8% 0 1.3
Mar 10% 0 2
Apr 13% 0 2.8
May 31% 0 8.4
Jun 41% 0 8
Jul 31% 0 8
Aug 30% 0 7.1
Sep 46% 0 11
Oct 42% 0 9.9
Nov 14% 0 2.1
Dec 2% 0 0.4

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 6 0 3.3
Feb 8 0 3.3
Mar 10 0 5.1
Apr 13 0 7.1
May 31 0 21.3
Jun 41 0 20.3
Jul 31 0 20.3
Aug 30 0 18
Sep 46 0 27.9
Oct 42 0 25.1
Nov 14 0 5.3
Dec 2 0 1


Humidity and Wind

Koh Samet has some very humid months, and above average humidity throughout the year. The least humid month is December (63.6% relative humidity), and the most humid month is October (77.9%).

Wind in Koh Samet is usually extremely calm. The windiest month is June, followed by July and August. June’s average wind speed of around 5.2 knots (6 MPH or 9.7 KPH) is considered “a light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in mid June where average top sustained speeds reach 11.1 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Koh Samet.

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 3.1 Barely noticeable 7.9 Gentle breeze
Feb 3.9 Barely noticeable 8.8 Gentle breeze
Mar 4.3 Light breeze 8.6 Gentle breeze
Apr 3.8 Barely noticeable 8.2 Gentle breeze
May 4.2 Light breeze 9.1 Gentle breeze
Jun 5.2 Light breeze 10.2 Gentle breeze
Jul 5.2 Light breeze 10.3 Gentle breeze
Aug 4.7 Light breeze 9.8 Gentle breeze
Sep 3.7 Barely noticeable 9.2 Gentle breeze
Oct 2.6 Barely noticeable 7.7 Gentle breeze
Nov 3.1 Barely noticeable 7.5 Gentle breeze
Dec 3.1 Barely noticeable 7.6 Gentle breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 65%
Feb 72.2%
Mar 71.9%
Apr 71.9%
May 72.9%
Jun 73.9%
Jul 74.4%
Aug 74%
Sep 77.2%
Oct 77.9%
Nov 68.4%
Dec 63.6%


Is it Safe to Travel to Koh Samet?

Our best data indicates this area is somewhat safe, but with extra warnings in a few regions. As of Oct 07, 2019 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 Aug 22, 2019.


The Busiest and Least Crowded Months

The busiest month for tourism in Koh Samet, Thailand is December, followed by May and January. 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 Koh Samet in September. 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 somewhat extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 65.1 in September means 65.1% of the tourists vs. December.



Overall Koh Samet Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel very warm. Highs range from 92.7°F (33.7°C) and 89.6°F (32°C) with similar temperatures in the later months. Rain is somewhat common with 3 to 10 days of significant precipitation per month. Spring is fairly slow 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 9 to 12 days of precipitation per month. June – August is the second busiest season for tourism in Koh Samet, 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 87.9°F (31.1°C), which will feel very nice given the humidity and wind. It rains or snows a good amount: 4 to 14 days per month. Tourism is the slowest during these months due to the weather, so hotels may be affordably priced.

Winter (December through February)

Weather is perfect this time of year in Koh Samet to be enjoyable for warm weather travelers. The average high during this season is between 89.9°F (32.2°C) and 87.7°F (30.9°C). On average, it rains or snows a smalll amount: 1 to 2 times per month. These times of year are the busiest with tourists.


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