Thailand Rainy Season: When It Is? How Bad?
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Thailand Rainy Season: When It Is? How Bad?

Written by Cindy Updated Jan. 6, 2025

When is the Rainy Season in Thailand?

Thailand's tropical climate is influenced by two monsoons (the southwest and the northeast monsoon). In most of Thailand, the rainy season lasts from May to October. For the south's east coast (including Koh Samui), this would extend into December.

While the monsoon brings more frequent rains, it rarely means non-stop downpours. During the monsoon, the heaviest rainfall gradually shifts from north to south.

  • Northern Thailand (like Chiang Mai): peaks in August and September
  • Central Thailand (like Bangkok) and the western islands (like Phuket): peaks in September and October
  • Rainy season on the eastern islands(like Koh Samui): heaviest in October and November
Rainfall Peaks Across Thailand

How Often Does It Rain During Thailand's Rainy Season?

Mention "rainy season" or "monsoon season" and most people imagine endless downpours. In Thailand, it usually means "raining more often" instead of constant rain. Early in the season, at least half the days are dry. When it rains, it lasts about one or two hours, usually in the afternoon or evening.

As the season peaks, rainfall becomes heavier and more frequent. All-day rain is rare unless caused by typhoons or storms. With good planning and a flexible schedule, travel during the rainy season is still possible.

If you're seeking the best weather, read about Best Times to Visit Thailand.

Is It Worth Visiting Thailand in the Rainy Season?

It is a mix of options. The best deals and the most tranquil vibe are definitely bonuses worth risking the rain for.

But the experiences vary slightly:

  • Historical and cultural destinations: The rainy season is arguably the best time to visit Thailand's temples, palaces, and historical landmarks, particularly in Bangkok, Ayutthaya, and Chiang Mai. These sites are less affected by rain, and fewer tourists mean a more relaxed experience.
  • Beach vacations: Surprisingly, the rainy season could work for a beach getaway if you choose the right location. Eastern islands, such as Koh Samui, are drier between May and September, while western islands, such as Phuket, are better between October and December.
  • Jungle adventures: Trekking and jungle activities are somewhat limited in popular national parks, like Khao Yai and Khao Sok. You would need to account for muddy trails, leeches, and slippery paths after rain. Some trails and caves might even be closed for safety.

For all activities, a backup plan is necessary when traveling in the wet months.

Must read: How to Plan Your First Trip to Thailand — 7 Easy Steps.

What is the Rainy Season Like in Thailand? 

Although the rainy season hits Thailand mainly from May to October, it varies a little bit in different regions. Understanding the weather patterns of each area would help you plan a memorable trip, even during the wet season.

Thailand Weather

Wet Season in Northern Thailand

  • Chiang Mai, Chiang Rai, Pai, Mae Hong Son, Lampang, Sukhothai

The monsoon in northern Thailand starts in May, with lighter rain in June and July. Heavy downpours peak from late July to September and ease by late October. For less rain, plan your visit in early May, June, July, or October.

Rainfall would cool the heat. Early in the season, temperatures often exceed 35°C (95°F) and could hit 40°C (104°F). By July, rain moderates the heat, with daytime highs of about 32°C (90°F) and cooler nights.

Thanks to its mountainous terrain, northern Thailand experiences less rain than other regions, making it a drier escape during the wet season. Additionally, the region's vibrant hill tribe culture and striking Lanna temples would never disappoint you, regardless of the weather.

Average Monthly Rainfall in Northern Thai Cities

Rainy Season in Central Thailand

  • Central Thailand: Bangkok, Ayutthaya, Lopburi, Khao Yai National Park, Kanchanaburi, Pattaya

You could expect the rains in central Thailand to increase slightly from May to August, peaking in September and October. It shares the same rainy season as the western islands, but it is much drier. For example, in September (the rainiest month), Bangkok gets about 221 mm / 8.7 in of rain, whereas Phuket experiences up to 318 mm / 12.5 in.

With less rainfall, central Thailand remains a viable travel destination during the rainy season. Explore Bangkok's temples, Kanchanaburi's war sites and floating bungalows, or the lush landscapes of Khao Yai.

Average-Monthly-Rainfall-in-Central-Thai-Cities

Rainy Season in the Western Islands

  • Phuket, Krabi, Similan Islands, Phang Nga, Koh Lanta, Koh Yao Yai, Koh Yao Noi

Rainfall patterns are similar to those in Central Thai cities, with the heaviest rainfall in September and October. However, they receive more rain than inland cities.

Although activities on the western islands are sensitive to weather, it wouldn't ruin your beach vacation if you're flexible. Heavy rains and storms, common in September and October, may limit island hopping, snorkeling, or surfing. For the rest of the season, sunny days are still possible. The Similan Islands, however, stay closed throughout the rainy season.

Average Monthly Rainfall in Western Islands

Monsoon in Eastern Islands

  • Koh Samui, Koh Tao, Koh Pha Ngan

Unlike other parts of Thailand, the islands near the Gulf have their own rhythm. You could expect occasional showers averaging 10 days from May to September. The precipitation is just half of that in Phuket, so they become a great beach alternative during this period.

