Thailand in March: Weather, Smoke Season & Where to Go

Thailand in March: Weather, Burning Season & Where to Go

Last updated 2026-07-17

Key takeaways

March marks the start of Thailand's hot season: Bangkok typically hits 34-35°C by day with only around 31 mm of rain across roughly 3 rainy days, according to climate averages, so heat, not rain, is what you plan around.

Northern Thailand (Chiang Mai, Chiang Rai, Pai, Mae Hong Son) is in the peak of burning season in March, with AQI readings regularly passing 150 and spiking beyond 200 on bad days; IQAir ranked Chiang Mai 3rd most polluted major city in the world on 4 March 2026. Most travellers should skip the north this month.

Both coasts are good in March: the Andaman side (Phuket, Krabi, Khao Lak) has calm seas and some of its clearest water of the year (Similan Islands National Park stays open until 15 May), and the Gulf islands (Koh Samui, Koh Phangan, Koh Tao) are warm, mostly dry and settled.

Crowds and prices start easing through March as European high season winds down; early March still feels like peak season in beach areas, while late March shifts toward shoulder-season availability and rates. Confirm current prices with your accommodation.

Makha Bucha, one of Thailand's most important Buddhist holidays, follows the lunar calendar and often lands in March (3 March in 2026); it is a public holiday and alcohol sales are suspended nationwide for the day.

Pack for heat and sun: light breathable clothing, high-SPF sunscreen, and a hat matter more than rain gear in March, and if you must visit the north, bring a well-fitting N95-type mask for the smoke.

Month by month: ← Thailand in February · Thailand in April →

March is the month Thailand splits in two. Down on the coasts it is arguably one of the best months of the year: dry, sunny, calm seas on both sides of the peninsula, and the peak-season crowds finally starting to thin. Up north it is the single worst month, as burning season smoke settles over Chiang Mai, Chiang Rai and Pai and stays there. This guide covers what the weather actually does region by region, what’s on, where to go, where to honestly skip, and what to pack, so you can plan a March trip that lands on the right side of that split.

For how March compares with the rest of the year, our Thailand weather by month hub has the full twelve-month picture, and the best time to visit Thailand guide covers the trade-offs by region and travel style.

What is the weather like in Thailand in March?

March is the start of Thailand’s hot season: dry almost everywhere, hot everywhere, and hazy in the north. Rain is a non-factor in most of the country, with the heat and the northern smoke being the two things that shape a March itinerary.

Region	Daytime temps	Rain	Sea conditions	Verdict
Bangkok & central	~34-35°C days, ~25°C nights	~31 mm, ~3 rain days	n/a	Hot but dry; plan around midday heat
North (Chiang Mai, Chiang Rai, Pai)	~35-38°C days, cooler mornings	Very dry	n/a	Burning season peak; AQI often 150+, skip if you can
Andaman coast (Phuket, Krabi, Khao Lak)	~26-33°C	~59 mm, ~6 rain days (Phuket), brief showers	Calm, clear, ~28°C water; some of the year’s best visibility	Excellent
Gulf coast (Koh Samui, Koh Phangan, Koh Tao)	~27-33°C	Mostly dry, occasional shower	Calm and settled; good snorkelling and diving	Excellent

Figures are long-term climate averages compiled from Selective Asia, Weather2Travel and Travelfish climate data (checked July 2026); any given year varies, so check a forecast closer to travel.

The pattern behind the table: the cool-season breeze that makes December and January so pleasant has gone by March, replaced by rising heat and humidity that builds toward April, Thailand’s hottest month. That heat is manageable on the coast, where sea breezes and swimmable water do a lot of work, and toughest inland, in Bangkok’s concrete and in the airless haze of the north.

How bad is burning season in the north in March?

Bad, and March is the peak of it. Every dry season, roughly January through April, farmers across northern Thailand and neighbouring countries burn crop stubble and forest fires spread through the hills, trapping smoke over the valleys where Chiang Mai, Chiang Rai, Pai and Mae Hong Son sit. Air quality readings above AQI 150 (unhealthy) are routine in March, with spikes well past 200 on the worst days. On the morning of 4 March 2026, IQAir reported that “Chiang Mai ranked 3rd among the most polluted major cities in the world”, and later that month the city topped the global rankings outright.

