Located on the east coast of Thailand (the Gulf of Thailand), Koh Samui has three seasons: the hot, rainy, and cool (warm) seasons.
The coolest month is December with an average low of 25°C (78°F) and high of 29°C (85°F), so it is still warm then. The driest month is February with almost no rainfall, while being not too hot — another of the best months.
The hottest month is May, with an average high of 33°C (91°F) and low of 27°C (80°F). The highest rainfall comes in October and November — the worst months.

Best Times to Visit Koh Samui
Although Koh Samui is a year-round destination, the best times to visit Koh Samui weather-wise are from December to February. The weather is not-so-hot and mostly sunny, which is very suitable for sightseeing and water sports.
December is the peak travel season in Thailand, especially during the "Western" holiday season (the Christmas / New Year's break). Hotels are easily booked up, and tour costs go up accordingly. Due to the high demand, you're suggested to prepare your tour at least 3 months in advance.
Another best time to visit Koh Samui is from July to September. Thailand's west coast (e.g. Phuket) suffers from monsoon storms during that period, while the east coast, where Koh Samui is located, is far less affected. Thus, Koh Samui is preferred by beachgoers for traveling in those months.
March and April, though they are hot, are still suitable for many water sports, like snorkeling and diving because of the calm sea.
You will find big discounts if you travel between October and November (and in early December) due to the rainy season. It is usually the cheapest time of year to go to Koh Samui.
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Great Experience
WOW! I’ve traveled Asia some & I must say Sharon & Asia Highlights made this trip so much more enjoyable and easy More
Stephen Hollis,
Aug 2023
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Alisa has has been great to work with
Alisa with Asia Highlights has has been great to work with. Very friendly and responsive. More
Ana Rausch,
Aug 2023
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Using Sharon right now to book our…
Using Sharon right now to book our upcoming trip to Thailand. She has booked everything that we asked for. Has answered all of my inquiries, which has been many! Looking forward to having a great girls trip in Thailand More
Tracy,
Aug 2023
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Thailand, Singapore, Bali
In Thailand, Tanny and Nori(Suparp), were both incredible! They were both fun, funny, and full of knowledge and made sure we got the full experience. They went the extra mile and always made sure we had cold bottled water and towels to cleanse our hands. In Singapore, Nicole was an absolute gem. She was so kind and knowledgeable and guided us in the right direction to make our day as enjoyable as possible. She helped us choose a top notch local lunch and coffee spot in China Town and taught us so much about the country! In Bali, Emon was an absolute joy. He was very knowledgeable and kind and absolutely made sure we were feeling comfortable and was willing to be flexible with us. He was fun to converse with and made our time traveling between destinations so enjoyable! I cannot recommend Asia Highlights enough! Accommodations, travel arrangements and guided tours were all a breeze. More
Cassi Thunker,
Jul 2023
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Very supportive
Very supportive ! I have received eticket for Sky Lattern Festival very fast More
Chi?n Nguy?n Ng?c,
Jul 2023
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My experience in Chang Mai with Asia Highlights
I greatly enjoyed my experience with Asia Highlights for a trip I booked to Thailand.All of my interests were catered too. My guide in Chang Mai Gemma was excellent.I truly felt the soul of Thailand culture and Buddhism. More
Richard,
Jul 2023
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A pleasure to plan with
Well, this has been a painless and pleasurable process to find such a wonderful company. I had specific dates and places to be and Sharon worked with me diligently to refine the schedule and costs to suit my travel needs and budget. She informed me of a special tour on the dates I am to be in Thailand and I added that to my previous plans. More
Chris Williams,
Jul 2023
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Large multi-generational holiday in Thailand
The holiday was wonderful. Our guides, Mr Monchai (Bangkok), and Ms Tipagorn (Tippy) (Chiang Mai) were exceptional. Travelling in a large multigenerational group with many children requires patience and our guides truly understood that. Mr Monchai and Ms Tippy shared their extensive knowledge of the many wonderful places we visited, and were flexible to take us to additional places along the way based on discussions. While everyday was busy, having them greet us with patience and a smile truly made this a memorable holiday. The hotels we stayed at were equally wonderful and went above and beyond to celebrate not only my parents 50th anniversary but also celebrate 2 milestone birthdays that occurred. We will cherish this holiday for many years to come. We hope to use Asia Highlights again. More
CL,
Jul 2023
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I never used a travel agent in my life
I never used a travel agent in my life, but Sharon for Asia Highlights did a phenomenal job helping planning and coordination a family vacation. The best part of working with Sharon was that she maintained an open line of communication and provided answers to my question well within 12-24 hours. Additionally, Sharon was flexible and customized our vacation to my families needs. Overall great experience. More
Antione Barry,
Jul 2023
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Great company to plan a trip to Southeast Asia!
Sharon Haung has been wonderful to work with! Very patient and accommodating. Responds immediately given time change and is prepared, prompt, and professional. More
Debi Hinerfeld,
Jul 2023
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We took a 15 days trip (10 days Vietnam and 5 days Thailand …
