Best Time to Visit Ko Samui

boat mod (Andy Smith)  CC BY-SA
On this page, you will find information about the climate and the best time to visit Ko Samui. We created climate tables and charts for the location of Na Thon. These contain details about temperatures, precipitation and more.

Furthermore, we analyzed all climate data and provide a recommendation about which months are best to visit Ko Samui for your holiday.

Climate Overview

Thermometer Symbol 24 °C to 33 °C
Waves Symbol 27 °C to 29 °C
Rainy Cloud Symbol 1.320.71 in (4 – 20 Days of Rain)
Show temperatures in degree

Geographical location

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

Koh Samui, Coral Cove Beach (Fabio Achilli)  CC BY 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
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fresh but perfectchilly but ideal
FebruaryFeb
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fresh but perfectchilly but ideal
MarchMar
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PerfectPerf. climate in
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AprilApr
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MayMay
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PerfectPerf. climate in
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JuneJun
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PerfectPerf. climate in
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JulyJul
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PerfectPerf. climate in
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AugustAug
Best time to traveltime
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SeptemberSep
Best time to traveltime
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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

Climate Chart 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)

JanFebMarAprMayJunJulAugSepOctNovDec
Day Temperature29°30°31°32°33°32°32°32°32°31°30°29°
Night Temperature24°25°26°26°26°26°25°25°25°25°24°24°
Water Temperature27°28°28°29°29°29°28°28°28°28°28°27°
Precipitation (inch)5.671.32.013.396.223.665.164.174.4510.4720.718.39
Rainy days845131617161619202014
Hours of Sunshine8781086555678
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 days

For 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!

Popular Activities

More attractions

Mu Ko Ang Thong Park: Semi-private Sunset Cruise Tour | Boat Transfer to Bangkok from Samui, Koh Tao, Koh Phangan | Koh Samui: 4×4 Off Road Island Safari Tour Including Lunch | Koh Samui: Jeep Safari Small Group Tour with Premium Lunch | Koh Samui: Small Group Sightseeing Tour with Premium Lunch | Samui: Angthong National Marine Park Day Trip by Speed Boat | Koh Tao & Koh Nang Yuan Day Trip by Speedboat |

Current Weather and Forecast

Current Weather in Na Thon (Station Ko Samui)
few clouds     few clouds, 32 °C
Clouds: 20 %       Wind: 7 mph SSO
Air Pressure: 1014 hPa       Humidity: 70 %
Last updated: 18th Nov 2018, 05:30 am
The next days …
18th Nov 201819th Nov 201820th Nov 201821st Nov 201822nd Nov 201823rd Nov 2018
sky is clear28 °C to 29 °Csky is clear28 °C to 29 °Clight rain29 °C to 30 °Cheavy intensity rain27 °C to 29 °Clight rain30 °C to 30 °Clight rain30 °C to 30 °C
28 °C to 29 °C28 °C to 29 °C29 °C to 30 °C27 °C to 29 °C30 °C to 30 °C30 °C to 30 °C
Clouds: 0 %Clouds: 0 %Clouds: 88 %Clouds: 55 %Clouds: 38 %Clouds: 91 %
No PrecipitationNo Precipitation0.12 in of rain0.51 in of rain0.03 in of rain0.07 in of rain
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:

Ko Samui: Experiences of our Visitors

There are 5 reviews for Ko Samui holiday already. Average rating is 4 of 5 stars.
  1. Avatar Preview
    Daniel, 41 years old was there in January

    One week in January 3 years ago on Koh Samui and sun full about 28 degrees every day.

    Weather Rating: 5 stars – Excellent

  2. Avatar Preview
    Marion, 61 years old was there in February

    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

  3. Avatar Preview
    Renate, 51 years old was there in August

    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

  4. Avatar Preview
    Ilias, 33 years old was there in May

    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

  5. Avatar Preview
    Laura, 37 years old was there in February

    Summer, sun, sunshine – and that in February! Our honeymoon on Koh Samui was perfect all around, also the weather.

    Weather Rating: 5 stars – Excellent

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Four Seasons Koh Samui (Sarah_Ackerman)  CC BY
peaceful reflection (Jon Rawlinson)  CC BY
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