This is not a cosmetic problem. At those PM2.5 levels the smoke stings eyes and throats, aggravates asthma and heart conditions, and cancels out the main reason people go north: the views. Doi Suthep disappears behind grey haze, and mountain viewpoints look out over milk. Our dedicated burning season in northern Thailand guide covers the season in full, including how locals cope and when it ends, but the short version for trip planning is simple: do not schedule Chiang Mai, Chiang Rai or Pai in March if you can help it. If you must be there, check a live AQI app each morning, keep outdoor time short, and wear a properly fitting N95-type mask. Conditions usually begin improving later in April as the first rains arrive.

Where should you go in Thailand in March?

Head for the coasts, either coast, because March is one of the few months when both sides of the peninsula are in form at once. On the Andaman side, Phuket, Krabi, Koh Lanta, Khao Lak and Koh Lipe are in their dry season with calm seas, water around 28°C, and some of the clearest visibility of the year for divers and snorkellers; the Similan Islands National Park, which closes seasonally, stays open until 15 May, so March is comfortably inside the window for liveaboards and day trips. On the Gulf side, Koh Samui, Koh Phangan and Koh Tao finished their own rainy season back around January and sit warm, dry and settled through March, with Koh Tao’s dive sites in good shape.

Bangkok works fine in March if you pace yourself: temples and markets early, air-conditioned malls, cafés or the river through the midday furnace, rooftop bars after dark. The eastern gulf (Koh Chang, Koh Mak, Koh Kood) is also solid this month.

Where to skip, honestly: the north (covered above), and consider skipping Pai and Mae Hong Son even more firmly than Chiang Mai, since the smaller valleys can trap smoke worse and have fewer air-filtered indoor escapes. Isaan and the central plains are not dangerous, just punishingly hot and dusty, with less payoff this time of year.

What festivals and events happen in March?

March’s anchor is Makha Bucha, one of Thailand’s most important Buddhist holidays, commemorating a spontaneous gathering of 1,250 of the Buddha’s disciples. It follows the lunar calendar, so the date moves: it fell on 3 March in 2026, and in some years it lands in late February instead, so check the official holiday calendar for your travel year. Expect candlelit evening processions at temples, a nationwide public holiday, and a one-day suspension of alcohol sales in bars, restaurants and shops.

Beyond that, National Thai Elephant Day on 13 March is marked at elephant sanctuaries and camps around the country with fruit buffets and ceremonies. Poy Sang Long, the striking Shan festival in which young boys are ordained as novice monks in colourful costume, takes place in late March or early April, mainly around Mae Hong Son (with the obvious caveat that it falls inside smoke season). Pattaya typically stages its free Pattaya International Music Festival on beachfront stages in March, with dates announced each year, so confirm the current year’s schedule before building plans around it.

How are crowds and prices in March?

March is when high season loosens its grip. Early in the month, beach destinations still feel like peak season, with busy flights, full hotels and rates to match, since the European winter-escape crowd has not gone home yet. From mid-to-late March the numbers visibly thin, availability opens up, and many hotels start discounting toward shoulder-season pricing. That makes late March a genuinely good value window: near-peak weather on the coasts without peak-season pressure. Prices vary too much by property and year to quote reliable figures here, so compare live listings for your dates, and note that Similan liveaboards and popular dive trips can still book out despite the broader slowdown.

If you are weighing March against other months, the honest comparison is with the rainy months on the other side of the calendar; our Thailand rainy season guide explains what wet season actually looks like and why it is less of a dealbreaker than most first-timers assume.

What should you pack for Thailand in March?

Pack for heat and sun, not rain. The essentials: light, loose, breathable clothing (linen and technical fabrics beat cotton once you are sweating), a wide-brim hat, sunglasses, high-SPF sunscreen, and a refillable water bottle, because dehydration in 35°C heat catches people out faster than anything else this month. Add modest temple-appropriate clothing that covers shoulders and knees, particularly relevant with Makha Bucha falling in or near March. A light rain shell is optional insurance for brief coastal showers, nothing more. Swimwear and reef-safe sunscreen earn their space, since March is prime water time on both coasts. And if the north is unavoidably on your route, pack a well-fitting N95-type mask; the flimsy surgical kind does little against PM2.5. Our full Thailand packing list covers the complete kit by season and region.

The honest verdict on March

March is a strong month for a Thailand trip built around beaches, islands and Bangkok, and a poor month for one built around the north. You trade the perfect cool-season evenings of December and January for real heat, and in exchange you get both coasts working at once, clear water, and prices that soften as the month goes on. Just respect the two hard constraints: the northern smoke, which is a health issue rather than an inconvenience, and the heat, which rewards early starts and midday retreats. Plan around those and March delivers.