When the western islands' wet season withdraws from October, the eastern side sees the heaviest downpours. The wettest month is November with rainfall of 445 mm / 17.5 in accompanying strong winds.

Average Monthly Rainfall in Eastern Islands

6 Best Places to Visit in Thailand during the Rainy Season

Below is our list of spectacular monsoon destinations in Thailand. These are the places where you can enjoy vacations for relaxing, sightseeing, and adventure accompanied by some raindrops.

  • Central Thailand: Bangkok and Kanchanaburi
  • Northern Thailand: Chiang Mai
  • Southern Thailand: Koh Samui, Phuket, and Koh Sok

1. Bangkok: Epitome of Thailand

In Bangkok, it rains almost every day during the rainy season, but it rarely rains all day. This means that many activities can be planned around the weather. Rain or shine, famous attractions such as the Grand Palace and Wat Arun can be visited. Besides, you can get a spa treatment, get lost in a museum such as the National Museum, go shopping, and take a cooking class.

Suggested reading: Best 3 Thailand Itineraries for 12 Days

2. Kanchanaburi: Relaxing Getaway near Bangkok

The Ride on the historic railway, KanchanaburiThe train ride on the Death Railway, Kanchanaburi

During the rainy season, Kanchanaburi experiences less rainfall than other central cities.

A train ride along the Death Railway offers a leisurely escape on a rainy day. Without large crowds, the popular sites, such as the Bridge on the River Kwai and the Hellfire Pass Memorial Museum, offer a more peaceful and relaxed atmosphere.

Iconic waterfalls, such as the seven-tiered Erawan Falls, are at their most spectacular. Staying in a floating house offers an immersive escape into nature. The FloatHouse River Kwai is one of the best choices.

3. Chiang Mai: Serene Lanna Temples Exploration and Elephant Interaction

chiang mai

Chiang Mai is one of the best destinations to visit during the rainy season. Due to its high latitude, it is cooler and drier than Bangkok. You will experience the downpours, but they usually occur for only a few hours in the late afternoon and early evening.

Chiang Mai's iconic Lanna temples never loose their charm, even on a rainy day. Step inside exquisite temples, chat with monks, or try a meditation session. And don't miss a visit to the Elephant Sanctuary—interacting with elephants at a most peaceful vibe. The rain also brings the region to life, with rice fields and mountains glowing in lush greenery.

4. Koh Samui: A Drier Beach Destination from May to September

koh samui

Koh Samui's climate is different from Phuket and other western parts of Thailand's peninsula. It is one of the driest destinations among all the tourist areas during the west coast rainy season (May–September), making it a good beach alternative.

The nearby islands of Koh Phangan and Koh Tao are also great places to go during the May–September period. Koh Phangan is famous for being the home of the hedonistic Full Moon Party. Koh Tao is best known for its diving and snorkeling sites. See the best time to visit Koh Samui.

5. Khao Sok: Hidden Natural Escape in Southern Thailand

Treking in Khao SokTreking in Khao Sok

Known as the hidden gem of Thailand, the rainy season makes it more exclusive. There are no long lines and no crowded viewpoints — just pure tranquility.

As an outdoor paradise, while some trekking trails might close temporarily on rainy days, other activities remain as captivating as ever. Boat tours, swimming, and canoeing remain fantastic options to enjoy Cheow Lan Lake. Observing elephants at a close distance is a great way to escape the rain. Don't miss the special accommodations, such as floating bungalows, tree houses, and tented camps.

6. Phuket: Budget-Friendly Beach Vacation

Phuket is still a good option from May to August, the less rainy months. While there's some rain, it rarely lasts all day, leaving you with plenty of dry hours for the beach or outdoor activities. Accommodation discounts of up to half price also make it an attractive choice.

However, it's best to plan for flexible days in case of continuous rainfall. Island-hopping tours might be canceled during strong winds, so a bit of adaptability would go a long way.

It should be noted that Phuket's rainy season is much wetter than for destinations further north in Thailand, though it covers the same months. If you prefer to a drier beach vacation, go to Koh Samui. For a guaranteed sunny day, you can consider other island destinations, such as Bali.

Travel Tips for the Rainy Seasons in Thailand

Here are a few additional tips that will help you navigate Thailand's rainy seasons more comfortably.

  • Stay Flexible: Keep a few extra days in your schedule to adapt to unexpected delays caused by the weather.
  • Pack Smart for Wet Weather: Bring waterproof gear, quick-drying clothes, and non-slip shoes to stay dry and comfortable.
  • Get the Right Insurance: Ensure your travel insurance covers weather-related delays for a stress-free trip.

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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.

Visit Thailand with Asia Highlights

Interpreting how Thailand's rainy season will impact your travels can be difficult and time-consuming. Our experts can help by tailor-making your trip to be amazing even with a little rain.

At Asia Highlights we have lots of experience planning trips in Thailand during both, the high and the low seasons, and we know all the tips and tricks to make your journey unforgettable.

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