Ko Samui Weather September Averages, Thailand

    Ko Samui Weather for September 2021

    What's The Weather Like In Ko Samui In September


    The great thing about Ko Samui is that it experiences excellent weather all year round. The island resort, which is Thailand's third-largest island, enjoys tropical weather. The temperatures are usually the same, but rainfall fluctuates drastically. September is the start of the monsoon season in Ko Samui and has an average temperature of 28°C, one degree less than JuneJuly and August.

    The average daily high temperature in September is 31°C, while the average daily low is 25°C, which is still warm by all accounts. This daily highs and lows don't change in the course of the month. 63% of all September days are classified as warm; 37% as hot. After five months of sea temperatures around 28°C, the water temperature drops one degree in September, to 27°C, which, again, is still very warm.

    Sunshine Hours

    With a decrease of only 15 minutes in the course of the month, the length of the days in September is basically constant. The longest day of the month is September 1 with 12.17 hours of daylight; September 30 is the shortest with 12.02 daylight hours. Sunshine is limited to 6 hours per day, the same as the previous four months, as well as October and November. This is due to the fact that September marks the end of the cloudy mini-monsoon or hot season and the start of the very wet and cloudy monsoon season.

    On average, you can experience sunshine on about half of a typical September day.


    And September is cloudy indeed. With an average of 85% of cloud cover, this is about as cloudy as it gets. Historically the cloudiest day of the year is October 5. Cloud cover increases only very slightly throughout the month, from 85% in the beginning to 86% at the end. September 15, a representative day of the month, generally has clear skies 4% of the time, partly cloudy skies 15% of the time and is mostly cloudy 45% of the time. The rest of the time is divided between other less common cloud cover types.


    As the start of the monsoon season, September sees an increase of rainfall compared to the previous months, which, by the way, were already fairly wet. September gets a total of 130mm of precipitation and has 11 days of rainfall. The chance of experiencing rainfall on any given day increases in the course of the month. Precipitation is least likely on September 5 with a 51% chance and most likely on September 30 with a 55% chance.

    The most common types of rainfall, in this order, are light rain, thunderstorms and moderate rain. September has by far the lowest amount of fog days in the year: only two. The average humidity ranges around 80%.

    Ko Samui's weather changes frequently during the day from rainy to sunny and then back to rainy. Most of the holiday-makers will have filtered out of Ko Samui by September as the holiday season will have ended. However, people can still participate in almost all the activities as all the shops and attractions remain open for the entire year.

    Ko Samui Hotels In September

    Renaissance Resort & Spa

    A great place for a tropical holiday is the Renaissance Resort & Spa in Lamai. Located on a hillside that slopes towards the white sands of Lamai beach and the crystal-clear blue waters of the Gulf of Thailand, this five-star resort offers four elegant types of accommodation: Pool Villas, Deluxe Rooms, Royal Lamai Villas and the Lamai & Chomview Suites. All villas and suites have a private terrace, TV, mini-bar, etcetera. Additional amenities are two swimming pools, a fitness centre, sea kayak rental, a wellness centre offering a large selection of treatments and massages, and no less than six drinking and dining options.

    The Banana Leaf serves eastern and western cuisine; Tawann, the signature restaurant, authentic Thai delicacies; Tapas is the place to go for Iberian and Thai food, cocktails and sangria; the Pool Bar speaks for itself; romantic dining can be done at a private table on the beach; and, lastly, you can also choose to have an intimate dinner inside your villa or suite.

    Anantara Resort & Spa

    In Fisherman's Village in Bophut you may want to consider the fantastic five-star Anantara Resort & Spa. This beachside hotel has 106 rooms and suites with amenities such as flat-screen TVs, a rain shower and bathtub, free Wi-Fi, a DVD and CD player and much more. It lies within walking distance of Fisherman's Village and its boutiques, restaurants and bars. Additional amenities and activities on offer include a tennis court, fitness centre, library, spa, infinity pool and Jacuzzi, five places to eat and/or drink, private boat charters, fruit carving classes, Thai boxing classes, and cocktail mixing and cooking classes.

