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License Information available under 'Proof of Image Sources'")
Furthermore, we analyzed all climate data and provide a recommendation about which months are best to visit Ko Samui for your holiday.
Climate Overview
24 °C to 33 °C
27 °C to 29 °C
1.3 – 20.71 in (4 – 20 Days of Rain)Show temperatures in degree
Geographical location
Table of Contents
Koh Samui (other spellings: Ko Samui or also only Samui) is together with the island Phuket one of the most popular holiday destinations in Southeast Asia and represents with about 150 miles² the third largest island in Thailand.
In the vicinity of other paradises such as Ko Tao, palm-fringed Koh Samui is protected in the Gulf of Thailand and enchants travellers from all over the world with its fantastic beaches and excellent hotel resorts.
Together with about 100 islands from Koh Phangan to the Ang Thong Islands, the island is part of the so-called Samui Archipelago. Koh Samui airport is located in the northeastern part of the island, and a ring-shaped coastal road connects all regions.
In the southwest the Khao Thai Kwai, the highest mountain on Koh Samui, rises over 630 meters in height, despite the tourism boom in Thailand there are still sleepy villages, small fishing harbours and a lot of idyll.
The most popular and busiest resorts on Koh Samui are Chaweng on the east coast and Lamai in the south of the island. Thailand tours usually start from Bangkok and combine the inland like Chiang Mai and Chiang Rai in the north with a bathing stay on Phuket, Koh Samui or one of the smaller islands.
Climate on Koh Samui
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In contrast to many other regions in Thailand and the entire region of Southeast Asia, Koh Samui can be described as a year-round destination with only a few cuts, although temperatures only drop below 23 °C at night in exceptional cases, even in the supposedly”cooler” season.
In fact, there are up to three different seasons on Koh Samui, but you can’t compare the differences with the seasons in Europe. The rainy season on Koh Samui lasts from mid-September to December, the climate is now very humid and the weather can be very humorous, especially in November and December. Longer monsoon rain showers and sometimes strong storms can therefore affect the holiday at this time.
But you might as well be lucky and meet fantastic weather (at reasonable low season prices). By the turn of the year at the latest, it will be much drier, from March the hot season will begin, and there will be almost no more wind. In May there will be more rain showers again, but these are more welcome refreshments from above.
Best Time to Visit Ko Samui: Overview
JanuaryJan Best time to traveltime fresh but perfectchilly but ideal | FebruaryFeb Best time to traveltime fresh but perfectchilly but ideal | MarchMar Best time to traveltime PerfectPerf. climate in Koh Samui | AprilApr Best time to traveltime PerfectPerf. climate in Koh Samui | MayMay Best time to traveltime PerfectPerf. climate in Koh Samui | JuneJun Best time to traveltime PerfectPerf. climate in Koh Samui |
JulyJul Best time to traveltime PerfectPerf. climate in Koh Samui | AugustAug Best time to traveltime PerfectPerf. climate in Koh Samui | SeptemberSep Best time to traveltime PerfectPerf. climate in Koh Samui | OctoberOct Rainy Season Koh SamuiRainy Season up to 10.47 in of rainof rain | NovemberNov Rainy Season Koh SamuiRainy Season up to 20.71 in of rainof rain | DecemberDec End of Rainy SeasonEnd of Rainy Season up to 8.39 in of rainof rain |
When to go to Koh Samui?
If you want to be on the safe side, avoid the rainy months on Koh Samui. By far the most rain falls in November, followed by October, December and May. Nevertheless, especially in the supposed rainy season fantastic bargains lure on Thailand’s islands, but you should be aware of the risk that the holiday could fall into the water under certain circumstances.
In principle, the months January to March are considered the best travel season on Koh Samui. But even the much hotter months of April to September can be recommended as travel season despite several rainy days.
The tropical climate ensures hot temperatures all year round and quite high humidity. Most tourists come – due to the European summer holidays – between July and the beginning of September, so please do not misunderstand us: Even in summer you can enjoy an unforgettable holiday on Koh Samui!
