Best Time to Visit Thailand: Weather, Climate & Rainy Season Guide

When Is Thailand's Best Time to Visit?

When the best time to visit Thailand is can’t be summed up in a single sentence. Many people say that the so-called cool season from November to February is a good time for a trip to Thailand. That’s also peak season.

In Thailand, though, it’s a bit more complicated. The best time to visit varies by region. Only in January and February do you typically have truly great weather across the entire country.

In a table below, we’ll give you a quick first overview of the best times to visit for the four most important travel regions in Thailand.

Further down in the article, we’ll explain the travel seasons for each region in detail.

At the same time as asking what the best time to visit Thailand is, you should also ask yourself what you want to do in Thailand — and especially where.

Because even the low season, from May to October, can be a great time for your trip to Thailand. Depending on what your priorities are.

Climate in Thailand

The climate in Thailand is predominantly tropical, and in the south also tropical-monsoonal. Humidity is high and it’s usually very warm, with average annual temperatures between 26 and 30 degrees Celsius.

Broadly speaking, Thailand’s climate can be divided into three seasons.

#1 The hot season from March to May: During these months, temperatures in Thailand can climb up to 35°C. Humidity is especially high and makes the weather feel very oppressive.

#2 The rainy season from May to October: This is when it rains the most, particularly in August and September. However, it’s often just one to two hour showers per day or overnight.

#3 The cool season from November to February: During these months, temperatures in Thailand sit at a pleasant 25 to 30 degrees. Especially in the north and around Bangkok, humidity is noticeably lower.

You can use these seasons as a general guide, but you should definitely know that there are regional differences and that the climate breaks down well into four regions.

• North: The area around Chiang Mai
• Central Thailand: The area around Bangkok
• Southwest: The islands around Phuket and Khao Lak
• Southeast: The islands around Koh Samui

The north and central parts of Thailand experience the seasons described above in a fairly classic way. In the north, though, it’s still somewhat cooler on average than around Bangkok — thanks to the mountains.

The south is less defined by the seasons; instead, it has stronger monsoon periods. But here, too, there are regional differences.

The west coast on the Andaman Sea is more affected during the rainy season between May and October than the east coast.

On the east coast in the Gulf of Thailand, the rainy season is longer. Between October and early January sees the most rain — but in the months before that, far less than on the west coast.

For orientation, we’ve marked the four regions on a map.

What exactly the weather is like in each region, and when the best time to go to Thailand — whether that’s Bangkok, northern Thailand, or the islands — we’ll now explain in detail.

Best Time to Visit Chiang Mai and Northern Thailand

The months from November to early February are considered the best time to visit Chiang Mai, Chiang Rai, and northern Thailand.

During this time, the sun shines almost all day, it barely rains, and temperatures hover around 25 to 30 degrees. At night, though, it can drop to as low as 15 degrees.

You’ll have good weather from mid-February to April as well, but that period is actually the worst time to visit northern Thailand. The reason is the so-called Burning Season.

During this time, Chiang Mai (and northern Laos, for that matter) is so severely affected by smog and air pollution that you sometimes can’t see the surrounding mountains at all.

The causes of the air pollution are varied — a combination of traffic, farmers burning their fields, and the dry season, during which air circulates less.

Not just tourists, but many locals also completely avoid popular spots in the north during these months, such as Chiang Mai, Pai, or the White Temple in Chiang Rai (the top highlight in Chiang Rai).

Thailand Climate Chart for Chiang Mai

The climate chart for Chiang Mai gives you a great overview of average monthly temperatures and rainfall.

Note that the Burning Season in Chiang Mai is not reflected in this climate chart.

Best Time to Visit Bangkok and Central Thailand

The best time to visit Bangkok (and Ayutthaya) is from November to April. During this time, you really don’t have to worry much about bad weather in the capital.

You’ll typically enjoy pleasant temperatures around 25°C, sometimes a bit warmer, the sun shines often, and it barely rains. It’s not until April that rain picks up, but it’s at most just a few brief showers.

If a few showers, slightly higher humidity, and an overcast sky don’t bother you, we can tell you that Bangkok is a great destination year-round.

Even in the summer months it’s pleasantly warm and in our opinion not extreme heat either. Actually quite nice for checking out the most beautiful sights in Bangkok or taking a cool tour in Bangkok.

Thailand Climate Chart for Bangkok

The climate chart for Bangkok breaks down the weather and temperatures month by month.

