This guide turns the question around. Instead of one "best time", you get the region that fits your month: Bangkok and the centre, Chiang Mai and the north, the Andaman coast around Krabi and Phuket, and the Gulf islands around Koh Samui. Then two routes, one for winter and one for summer, ready to plan.
Plan Thailand in Stippl
Day-by-day planning, stays and budget in one app, with every place from this guide already on the map.
Download the appWhen is the best time to visit Thailand? The short answer
November to February is the safest choice for a first route that combines Bangkok, the north and the beaches. The rain has cleared, the air is at its freshest, mornings in the mountains are cool and the sea on the Andaman side is calm and clear.
That window comes with a catch: it is also the busiest and most expensive time of year. The weeks around Christmas and New Year are the peak of the peak, when island rooms sell out months ahead and rates can double.
Outside that window, you don't cancel Thailand, you switch coasts. From roughly May to October the Andaman coast (Phuket, Krabi, Koh Lipe) takes the southwest monsoon, while the Gulf islands (Koh Samui, Koh Phangan, Koh Tao) stay the better beach choice. From October to December it flips: the Gulf gets its heaviest rain just as the Andaman coast clears.
So the honest answer is two questions. When can you travel? And which region do you want most?
Thailand's three seasons
Thailand runs on three seasons, and they decide far more about your trip than the date on your ticket.
The cool season, roughly November to February. Dry, comfortable and clear, from the temples of Bangkok to the hill towns of the north. Nights up north are genuinely chilly in December and January, so a fleece earns its place in your bag. This is high season everywhere, so book islands and Chiang Mai ahead.
The hot season, roughly March to May. April is the hottest month of the year. It is a good time for the beaches, where a sea breeze helps, and a hard one for long temple days in the cities. It is also Songkran, the Thai New Year water fight from 13 to 15 April, which in practice runs for most of a week in Chiang Mai and Bangkok.
The rainy season, roughly June to October. The rain usually comes as a short, heavy downpour in the afternoon rather than all day, with August to October the wettest stretch. In exchange you get green rice fields, full waterfalls, the lowest room prices and the thinnest crowds of the year.
One region ignores this calendar: the Gulf islands. They sit in the rain shadow while the southwest monsoon soaks the west coast, and take their own wet season from October to December. Keep that in mind as you read on.
The best time for each region
In Thailand, the region matters more than the month. Each section below gives you the good months, the months to avoid and one tip that changes how you plan.
Best time to visit Thailand: Bangkok and the centre
The best time to visit Bangkok is November to February, when the humidity drops and walking between temples is a pleasure rather than a test. Late November and early December are the sweet spot: the rain has gone and the Christmas crowds have not yet arrived.
March to May is hot and sticky, and March and April also bring haze from crop burning. The rains build from May or June, and September is Bangkok's wettest month, when streets can flood.
Here is the good news: Bangkok works all year, and almost every trip starts or ends there anyway. In the hottest weeks, let the heat set the rhythm of the day: temples and markets early, something indoors at midday, rooftops at sunset and Chinatown after dark. A Thai cooking class is a good midday plan and costs about €15 to €60 (580 to 2,300 ฿); you can compare Bangkok cooking classes on GetYourGuide.
Chiang Mai, Pai and the north
The north is at its best from November to January. Days are warm, the air is clean, and the mornings in the mountains are properly cold. In Pai, December and January mornings are cold enough for a jacket, and most budget bungalows have no heating, so pack a warm layer.
Then comes the one thing every northern trip has to plan around: the burning season. Crop and forest fires across the north and neighbouring countries fill the valleys with smoke from February to mid-April, with March the worst month. The famous viewpoints, from Doi Suthep above Chiang Mai to the canyon at Pai, are simply gone in the haze. Pai's bowl-shaped valley traps the smoke, so it is usually worse there than in Chiang Mai.
The rains clear the air fast, usually from late April into May. From May to October the north turns green, the waterfalls run strong and rooms are at their cheapest; trails get muddy, but it is a lovely time for a slower trip. In November, Loy Krathong and Yi Peng fill Chiang Mai with floating candles and sky lanterns, so book your room early if your dates overlap. Heading to Pai in the north? November to January is the honest window.
The Andaman coast: Phuket, Krabi and Koh Lipe
The west coast is a winter destination. From November to April, and most reliably from December to March, the sea is calm and clear, every boat runs and the limestone islands look exactly like the postcards.
That also answers the best time to visit Thailand for Krabi: come between November and April, because on the Krabi coast the trip is the boat trips. A rainy afternoon is a small thing. A cancelled boat day to Railay, the Hong islands or Koh Phi Phi is the trip. Plan Krabi for the dry months and you get the island hopping you came for.
From roughly May to October the southwest monsoon sends wind and swell straight onto this coast. The rain comes in bursts, but the sea is the real problem: crossings thin out, small boats cancel and red flags go up on the west-facing beaches. Koh Lipe in the far south is the most affected, with some resorts closing and ferries shrinking to a minimum. Two fixed dates to know: Maya Bay on Phi Phi usually closes from 1 August to 30 September, and the Similan and Surin marine parks close for diving from mid-May to mid-October. Check the park announcement before you go, as the dates are set each year.
When to go to Phuket
Phuket follows the Andaman rhythm: December to March is the settled core, with late December to February the busiest and priciest weeks. The shoulder months, November and March into early May, give you good weather with fewer people. We are working on a full guide to the best time to go to Phuket, including the monsoon months when the island suits surfers more than swimmers.
The Gulf islands: Koh Samui, Koh Phangan and Koh Tao
The east coast runs the opposite way, and this is the most common Thailand planning mistake. The Gulf islands are driest from February to April, still good from May to September with short afternoon showers, and properly wet from October to December, when November is the wettest month of the year.
That makes them the beach choice for summer. While Phuket and Krabi deal with the monsoon from June to September, Koh Samui gets light, short showers and calm days in between. Can't choose between the two islands? Our Koh Samui vs Phuket comparison puts them side by side.
Divers have an extra reason to come in summer: the water around Koh Tao is at its clearest from July to September. In November small dive schools traditionally close, and Ang Thong Marine Park, the classic day trip from Samui, usually shuts from 1 November to mid-December.
Thailand month by month at a glance
No temperature tables here, just the decision. Find your travel month and see which region wins.
November to February: the classic season. Bangkok, the north and the Andaman coast are all at their best, which is why most first routes are planned for these months. The Gulf islands are the one region to avoid, especially in November and December. Watch two things: the price peak around Christmas and New Year, and the burning season that can creep into the north by late February. For a closer look at the end of the year, read our guide to Thailand in December.
March to May: hot, with the coasts in front. The Andaman coast stays good through March and April, with the best diving of the year. The Gulf islands are in their driest window. The north is the region to skip until the rains clear the smoke, and Bangkok is hot enough to plan your days around the heat. From May, the Andaman coast starts to turn.
June to October: green season. The Gulf islands win the beach question from June to September. The north and Bangkok work well with some rain in the afternoon, and both are at their cheapest. The Andaman coast is the region to avoid for beach days and boat trips, until it starts to clear in October. In October the coasts change places: the west dries out as the Gulf gets wet.
Thailand weather by month
Each month has its own mix of rain, sea and crowds, and the grid above gives you the decision in one read. A full guide to Thailand's weather by month, region by region, is on its way and will be linked here.
The best month to visit Thailand
If you want one month, it is usually late November or December, when the north and the Andaman coast are both at their best and the rain has gone. But the best month really depends on your route: an island trip to Koh Tao peaks in a different month than a trek around Chiang Mai. A dedicated guide to the single best month is coming soon.
Thailand's rainy season: should you still go?
Yes, if you choose the right region. The rainy season brings green landscapes, full waterfalls, lower prices and far fewer people, and the rain is mostly a heavy afternoon shower you can wait out over lunch. Base your beach days on the Gulf side, keep the north and Bangkok in the route, and leave the Andaman island hopping for another trip. A full guide to the Thailand rainy season, month by month and coast by coast, is on its way.
The worst time to visit Thailand
There is no worst month for the whole country, only bad months per region. Each has a better choice in the same weeks.
The Andaman coast from June to September. The peak of the southwest monsoon: rough seas, cancelled boats and red-flag beaches on Phuket, Krabi and Koh Lipe. Go to the Gulf islands instead.
The north from late February to mid-April. The burning season haze hides the views and makes the air unhealthy, worst in March. Spend those weeks on either coast; both are good in March and April.
The Gulf islands from October to December. Their real wet season, with the heaviest rain in November and ferries cancelled on rough days. Switch to the Andaman coast, which is clearing at exactly that time.
Bangkok in the hottest weeks of April. Long temple days become hard work. Keep the city short, start early, and head for the beach.
Cheapest and least crowded time to visit Thailand
The cheapest time to visit Thailand is the rainy season, roughly May to September, when rooms and flights drop to their lowest prices of the year. The difference is biggest on the Andaman coast: from mid-May, Phuket and Krabi are noticeably cheaper on both airfare and rooms, because that is exactly when the beaches are least reliable.
The best balance of price and weather sits in the shoulder months. May gives you the last of the dry weather on the Andaman side and the start of the Gulf's best stretch. November gives you fresh, green landscapes after the rain and prices that have not yet climbed for Christmas. For the best time to visit Thailand with fewer crowds, those two months are hard to beat.