Climate Chart Ko Samui
Na Thon
Show temperatures in degree
Source of Data: German Weather Service (Offenbach) and Wikipedia
Climate Table Ko Samui
In the following, you will find the climate table for Ko Samui, containing information about Temperatures, Precipitation, Water Temperatures, and Hours of Sunshine.Temperatures, Precipitation, Sunshine in Na Thon (Ko Samui)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Day Temperature | 29° | 30° | 31° | 32° | 33° | 32° | 32° | 32° | 32° | 31° | 30° | 29° |
| Night Temperature | 24° | 25° | 26° | 26° | 26° | 26° | 25° | 25° | 25° | 25° | 24° | 24° |
| Water Temperature | 27° | 28° | 28° | 29° | 29° | 29° | 28° | 28° | 28° | 28° | 28° | 27° |
| Precipitation (inch) | 5.67 | 1.3 | 2.01 | 3.39 | 6.22 | 3.66 | 5.16 | 4.17 | 4.45 | 10.47 | 20.71 | 8.39 |
| Rainy days | 8 | 4 | 5 | 13 | 16 | 17 | 16 | 16 | 19 | 20 | 20 | 14 |
| Hours of Sunshine | 8 | 7 | 8 | 10 | 8 | 6 | 5 | 5 | 5 | 6 | 7 | 8 |
Show temperatures in degree
Temperatures
The annual average temperature in Na Thon is 28 °C.For comparison: London 11 °C, NYC 12 °C, LA 17.9 °C
Warmest month: April (29.2 °C)
Coldest month: December (26.5 °C)
The maximum water temperature in Na Thon is 29 °C. You can take a bath at these temperatures.
Months with water temperature of at least 21 °C (adequate for beach vacation):
all months
Precipitation
Overall annual precipitation: 75.59 inch on 168 rainy daysFor comparison: London 24.06 in, NYC 41.57 in, LA 12.01 in
Rainy season (months with more than 6.9 in of precipitation): October, November, and December
Overall precipitation in the rainy season: 39.57 in
You cannot expect snow in any month in Na Thon.
Sunshine
As our climate table shows, April is the sunniest month with an average of 9.7 hours of sunshine per day. Over the year, there are 6.9 hours of sunshine per day on average. For comparison: London has 4.1, NYC has 7 and LA has 8.9 hours of sunshine per day on average.Sights and Highlights
Similar to Phuket and Koh Phangan, Koh Samui is especially popular with seaside vacationers, but the island in the Gulf of Thailand has much more to offer than just lying on its rotten skin under the sun. The great weather makes unforgettable excursions possible despite the high temperatures:
The sights of Koh Samui include for example the Big Buddha with 12 meters height as well as the inspiring temple complex Wat Plai Laem, also the mummified monk in Wat Khunaram is worth a visit. In the open air, not only the bizarre rock formations in Lamai await you, but also a magnificent viewpoint above Lamai Beach.
Also a tour to the Na Mueang waterfall should not be missing on any Koh Samui trip, especially in the rainy season huge water masses rush down here. The boat trip to the famous Angthong National Marine Park is also very popular. Our recommendations for the most beautiful beaches of Koh Samui:
Silver Beach has long since ceased to be an insider tip and is as busy as Lamai and Chaweng Beach. Instead, go to the incomparable Maenam Beach, Bang Po Beach or Choeng Mon Beach. Despite the danger of confusion, Chaweng Noi Beach is also worth a recommendation!
More information about the best things to do: Thailand
Popular Activities
Ko Samui: 4WD Wild Jungle Safari Tour with Lunch
Tours
from 53 $ »
Enjoy a half-day tour to see the highlights of Koh Samui such as Grandfathers/Grandmother rocks, Mummified Monk, Namuang Waterfall, and Buddha’s Magic Garden. Enjoy the fun experience up to the mountain and see some lovely viewpoints by a 4X4 army jeep.
Mu Ko Ang Thong Park: Semi-private Sunset Cruise Tour
Tours
from 122 $ »
Avoid the crowds on this relaxing sailing cruise aboard a luxurious yacht to the limestone islands of Mu Ko Ang Thong Marine Park. Enjoy snorkeling at the best spot in the park, climb to the Emerald Lake and admire a beautiful sunset.
Koh Samui: Private Car or Minibus Rental with Driver
Transfers
from 88 $ »
Rent a vehicle with a private, English-speaking driver and explore Samui at your own pace. Visit the main attractions according to your choice and enjoy the flexibility of an itinerary without the hassle of an organized tour.
More attractions
Koh Samui: Ethical Elephant Home Guided Tour with Transfers | Samui: Angthong National Marine Park Day Trip by Speedboat | Koh Samui: 4×4 Off Road Island Safari Tour Including Lunch | Koh Samui: Ethical Elephant Sanctuary Interactive Tour | Ang Thong Marine Park: Full-Day Kayaking & Snorkeling Tour | Koh Samui: ATV Quad Bike Safari Tour | Samui International Airport: Private Hotel Transfer |Current Weather and Forecast
Current Weather in Na Thon (Station Ko Samui)
few clouds, 30 °CClouds: 20 % Wind: 7 mph OSO
Air Pressure: 1010 hPa Humidity: 66 %
Air Pressure: 1010 hPa Humidity: 66 %
Last updated: 7th Feb 2023, 09:28 am
The next days …
| 7th Feb 2023 | 8th Feb 2023 | 9th Feb 2023 | 10th Feb 2023 | 11th Feb 2023 | 12th Feb 2023 |
|---|---|---|---|---|---|
 26 °C to 27 °C |  27 °C to 27 °C | 27 °C to 27 °C | 27 °C to 28 °C |  27 °C to 27 °C | 26 °C to 27 °C |
| 26 °C to 27 °C | 27 °C to 27 °C | 27 °C to 27 °C | 27 °C to 28 °C | 27 °C to 27 °C | 26 °C to 27 °C |
| Clouds: 83 % | Clouds: 40 % | Clouds: 66 % | Clouds: 71 % | Clouds: 32 % | Clouds: 36 % |
| No Precipitation | 0.01 in of rain | 0.01 in of rain | 0 in of rain | No Precipitation | No Precipitation |
Weather information provided by OpenWeatherMap. (CC BY-SA)
Show temperatures in degree
Thailand: Regions
Ko Samui is part of the holiday destination Thailand. We analyzed the climate for additional regions, in order to provide you with information about the best time to visit and the expected holiday weather:Best Time to Travel for the Regions
Na Thon: all except October, November, and December
Hottest Month
May: 33 °C
Day Temperature in Na Thon
May: 33 °CDay Temperature in Na Thon
Coldest Month
December: 24 °C
Night Temperature in Na Thon
December: 24 °CNight Temperature in Na Thon
Rainiest Month
November: 20.71 in
Rain in Na Thon
November: 20.71 inRain in Na Thon
Driest Month
February: 1.3 in
Rain in Na Thon
February: 1.3 inRain in Na Thon
Maximum Water Temperature
April: 29 °C
Water Temperature in Na Thon
April: 29 °CWater Temperature in Na Thon
Sunniest Month
April: 9.7 hours/day
Sunshine in Na Thon
April: 9.7 hours/daySunshine in Na Thon
Activities and Attractions
From Koh Samui: Island Hopping with Snorkeling and Lunch
Tours
from 80 $ »
From Ko Tao: Samui & Koh Nang Yuan Day Tour Speedboat Ticket
Tours
from 81 $ »
Samui: Feeding Program at the Elephant Home Nursery
Tours
from 28 $ »
Distances to Ko Samui
| London | New York | Los Angeles | |
|---|---|---|---|
| Na Thon | 6140 mi | 8950 mi | 8520 mi |
Where’s Ko Samui?
Show Na Thon on MapContinent: Asia
All Holiday Destinations in AsiaShare your Experience and Win
We want to know: how was the weather during your Ko Samui holiday? You can win a travel coupon of 1000 $. The price will be raffled among all submissions.
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Ko Samui: Experiences of our Visitors
One week in January 3 years ago on Koh Samui and sun full about 28 degrees every day.
Weather Rating: 5 stars – Excellent
I have been to Koh Samui 3 times in the last 10 years ( Febr., Dec., January) and every year after 5 days of continuous rain we left the island and moved our holidays to Phuket or Koh Samet !! A dream island but the weather is unfortunately capricious!!
Weather Rating: 1 stars – Mostly bad
We had sunshine every day, sometimes a little cloudy. At night it often rained very heavily, in the morning the sun was shining again. During the day we had only twice for about 1-2 hours of rain, but very heavy 🙂
Weather Rating: 5 stars – Excellent
It was incredibly hot but always sunny. My pearl loved it, for me personally it was too much in the midday sun. On the other hand we had no rain except for a short 5 minutes shower and that is already worth its weight in Thailand
Weather Rating: 4 stars – Good
Summer, sun, sunshine – and that in February! Our honeymoon on Koh Samui was perfect all around, also the weather.
Weather Rating: 5 stars – Excellent