This article is about the weather and travel in September in Thailand. Learn more about average temperatures, rainfall, and tips on what to wear and places to go in September.
Thailand Weather in September: Overview
- Average temperature range: 26–32°C (79–89°F)
- Average rainfall: 137 mm (5.4 inches)
- Rainy days: 17–22
- Sunny days: 5
September is the wettest month in Thailand, especially in the southwest (Phuket etc.), with an average rainfall of about 330 mm (13 in) across the country's popular travel destinations. Heavy downpours are expected most days in the afternoon and evening.
The weather remains hot. However, temperatures continue to decline gradually throughout the month, with an average temperature of 28°C (82°F).
Thailand's Regional Weather in September
|Location||Min. Temp. (ºC)||Max. Temp. (ºC)||Rainfall (mm)|
Bangkok and central Thailand: In September, the weather in Bangkok is quite warm, with daytime temperatures of around 30°C (86°F) and nighttime temperatures of about 25°C (77°F). Rainfall usually occurs in the afternoon and evening in short stormy bursts of one to two hours. When planning your tour, you could schedule outdoor sight-seeing for the morning, to avoid getting drenched.
Chiang Mai and Northern Thailand: Although September falls in its rainy season, northern Thailand experiences less rainfall this month than the southern and central regions. Chiang Mai and Chaing Rai in the north experience average temperatures of about 27°C (82°F) in September.
Southern Islands of Thailand: In September, the southern islands experience varying weather conditions. The islands on the west coast (Phuket, Krabi, Khao Lak) encounter heavy downpours, but those on the east coast (Koh Samui etc.) are sunnier and brighter with only moderate rainfall.
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Sharon the advisor that helped me was so thorough & informative and explained the details of the tour including questions about visas and what is included vs what is not included in the tour packages. I would recommend them to explain tour packages that would fit the schedule of your pending travels.More
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Alana Mitchell, Sep 2023
Family Trip to Thailand-Cambodia
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José Antonio Carrillo de la Pl, Sep 2023
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I was planning a trip to Thailand to…
I was planning a trip to Thailand to especially see the Lantern Festival this year for our birthdays!! It’s been on our bucket list, but we were completely lost on how to go about planning for our trip. We’ve never really booked tours before but Alisa was extremely helpful, knowledgeable, flexible and efficient in providing all the information we needed to make our decision on the best tours and tickets to purchase. Thank you so much!!More
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All of our guides were wonderful (Mr. Bank - Bangkok and Ms. Kai in Phuket & Khao Sok plus antoher guide who assisted in Koh Samui). Sharon took care of tours, private drivers, flights and hotels within Thailand and our trip went off without a hitch. The hotels were great and the transportation always arrived on time and with a clean,More
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Alisa with Asia Highlights has has been great to work with. Very friendly and responsive.More
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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 ThailandMore
Tracy, Aug 2023
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
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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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Chris Williams, Jul 2023
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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The Best Places to Visit in Thailand in September
September is a good time to visit some (eastern) islands. Here we have selected the five best places to visit in Thailand in September so that you can plan a more pleasantly-memorable and hassle-free vacation.
1. Koh Samui
Different from other places in Thailand, the high season to visit Koh Samui is from January to September. Sudden rainfall may occur now and then, but these showers are most likely to occur in the evenings. After dinner, you can take a walk on the beach, appreciate the sunset, and let the cool and fresh breeze blow your cares away.
September is also the perfect time for scuba diving and snorkeling around Koh Samui. There are several lovely, small islands for diving, such as Koh Tao. Alternatively, you can kayak to Ang Thong Marine Park, which boasts 42 islands with pristine white sandy beaches and sheer limestone cliffs.
Suggested read: Best (and Worst) Times to Visit Koh Samui
2. Chiang Mai
The weather in Chiang Mai is mostly sunny in the morning in September. And in the afternoon the rain creates a deep sense of peace and tranquility to this quiet city.
You can take a volunteer program in an elephant sanctuary, or take a Thai cooking class with a local chef, even if it rains, and then get a traditional Thai massage after a full day's activity.
3. Khao Yai National Park
September is the best time to observe the wildlife and admire the waterfalls in Khao Yai National Park, which is one of the most popular national parks, located in northern Thailand. The rain in September allows the forests to be at their lushest, the waterfalls at their fullest, as well as the elephants are at their most active.
Do not miss Haew Suwat Waterfall, which is renowned as the shooting location for Leonardo DiCaprio's waterfall dive in the movie The Beach.
September is the best time to see thundering waterfalls as the rivers are then swollen with rain.
Located in Kanchanaburi, Erawan Falls is one of the most splendid waterfalls in Thailand and is the biggest draw in Erawan National Park. During the rainy season, mighty waters rush down into the green pond, which makes for a spectacular sight.
Being the capital city and a cosmopolis, Bangkok offers a variety of activities to keep you enthralled in September. The city has many cultural centers, museums, and shopping malls where you can spend a whole day, despite the rain.
Suggested read: How to Plan Your First Trip to Thailand — 7 Easy Steps.
Crowding and Costs in September
September is the wettest month in Thailand, so major tourist attractions and beaches are less crowded. Hotel rates are much cheaper than at the height of the tourist season. Activities rates are also discounted in this month including diving, surfing, snorkeling, and so on.
The exception is the east peninsula coast (the Koh Samui area), which still enjoys only moderate rainfall and relatively high visitor numbers before its torrential rains come in October/November.
Clothes to Wear in September
September is still hot in most parts of Thailand. Light and cool clothes are recommended: shorts, skirts, T-shirts, light trousers, and caps are common wear in September. Remember to bring a raincoat/umbrella and comfortable-when-wet or quick-drying shoes (e.g. Crocs/sandals: wellies would probably be overkill) as it often rains in September.
In the northern cities, like Chiang Mai and Chiang Rai, the temperature can be lower than in the central/southern cities. So, bring some long-sleeved clothes, and long skirts or light trousers to wear when it turns cool in the evenings.
Monthly Weather and Travel Information for Thailand
Learn about the weather in Thailand for 12 months and find out the best places to visit each month.
|Thailand in January||Thailand in February||Thailand in March|
|Thailand in April||Thailand in May||Thailand in June|
|Thailand in July||Thailand in August||Thailand in September|
|Thailand in October||Thailand in November||Thailand in December|
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