The most expensive and busiest weeks are Christmas and New Year, when rooms sell out months ahead and can cost twice as much. July and August see a second, smaller spike from summer holidays. In those weeks, book islands, the night train to Chiang Mai and ferries well ahead.
Flights to Thailand
Fares follow the same calendar as the rooms: highest around Christmas and New Year, lowest in the rainy months. If you travel in the peak, book early, as flights and rooms fill up together. A guide to flights to Thailand, with when to book and which airports to use, is coming soon.
Best time for a beach holiday or a family trip
For the best time to visit Thailand for a beach holiday, pick the coast that is in season. That means the Andaman coast from November to April (Krabi, Phuket, Koh Lanta, Koh Lipe) and the Gulf islands from February to September (Koh Samui, Koh Phangan, Koh Tao). February to April is the rare stretch when both coasts are good at once, so it is the time to combine them.
For the best time to visit Thailand with family, the cool season from November to February is the easiest: comfortable days in the cities, calm water on the Andaman side and cool evenings up north. Distances help too, with short domestic flights and cheap private transfers between stops. Skip long Bangkok days in the heat of April, and plan a pool afternoon instead.
Are your school holidays fixed? Map them onto the regions. A Christmas break fits the north and the Andaman coast, but it is the most expensive fortnight of the year. A summer holiday in July or August fits the Gulf islands, with Bangkok and the north added in the green season.
Read more: things to do in Thailand
Once you know the season, the next step is the route.
Two routes depending on when you travel
Across the more than 268,000 Thailand trips planned with Stippl, a typical stop gets three nights. That is a good rhythm to build both routes on: enough time to settle in, without spending half your trip packing.
The winter route, November to April. Start with three nights in Bangkok. Take the night train or a one hour flight north to Chiang Mai for three nights, and add Pai, a three to four hour minivan ride on a road of 762 curves, if your dates fall before February. Then fly south to the Krabi coast, usually via Bangkok, where the hop to Krabi takes about an hour and a half, for three nights in Ao Nang or Railay. Finish on an Andaman island: Koh Phi Phi is a ferry of one and a half to two hours away, Koh Lanta is quieter. Our 10 day Thailand itinerary gives you a shorter version of the city and north half.
The summer route, May to September. Again three nights in Bangkok, then the north in its green season: Chiang Mai, and Pai once the smoke has cleared. Fly back via Bangkok to Koh Samui, about 1 hour 10 minutes, or take the joint night train, bus and ferry ticket. From Samui the ferry to Koh Phangan takes 30 to 45 minutes, and Koh Tao is about two hours from Samui. Three nights on each island is plenty. For a beach-only version, see our 10 day Thailand islands itinerary.
Not sure which one fits? Go back to your travel month: the season picks the coast, and the coast picks the route.
Describe your trip, get a Thailand itinerary in seconds
Everything in this guide is already in Stippl. Tell the planner how long you have and what you like: it builds the route, the days and the travel times, and you edit whatever you want.
Plan your Thailand trip around the season in Stippl
Once you have your month, put it into a trip. In the Stippl itinerary planner you add your dates and stops, see the whole route on the map, and set the number of nights per stop. The map shows straight away which coast your islands are on, so you can check them against the season.
If your dates move, swap the coast: drag Krabi and Koh Phi Phi out, drop Koh Samui and Koh Tao in, and the trip recalculates your dates. Then invite your travel friends so everyone plans in the same trip. Want the full step by step? Our Thailand trip planner guide walks you through it.
Frequently asked questions about Thailand
For most first trips, the cool, dry months from November to February are best, with good weather in Bangkok, the north and on the Andaman coast. In the summer months the Gulf islands (Koh Samui, Koh Phangan and Koh Tao) are the better beach choice.
The rainy season, roughly May to September, brings the lowest prices for rooms and flights, especially on the Andaman coast. The shoulder months around May and November combine lower prices with fairly good weather.
There is no bad month for the whole country, only bad months per region. Avoid the Andaman coast in the wettest months, the north during the burning season haze from February to mid-April, and the Gulf islands from October to December.
Seven days is enough for Bangkok and one region, such as the north or one stretch of coast that is in season. For Bangkok, the north and the beaches together, plan closer to two weeks.
Roughly May to October on the Andaman coast, and roughly May or June to October in Bangkok and the north. The Gulf islands are the exception: they are wettest from October to December instead.
Picked your month? Then you already know your coast. Plan your Thailand trip in Stippl, put your stops on the map and set your nights, and switch coasts in one move if your dates change.