Best Time to Visit Phuket in Southwest Thailand

The best time to visit Phuket, the islands in southwest Thailand (such as Koh Phi Phi and Koh Lanta), and the area around Khao Lak and Khao Sok National Park is from December to April.

During these months, you’ll have the best weather in Thailand. The sun shines almost constantly, rain is rare, and temperatures range from a very pleasant 26 to 34 degrees. Only in December and April might there be a bit more rain.

Personally, that doesn’t bother us. During those hours we like to do something fun, like a cooking class — one of the great activities in Khao Lak.

If your focus in this region is on beach, sun, and swimming, though, you should avoid the rainy season from May to October. Rain is frequent then — sometimes all day long.

The most beautiful beaches in Khao Lak and on the islands are often covered by a gray sky, and the water is quite choppy and rough.

Read more about the best time to visit Khao Lak

Thailand Climate Chart for Phuket

We’ve put together a climate chart for Phuket to give you a great overview of the weather on the Andaman Sea in southwest Thailand.

Best Time to Visit Koh Samui in Southeast Thailand

The best time to visit Koh Samui, Koh Phangan, and Koh Tao is split across two periods: from mid-January to April and from July to September.

During the first period, as in the rest of the country, you’ll have the best weather in Thailand. It’s sunny, rain is minimal, and temperatures in the Gulf of Thailand range between 23 and 30 degrees.

The second period is a bit different. Although it’s the rainy season, it actually doesn’t rain all that much here from July to September. It’s still pleasantly warm — the sun just doesn’t show up quite as often.

You should avoid the months of October through early January, however. During this time, it can rain quite heavily on Koh Samui. In recent years, there have even been more frequent floods.

Thailand Climate Chart for Koh Samui

We’ve laid out the weather and temperatures in the Gulf of Thailand for every month in a climate chart for the Thai island of Koh Samui.

Best Time to Visit by Activity

Classic sightseeing, zipping around on a scooter, taking a cooking class, or going on a boat tour are always possible in Thailand. Same goes for our best activities in Bangkok and the nine coolest city tours in Bangkok.

Popular water activities, however, depend heavily on the weather. Not everything is ideal at every time of year. Here’s exactly when you can do what.

Best Time for a Thailand Road Trip

The best time for a road trip through Thailand varies greatly depending on what activities you want to do and which regions you want to travel to.

If you want the best weather in every region — meaning the north, central Thailand, the south, and all the islands in Thailand — you should fly to Thailand in January or February.

During these months, however, it’s also peak season in Thailand. Every island and every town is packed with people, and most accommodations raise their prices.

If you’re planning a road trip, be sure to check out our Thailand road trip article. There we give you various route suggestions for two, three, and four weeks.

We recommend cross-referencing the individual routes with the climate charts above. As a decision-making aid, we’ve already noted the best travel season and the highlights for each route.

By the way, we’re big fans of the low season in Thailand. The sky is often overcast, but it’s always warm.

On top of that, many accommodations are cheaper during those months, lots of things can be booked last minute, and there are significantly fewer tourists around. You do have to be able to live with the rain showers, though.

Best Time to Dive and Snorkel in Thailand

The best time to dive and snorkel varies by region. The most popular spots in Thailand are found around the islands of Koh Tao and Koh Phangan in the Gulf of Thailand.

The best time to dive and snorkel in the Gulf of Thailand is from February to September. During this time, the sea is calm and visibility is good.

Koh Phangan is our favorite island in this area. We recommend the best snorkeling spots and a great dive course in our article on the 13 best excursions and activities on Koh Phangan.

You should avoid the months of October through December — it rains frequently and there’s often heavy swell.

The best time to dive and snorkel in the Andaman Sea is from November to April. During this time, the water is clear and calm.

In the southwest, avoid the months of May through October. That’s when it rains the most and underwater visibility drops significantly.

Best Time to Swim in Thailand

The best time for swimming is similar to diving. In the Gulf of Thailand, the best swimming is from February to September, when the sea is at its calmest.

From October to December you should be cautious, as heavy rain typically makes the sea rough and choppy.

On the Andaman Sea, conditions are best from November to April. The sunny, warm weather and calm seas are ideal for swimming.

From May to October it’s the rainy season and the sea is often rough.

Best Time to Surf in Thailand

The most popular surf spots in Thailand are on Phuket and in Khao Lak on the Andaman Sea. Unlike diving and swimming, the rainy season is actually ideal for surfing here.

From June to October, the monsoon season brings large, consistent waves and thus perfect conditions for surfing.

When Is Thailand's Cheapest Time to Visit?