For the full seasonal picture, start with Thailand weather by month and the best time to visit Thailand, and see what’s on during your dates in our live Thailand events listings.

Sources

Frequently Asked Questions

Is March a good time to visit Thailand?

Yes for the islands and coasts, no for the north. March offers reliably dry, sunny weather in Bangkok, on the Andaman coast and on the Gulf islands, with calm seas and clear water on both sides, plus thinning crowds and softening prices as the month goes on. The trade-offs are serious heat (mid-30s Celsius in the cities) and hazardous smoke across northern Thailand, where the annual burning season peaks in March. If your itinerary is beaches plus Bangkok, March works well; if it centres on Chiang Mai and the mountains, pick a different month.

How hot is Thailand in March?

Hot, and getting hotter through the month. Bangkok typically reaches 34-35°C by day and stays around 25°C at night, per long-term climate averages. Chiang Mai and the north can run even hotter, with daytime peaks of 35-38°C, though mornings and evenings there stay cooler. Coastal areas like Phuket and Koh Samui sit a little lower, roughly 26-33°C, with sea breezes taking the edge off. Humidity climbs everywhere as the month progresses, so plan sightseeing for early morning and late afternoon.

Should I avoid Chiang Mai in March?

For most travellers, yes. March is the peak of northern Thailand's burning season, when crop and forest fires push PM2.5 to unhealthy or hazardous levels; IQAir ranked Chiang Mai the 3rd most polluted major city in the world on the morning of 4 March 2026, and daily AQI readings above 150 are routine, with spikes past 200. The haze also blots out the mountain views that draw people north in the first place. If you must go, check a live AQI app daily, limit outdoor time, and wear an N95-type mask. Conditions usually begin improving from later in April.

Which Thai islands are best in March?

Almost all of them, which is unusual. The Andaman side (Phuket, Krabi, Koh Lanta, Koh Lipe, Khao Lak) is in its dry season with calm seas and some of the year's clearest water, and the Similan Islands remain open to visitors until 15 May. The Gulf side (Koh Samui, Koh Phangan, Koh Tao) is also warm, settled and mostly dry in March, having finished its own rainy season months earlier. Koh Chang and the eastern gulf islands are fine too. Pick based on vibe and budget rather than weather this month.

Does it rain in Thailand in March?

Very little in most of the country. Bangkok averages around 31 mm over roughly 3 rainy days in March, and the north is drier still. Phuket sees about 59 mm across roughly 6 rain days, usually short localized showers that pass within minutes rather than washouts. The Gulf islands are generally dry and sunny. The real rainy season does not start until roughly May or June depending on the coast, so rain should not shape your March plans.

What festivals happen in Thailand in March?

The big one is Makha Bucha, a major Buddhist holiday marking a gathering of 1,250 of the Buddha's disciples; it follows the lunar calendar and fell on 3 March in 2026, though in some years it lands in February. Temples hold candlelit processions and alcohol sales are suspended nationwide for the day. National Thai Elephant Day falls on 13 March, marked at sanctuaries around the country. Poy Sang Long, the Shan novice ordination festival, happens in late March or early April, mainly around Mae Hong Son. Pattaya usually hosts its International Music Festival in March, with dates announced each year.

Are prices lower in Thailand in March?

They start to ease, especially in the second half of the month. Early March still overlaps with the tail end of high season, so beach accommodation in places like Phuket, Krabi and Koh Samui can remain at or near peak rates. From mid-to-late March, as European and North American visitor numbers thin out, availability improves and many hotels begin discounting toward shoulder-season pricing. Exact rates vary widely by property and demand, so compare current listings rather than assuming a fixed discount.

What should I pack for Thailand in March?

Pack for heat and strong sun, not rain. Light, breathable clothing, a wide-brim hat, sunglasses and high-SPF sunscreen are the essentials, plus a refillable water bottle since dehydration sneaks up in 35°C heat. Add modest clothing that covers shoulders and knees for temples, especially around Makha Bucha. A light rain layer is optional insurance for brief coastal showers. If northern Thailand is unavoidably on your route, pack a properly fitting N95-type mask for the smoke.

Out Thailand Team

Based in Chiang Mai

A small team based in Chiang Mai. We research, write, and edit every guide together and publish under one byline, with the date each guide was last updated.