Thailand in September: Weather & Where to Visit

Thailand in September: Weather & Where to Visit

By Chris QuanUpdated Oct. 19, 2021

September is the wettest month in Thailand’s southwest (Phuket etc.), with an average rainfall of about 220 mm (9 in) across the country’s popular travel destinations.

Heavy downpours are expected in the afternoon and evening. The weather remains hot however, with an average temperature of 28°C (82°F).

If you want to do more than just hang out at the beach all day, September is an excellent time to visit, as there are plenty of indoor activities to explore in Thailand.

Here we have selected the five best places to visit in Thailand in September so that you can plan a memorable and hassle-free vacation.

Thailand Maeklong Railway Market Thailand Maeklong Railway Market

September Climate Averages for Popular Cities in Thailand

Location Min. Temp. (ºC) Max. Temp. (ºC)  Rainfall (mm) Min. Temp. (ºF) Max. Temp. (ºF)  Rainfall (in)
Bangkok 25 32 220 77 90 9
Chiang Mai 23 32 190 73 90 7
Phuket 24 30 400 75 86 16
Krabi 25 32 281 77 90 11
Hua Hin 25 33 100 77 91 4
Koh Samui 25 31 130 77 88 5

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 bursts of one to two hours. When planning your tour, you could schedule outdoor sight-seeing for the morning, to avoid getting drenched.

Northern Thailand

Although September falls in the rainy season, northern Thailand experiences comparatively lesser 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. There are many national parks and waterfalls in northern Thailand.

While the waterfalls will be particularly full as the rivers will be swollen by rain, the surrounding jungles will be very lush and green as well. The sharp bursts of rain lend freshness to the otherwise humid air.

There are many national parks and waterfalls in northern Thailand. While the waterfalls will be particularly full as the rivers will be swollen by rain, the surrounding jungles will be very lush and green as well. The sharp bursts of rain lend freshness to the otherwise humid air.

Southern Islands

In September, the southern islands experience varying weather conditions. The islands on the west coast encounter heavy downpours, but those on the east coast are sunny and bright.

Phuket experiences heavy rainfall in September, while on the opposite coast, Koh Samui experiences relatively pleasant weather.

Although the quantity of rainfall received varies across the southern islands, temperatures remain fairly similar, at an average of 28°C (82°F).

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Why Visit Thailand in September?

Touring Thailand during the rainy season is much more affordable than visiting during the high season. You can get good discounts on flight tickets and hotels.

Moreover, because it is not monsoon season in Koh Samui in September, it is a great place to visit during this month. The low pricing and quiet atmosphere make for a relaxing beach holiday.

5 Best Places to Visit in Thailand in September

We have selected the five must-see places in Thailand if you’re visiting in September. Read on to plan your ideal vacation filled with unforgettable memories.

1. Koh Samui

Koh Samui Koh Samui

November to February is the best time to visit Thailand. However, this does not exactly apply to Koh Samui, whose peak season is January to September. The average temperature in Koh Samui in September is about 28°C (82°F).

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. There are several lovely, small islands for diving near Koh Samui, 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.

2. Bangkok

Wat Phra Kaew In Daylight Wat Phra Kaew In Daylight

Being the capital city and a cosmopolis, Bangkok offers a variety of activities to keep you enthralled in September. The weather is generally rainy or cloudy, but the cloud cover slightly declines toward the end of the month.

The city has many cultural centers and museums. Bangkok Art and Culture Center (BACC) is a hub for various kinds of art, music, drama, film, design, cultural and educational activities, exhibitions, and performances.

Madame Tussaud’s, the first in Southeast Asia; Siam Ocean World, the largest aquarium in Southeast Asia; and Art in Paradise 3D Museum are all especially suitable for some indoor family fun.

Central Bangkok, the heart of fashion and entertainment in Thailand, is a major attraction for young people and shopaholics. There you will find luxury shopping malls, restaurants, hotels, and spas. The most popular malls include CentralWorld, ZEN, Central Embassy, and Central Chidlom.

Further, on a clear day, you can visit the Grand Palace, Wat Phra Kaew, Wat Arun, Wat Pho, and China Town.

3. Kanchanaburi

Erawan Falls in Kanchanaburi Erawan Falls in Kanchanaburi

September is the best time to see thundering waterfalls as the rivers would be 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.

Erawan Falls has seven major tiers and a few smaller tiers, all of which are easily accessible via a series of trails and footbridges up to the sixth tier. The total distance from the trailhead up to the top is nearly 1.5 km (0.9 mi).

During the rainy season, mighty waters rush down into the green pond, which makes for a spectacular sight. The Death Railway (Burma–Siam Railway) in Kanchanaburi is also worth visiting.

4. Khao Yai National Park

September is the best time to observe the wildlife and admire the waterfalls in Khao Yai National Park. This is one of the most popular national parks located in northern Thailand.

The forests are at their lushest, the waterfalls are at their fullest, and 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 2000 movie The Beach.

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5. Chiang Mai

Doi Suthep Doi Suthep

Surrounded by mountains and with a river running through it, Chiang Mai’s peaceful and green environment is delightful. Rain lends a deep sense of peace and tranquility to this quiet city.

The weather in Chiang Mai is mostly sunny in September. You can visit Doi Suthep for its stunning natural beauty and the famous Wat Phra That Doi Suthep, stroll through Nimmanhaemin Road to explore the latest local fashion styles, participate in a Thai cooking class, and unwind with a traditional Thai massage.

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