It was an amazing experience the guides and drivers were there awaiting for us at each airoport for a transfer to the hotels also on time for all the tours all the guides were so lovely , very experienced and spoke very good English , one of the days on tour in Thailand I lost my phone in a temple in Bangkok mr chai went out of his way in a middle of thousands of visitors and managed to find an bring it back to me I found that amazing , also while on a trip I contacted Jason li out tour organizer few time via whatup and he replied and helped on the spot I recommend asiahilights 150% The quality of the service hotels the guides the drivers outstanding From start to finish ABSOLUTELY BRILLIANT ???? More
SIMO el ghobar,
Jun 2023
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Wonderful Guides and Experience
Our large group arrived in Bangkok with Tanni as our guide. She was wonderful! An absolute joy to spend time with. She is knowledgeable, kind, and extremely funny. I don’t know what we would have done without her! After Bangkok, we traveled to Chang Mai, where Indy was our tour guide. She was a delight! She is kind, knowledgeable, and so patient. Our trip to Thailand was an adventure of a lifetime and these two women helped make it memorable. I would definitely use Asia Highlights for any future travel in Asia. More
Jessica Bennett,
Jun 2023
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Guide - Chai
We travelled from Vietnam to Bangkok and were blessed to have a guide named Chai. He was a superb guide and it is a pity we couldn't bottle him and take him home. He was very knowledgeable and an absolute gentleman. He could not have done enough to facilitate us and imparted so much knowledge about the Temples, Buddism and the History of Thailand in general. Not only did he give us a great overview of the past and current ways of living in Thailand but I also feel I came away a much better person having interacting with him. I will carry many of his teachings with me for the rest of my life and know that having met him was a very special blessing in my life. More
Customer,
Jun 2023
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Our guide Tanni was kind
Our guide Tanni was kind, knowledgeable, funny and beyond accommodating for our group. We felt like we'd made a friend and it enhanced our trip in the most positive way. Everything was coordinated perfectly which is not easy to do in a large traveling group. Excellent experience! More
Marissa Manson,
Jun 2023
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We are only on day 5 of our 15 day trip…
Our first stop so far was in Hanoi where our guide Trong was just so awesome! He shared about his culture and family life which showing us sites through a city tour. He was so funny making lots of jokes and always made sure we were having fun while learning about everything! He checked on us frequently even when we were no longer with him since we then went on a cruise in Halong Bay! Halong Bay and the cruise on Paradise Elegance went way above anything I expected. The scenery was breathtaking, the ship was so beautiful and clean with such fresh, good food! And I can’t sing enough praise for the staff who took care of us- especially Anna and Belle! They went above and beyond to make sure we enjoyed every aspect from eating meals with Anna to every other detail with Belle! I highly recommend Asian Highlights to help plan these extraordinary trips! This already has been a trip of a lifetime and we still have so much more to see all thanks to Cathy!! More
Diane Creitz,
Jun 2023
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Tanni for the win!
14 of my closest friends and family descended upon Bangkok ready to see the town. Asia highlights and Tanni took us on a tour that changed our lives. We experienced so much everyday. Tanni was amazing! She did all the thinking for us, so we all could just be present and enjoy the moment. I can’t recommend this company, and especially Tanni enough. More
Megan McGlynn,
Jun 2023
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This isn't my first trip with Asia…
This isn't my first trip with Asia Highlights. They are great at helping me plan, working my requests into the itinerary, and booking it all. We travel with friends and just got back from a trip to Thailand and Vietnam. Albee did a great job with all the details and we had a wonderful time. We will use them for our next adventure! More
Katie Potesta,
Jun 2023
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Amazing service
Although we have not been our trip yet I wanted to still write a review based on customer service and the ease of booking. Alisa has been extremely prompt and responsive with planning our trip to Thailand. She has had great recommendations and guidance to add to our custom itinerary. Highly recommend using Asia highlights! -Alex More
Alex,
May 2023
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I have never hear of this company…
I have never hear of this company before , and after reading all these reviews ,I decided to give it a try . The professionalism and communicative skill received by one of the agent , Sharon of Asia Highlights , convince me that She was the right travel agent for my trip in Asia . Very quickly she communicated with me and got all the detail of my desire vacation . Sharon made me a great itinerary with great experiences that I am dreaming to experience and I am looking forward to it . Thanks Sharon for been so great and crafting me a dream vacation with great suggestions. More
orge alvarez,
May 2023
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Coco Yang worked tirelessly to…
From the moment I landed in Bangkok, Ms Noi Ying was there to welcome me and get me settled into my hotel. We enjoyed several days together touring Bangkok and Kanchanaburi. In Chiang Mai, Mr Ekachai took my son snd I on an amazing trip to the Elephant Jungle Sanctuary and to visit a community Lanna home, gardens and a hands-on cooking class preparing an authentic Thai meal. Lisa arranged a last-minute speedboat tour of 5 breathtaking islands in Phuket. From start to finish, the guides exceeded my expectations!! Thank you, Asia Highlight!! Debbie Woods More
Debbie Woods,
May 2023
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The Worst Times to Visit Koh Samui
October and November are the rainiest months, with an average of 18 rainy days each. If you don't like the rain, then this is the period you should avoid.
But one good thing is that there are fewer people. The rainfall usually hits in the late afternoon or early evening. So, it wouldn't affect your whole visit.
>>>Thailand's Rainy Season: When It Is and 5 Best Places to Go
Peak Season in Koh Samui (December to February)