Thailand’s cheapest time to visit is during the low season from May to October. If you’re lucky, you can score some great flight deals during this period.

Check flights on Skyscanner

But more importantly, accommodation prices in Thailand drop during the low season. Depending on the region, you can get some of the nicest hotels for really little money.

Our best deal was in June at a hotel in Khao Lak. We stayed at the Outrigger Resort for 40 euros a night — in peak season, that same room goes for around 300 euros.

And for our accommodation on Koh Phangan — right on the beach — we paid only a third of the regular price. We stayed in a bungalow at Colorful Hut.

But whether it’s hotels in Bangkok or the lovely accommodations in Chiang Mai’s old town, you’ll definitely pay less during the low season.

Prices for food, transportation, and massages stay the same year-round. But for activities or tours, you could save money there too.

What Is Thailand Like During Rainy Season? Our Experience

The rainy season runs from May to October. The frequency of rainfall, however, also varies by region and month.

In northern and central Thailand, it rains the most in August and September. In the south, the rainy season is more intense and again splits into the southwest and southeast.

In the southwest on the Andaman Sea, you really do have to expect heavy showers or longer rainy days repeatedly from May to October.

The southeast has a longer rainy season, with the most rain falling in November and December. In return, the weather from July to September is pretty good and it barely rains.

In general, though, you should know that in every region, despite the rainy season, there are many dry spells, and it’s often the case that it only rains one to two hours per day — though when it does, it pours.

Our Experience with Thailand During Rainy Season

As we mentioned, we’re big fans of Thailand in the low season — meaning the rainy season. Because most of the time we’ve genuinely been very lucky with the weather.

Our worst experiences have been in the southwest. There we had days when it rained all day, or at least half the day.

A chill beach day or cruising around the islands on a scooter is genuinely not fun in that case! Planning boat tours is also more difficult then.

For example, we arrived on Koh Phi Phi in pouring rain and booked a speedboat for the next day just to be safe, since they run even in the rain.

The next day, though — despite it being rainy season in Thailand — we were incredibly lucky and were greeted by a brilliant blue sky.

In Khao Sok National Park, it also started raining around midday. The boat tour was still doable, but in the end we only had photos in the rain.

If you want more certainty about the weather in southwest Thailand, we recommend avoiding the months of May to October.

It’s a different story in the southeast — there you can travel really well between July and September and often enjoy good weather.

From experience, we can tell you that it’s often overcast and we’ve had days with brief showers around midday or in the evening.

We haven’t been to the Gulf of Thailand ourselves in November or December, but we’ve heard that it sometimes rains for days on end there during those months.

We’ve also been to northern and central Thailand during rainy season. There the sky was mostly overcast and humidity was fairly high.

In Chiang Mai and Bangkok, neither of those things bothered us. On our boat tour in Bangkok, it was only slightly overcast. Sometimes it rained hard for one to two hours around midday, but mostly just at night.

We used the dry spells for sightseeing. Whenever it started raining, we went out to eat or treated ourselves to a massage.

Holidays and Public Holidays in Thailand

There are a few public holidays in Thailand that you should keep in mind for your planning. During these times, there are often a lot of people — especially locals — in the popular spots, and accommodations are often booked up well in advance.

On the other hand, it’s a unique and cultural experience to be part of Thai parades and ceremonies. There are fascinating festivals in Bangkok throughout the entire year.

The most important public holidays in Thailand include:

• January/February (date varies): Chinese New Year
• February (dates vary): Flower Festival in Chiang Mai
• February/March (date varies): Makha Bucha (ceremonies at temples)
• April 13–15: Thai New Year (sometimes goes longer)
• May (date varies): Visakha Bucha (commemorates Buddha’s birth)
• June 3: Queen’s Birthday (national holiday with parades)
• July 28: King’s Birthday (national holiday with parades)
• November (date varies): Loy Krathong Festival of Lights
• December 5: Former King’s Birthday (national holiday)

The longest school vacation in Thailand is the summer break of two months. It usually falls between early March and mid-May. In October, there’s also a fall break of two to three weeks.

Natural Disasters in Thailand

Due to the sometimes heavy rainfall in Thailand during the rainy season, from May to October, floods and landslides occur frequently throughout the country. People have even lost their lives as a result.

The southeast, including Koh Samui, is also affected by heavy rain and occasional tropical storms from November through January.

In addition, Thailand is located in a seismically active zone, which means earthquakes and seaquakes are always a possibility. Be sure to pay attention to local warnings.

You can also stay informed about weather warnings through the Thai Meteorological Department.

Frequently Asked Questions