South-East Asia doesn't have one dry season. It has several, and they arrive on different coasts at different times of year. That is good news for anyone travelling slowly: with a bit of planning you can follow fair weather from the Andaman Sea to Bali to northern Vietnam and back, spending most of a year in the region without sitting through a proper washout. It also means the postcard you saw of a sunny Thai beach in July may well have been taken somewhere else entirely.
Two monsoons, not one
The south-west monsoon runs roughly from May to October. It soaks Thailand's Andaman coast, Cambodia, Laos, southern Vietnam and much of Myanmar. The north-east monsoon runs roughly November to March and hits a different set of places: Vietnam's central coast, Thailand's Gulf islands, the east coast of Peninsular Malaysia and the Philippines.
So in July, Bali is at its driest and breeziest while Phuket is being rained on most afternoons. In October, northern Vietnam is entering its loveliest stretch while Hoi An is bracing for floods. Once you internalise that, the region stops looking like a lottery.
There are local quirks on top of the broad pattern, too. Northern Thailand, Laos and northern Myanmar have a smoky season; the Gulf coast of Thailand runs almost counter to the Andaman coast; and Indonesia's rain is often short and dramatic rather than all-day drizzle.
November to February: the easy window
This is the stretch most people mean when they say "the best time to go". Thailand's Andaman coast, Cambodia, Laos, Myanmar and southern Vietnam are dry, comfortable and cooling down after the rains.
Hanoi and the far north are another matter. January and February bring grey skies, drizzle and temperatures that call for a jacket — atmospheric around Sapa and Ha Giang, but not a sunshine holiday. Bali sits this one out, with its wet season running roughly November to March: heavy, often short afternoon downpours. The Philippines is in its drier half from around December, though the tail end of typhoon season can linger.
Costs and crowds peak from mid-December to mid-January, and again over Chinese New Year and Vietnamese Tet, which fall in late January or February depending on the lunar calendar. Tet is worth understanding: trains, buses and domestic flights sell out, plenty of family-run businesses close for a week, and prices jump. Either book months ahead or deliberately sit it out somewhere quiet.
March to May: heat, haze and shoulder-season bargains
Temperatures climb across Thailand, Myanmar, Cambodia, Laos and Vietnam. April can be punishing inland, and Songkran — the Thai New Year water festival in mid-April — shuts down swathes of the country for a few days while filling every bus and guesthouse.
Two things to plan around. First, the burning season in northern Thailand, Laos and northern Myanmar, when agricultural burning and forest fires push air quality down noticeably from around February to April. If you have any respiratory sensitivity, that is not the moment for Chiang Mai. Second, Songkran itself: wonderful if you want it, inconvenient if you don't.
The rewards are real. Vietnam's central coast around Hoi An and Da Nang is warm, dry and swimmable, and the Andaman islands are still in decent shape before the monsoon arrives. Room rates soften noticeably in May.
June to August: Indonesia's turn
Bali, Lombok, Java, Komodo and Flores settle into their dry season. This is prime time for diving, trekking and island-hopping — which also makes July and August the busiest and priciest weeks in Bali, thanks to the European summer holidays. Book villas and popular trekking slots well ahead.
Vietnam's central coast stays dry into August. The north is hot and wet, and hill country around Sapa can be muddy, with occasional landslide risk on mountain roads.
Thailand's west coast is in its wet season: cheap rooms and green landscapes, less reliable liveaboard diving. The Gulf islands — Samui, Phangan, Tao — generally fare better. The Philippines is in typhoon season, so keep plans flexible and avoid tight onward connections.
September and October: the awkward months
This is where long-term travellers get caught out, and where local knowledge pays for itself.
Vietnam's central coast takes the worst of it, with Hue and Hoi An prone to flooding in October and November. Thailand's Gulf coast has its own wet spell, with Koh Samui typically wettest from around October to December — the opposite of Phuket. Bali's rains return in November.
Better bets: northern Vietnam, often at its best in October; northern Thailand, where the rain eases late in the month; Komodo and Flores; and Raja Ampat, whose season usually opens around October. Malaysia's east coast islands stay pleasant into September before closing for the north-east monsoon.
The month-by-month shortlist
- January: Thailand (both coasts), Cambodia, Laos, southern Vietnam, the Philippines
- February: the same, plus Vietnam's central coast drying out; the north still grey and damp
- March: central and southern Vietnam, the Andaman islands, Myanmar — but heat building and northern haze worsening
- April: Songkran in Thailand, central Vietnam, Bali shoulder season. Skip northern Thailand and Laos if air quality matters to you
- May: Bali and Java drying out, central Vietnam, Andaman coast cheap with occasional showers
- June: Bali, Lombok, Komodo, central Vietnam, Thailand's Gulf islands
- July: Bali at its driest and busiest, central Vietnam, Gulf islands, Malaysia's east coast
- August: much the same, with northern Vietnam wet and the Philippines risky
- September: Malaysia's east coast, northern Vietnam late in the month, Bali shoulder, Komodo
- October: northern Vietnam, northern Thailand late in the month, Flores and Komodo, Raja Ampat opening
- November: Thailand's Andaman coast, Cambodia, Laos, southern Vietnam, Myanmar
- December: the same, but book early — this is peak season
Booking, bases and the boring bits
Time your moves to land a week or two before peak season starts, or a week after it ends, and you'll pay noticeably less for the same weather. For slow travel, cities such as Chiang Mai, Da Nang, Ubud, Canggu and Luang Prabang have well-established monthly rental markets; guesthouses will often quote a lower nightly rate if you ask directly for 28 nights or more.
During typhoon and monsoon season, favour flexible domestic airfares over the cheapest non-refundable ones, and never book a tight same-day connection between a flight and a ferry. Island ferries get cancelled, and airline schedules slip.
Insurance is worth reading properly rather than skimming. Check that your policy covers trip disruption, missed connections and medical evacuation, and don't assume weather-related cancellations are included by default. Visa and entry rules change often and vary by nationality, so verify them with the official immigration website of each country rather than a forum thread. And
Photo: Quý Nguyễn / Pexels