The most popular time to travel to Koh Samui is from December to February with its comfortable, drier weather.
The nice weather brings more travelers and also higher prices.
December — Coolest Month
- Average low/high temperature: 25/29°C (78/85°F)
December in Koh Samui is the coolest month with some heavy rain showers. But they don't affect holidays much. The rain showers bring refreshing and cool air and are soon gone.
Relaxing in a beach chair or hammock, sunbathing, or taking an evening walk on the beach is pleasant.
Koh Samui is a popular destination for Christmas holidays. There are beach parties and celebrations in many resorts.
January — Cool and Sunny
- Average low/high temperature: 25/30°C (78/85°F)
January is dry and warm with bright sunshine. The good weather is very suitable for all kinds of water sports, like swimming, kayaking, snorkeling, diving, and surfing.
>>>A Guide to the Beaches in Ko Samui
February — Sunniest
- Average low/high temperature: 26/31°C (79/87°F)
February is Koh Samui's driest month. The days are mostly clear and bright. The weather is warm but not too hot. All kinds of sightseeing and outdoor activities are at their most suitable.
>>>Top 5 Things to Do in Koh Samui
Shoulder Season in Koh Samui (March to June)

Koh Samui starts getting hotter from March and moderate rains arrive in May. March and April are still good for a visit — bright with low rainfall.
March — Still Sunny
- Average low/high temperature: 27/32°C (80/89°F)
Although March becomes hotter, it still a good month for a visit to Koh Samui. In March, Koh Samui has relatively fewer tourists. The monsoon rain has not yet come. The sea is calm and very suitable for water activities.
April — Hot
- Average low/high temperature: 27/32°C (81/90°F)
April in Koh Samui is about the same as March: low rainfall and quite hot.
Songkran Festival (Thai New Year) falls on April 13–15. Water "battles" are the main activity. People attack each other with spray guns to express good wishes… and also disperse the heat.
May — Hot and Wet
- Average low/high temperature: 27/33°C (81/91°F)
May is the hottest month in Koh Samui, and rainfall begins to increase in May. You may feel it's a little too muggy with the hot and wet weather.
Air-conditioned places can be a good choice to ease the discomfort, like at a beach resort, shopping malls, or cafés.
June — Staying Hot
- Average low/high temperature: 27/32°C (81/90°F)
The weather in June in Koh Samui is much the same as in May, just slightly less rainy.
At the end of June, many schools begin their summer vacation. You will see some parents with their children on holiday there.
Second Peak Season in Koh Samui (July to September)

From July to September, Koh Samui is one of the areas less affected by the monsoon. Thus, it becomes many travelers' choice for a Thai beach holiday.
Compared to Phuket, Koh Samui is still mostly sunny during this time of year, with plenty of water activities available.
July — Sunny, Some Showers
- Average low/high temperature: 27/32°C (80/89°F)
July in Koh Samui is mostly sunny. July is the summer vacation and you can expect many travelers from all over the world.
July is also the season for many honeymooners. Koh Samui's romantic vibe and stunning scenery offer couples an ideal wedding/anniversary destination.
>>>8 Best Places for Honeymoons/Anniversaries in Thailand
August — Still Sunny with Isolated Showers
- Average low/high temperature: 27/32°C (80/89°F)
The weather in August stays the same as in July. Most days are bright. There may be some rainy days, but they only contain short-lived showers.
Outdoor activities like snorkeling are still suitable. Exploring markets and taking a Thai cooking class are also great options that are less affected by a shower.
>>>7 Local Markets and Walking Streets in Koh Samui
September — Fine Weather
- Average low/high temperature: 27/31°C (80/88°F)
Sunny days prevail in the first half of September in Koh Samui. The end of summer vacation also makes it a little quieter.
There will be more rain in September than in August, but overall, there will still be more sunny days than rainy days in September.
Low Season in Koh Samui (October to November)

October and November are the rainy season in Koh Samui, which arrives later than in most parts of Thailand.
The rainy season sees fewer visitors, making travel costs relatively affordable.
October — Cloudy and Rainy
- Average low/high temperature: 27/32°C (81/90°F)
Though October is the beginning of the rainy season, heavy rainfall mainly arrives during the second half the month. It rains in the form of short afternoon thunderstorms, and it's cloudy most of the time.
November — Rainiest Month
- Average low/high temperature: 27/32°C (81/90°F)
Monsoonal rainfall is at its peak in November in Koh Samui. You would see frequent heavy downpours/thunderstorms.
Water sports are not practicable/safe in these rainy and windy days. The sea can be very rough. Indoor activities, like a Thai spa or a cooking class, are recommended.
Popular Koh Samui Tours
We can create an ideal Koh Samui trip for you based on your group size, time, budget, interests, preferences, and other requirements. Contact us.
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