    Ko Samui Beaches For September

    Ko Tao

    Ko Tao is an island that is located a short distance north of Ko Samui. It is a popular place among people who want to get away from all the hustle and bustle of the resort and who are looking for more than the Full Moon Parties on Ko Phangan. The island is focused on divers and snorkellers rather than budget backpackers and there are several companies offering scuba diving courses and trips. The beaches are calm, peaceful and uncrowded, while its surrounding waters lack strong currents and are excellent to learn how to dive.

    A beautiful and relatively unspoilt piece of paradise, Ko Tao is a great place to for a relaxing one- or two-day visit. The island's natural beauty is protected and to minimize impact, visitors are required to take their garbage with them.

    Bars And Restaurants

    Baitong Restaurant

    Baitong Restaurant is the main restaurant of Banana Fan Sea Samui, a stylish resort located right at the beach in Chaweng. It features a large covered dining room and a dozen tables at the actual beach. This is a fabulous place for a tropical dinner on the beach and under the stars. The restaurant serves both Thai and western food. The chef's recommendations include baked New Zealand mussels, the Banana Fan Sea Caesar salad, sea bass filet and pad Thai goong sod. You can go there for breakfast, lunch, snacks and dinner.

    Eat Sense

    Another beachside dining option in Chaweng is Eat Sense. This excellent restaurant serves delicious, authentic and healthy Thai food and uses only natural organic ingredients, fresh seafood and native fruits. Signature dishes are soft shell crab with eggplant in green curry paste and roasted duck in red curry. The setting in incredibly romantic, with candlelit tables next to the beach and al fresco dining.

    The Larder

    Staying in Chaweng, you could also opt to go to The Larder for dinner. Describing itself as a gastro-pub, this great restaurant mixes comfort food with classics. It focuses on atmosphere, which it creates with an unpretentious wooden décor, and ambiance. The Larder serves both modern British and European cuisine. Be aware that reservations are recommended, as this restaurant is usually fully booked.

    Things To Do In Ko Samui In September

    Secret Buddha Garden

    If you want to do something different than lie on the beach and want to soak up some culture rather than sunrays, you may want to visit the Secret Buddha Garden. These gardens, located almost hidden in the hills of inland Ko Samui, were built by a local fruit farmer, Nim Thongsuk, in 1976.

    He began erecting temples and statues on the lush green lands that were owned by his family. It took him fifteen years to finish his garden, which now consists of many statues in all shapes and sizes, depicting deities, human and animals in a wide variety of poses. Each statue and sculpture represents folklore or myths and the locals will be able to tell you the story behind it. When Nim Thongsuk retired, he hired a team of gardeners and landscapers to maintain his garden and opened it to the public.

    The Secret Buddha Garden, also known as Magic Garden and Heaven's Garden, also features a waterfall, a small river and dense tropical jungle. Because it is located in such a remote location, the garden cannot be reached by public road. Instead, you have to follow a military that is only accessible by 4WD. If you don't want to rent a car, you can join a tour. The garden is situated on top of a hill, offering spectacular views of the surrounding area. On your way there, you will pass Ko Samui's highest point, a great lookout point as well.

    Muay Thai match

    Pretty much the complete opposite of a peaceful visit to a statue garden in the jungle is attending a Thai Boxing, or Muay Thai, game. As Thailand's national sport, you will be able to see a Muay Thai match at various locations. The biggest venue on the island, however, is found in Chaweng.

    The Petchbuncha Stadium is located at the entrance of Soi Reggae and has a capacity of 1,500. Thai Boxing is one of the most demanding contact sports in the world and witnessing a match is definitely a unique Thai experience. You can feel the atmosphere and ambiance, created by traditional Javanese clarinets, drums and cymbals, of a real match every single Monday and Friday, from 9pm until midnight.

    Your Holiday Weather Settings

    Show temperature in:
    Show distance in: