Best Time to Visit Southeast Asia: Weather by Country

The best time to visit most of Southeast Asia is the cooler, drier stretch from roughly November to April, but that rule breaks down quickly once you look at individual coasts. Thailand, Vietnam, Indonesia, Malaysia and the Philippines each run on their own weather calendar, and a perfect beach month on one side of a country can be a washout on the other.

The region is shaped by two monsoons. A south-west monsoon brings rain from roughly May to October to many western coasts, and a north-east monsoon brings it to many eastern coasts from roughly October to January or later. Add mountains, islands and the typhoon belt, and you get a patchwork. The good news is that "rainy season" rarely means constant rain: it usually means heavy afternoon downpours, fewer crowds and greener scenery.

When is the best time to visit Thailand?

For most trips, November to February is the sweet spot: lower humidity, sunshine and comfortable evenings. March to May is hot, sometimes brutally so, and the northern burning season can leave Chiang Mai hazy from about February into April. Check air quality if you are sensitive to it.

The monsoon is where Thailand gets interesting, because the country has two coasts that do not match. The Andaman side (Phuket, Krabi, Koh Lanta, Koh Phi Phi) gets its wettest weather from roughly May to October, with rougher seas and some boat services reduced. The Gulf side (Koh Samui, Koh Phangan, Koh Tao) is at its best in the middle of the year and tends to see its heaviest rain later, around October to December.

So if you want a beach in July, think Gulf. If you want one in January, think Andaman.

What is Vietnam's weather like in each region?

Vietnam is long and thin, so it effectively has three climates rather than one.

• North (Hanoi, Ha Long Bay, Sapa): four seasons. Winter, roughly December to February, is cool and grey, and Sapa can be properly cold. Spring and autumn are the pleasant windows. Summer is hot, humid and wet.
• Central (Hue, Da Nang, Hoi An): drier from roughly February to August. The wet season is typically autumn into early winter, with flooding possible in places like Hoi An and typhoon risk in the months before.
• South (Ho Chi Minh City, the Mekong Delta, Phu Quoc): warm all year, with a dry season from roughly November to April and a wetter season for the rest, usually in short, heavy bursts.

A north-to-south trip in spring, or a south-to-north trip timed around the central coast being dry, is the usual way to avoid the worst of each region.

When should I go to Bali and Indonesia?

Bali has a dry season from roughly April to October, with July and August the busiest and most expensive-feeling months. The wet season runs roughly November to March: humid, with frequent downpours, but rarely all day. Shoulder months such as May, June and September often give the best balance of weather and crowds.

Indonesia is huge and not uniform. Lombok and the Gili Islands broadly follow Bali's pattern. Further afield, places such as parts of Sumatra and Sulawesi have their own rain patterns, so check the specific island before you book. Treat the above as a guide for Bali and its neighbours only.

Is Malaysia's east coast different from the west coast?

Yes, and this is the mistake travellers make most often. The west coast (Penang, Langkawi, Kuala Lumpur) is typically best from roughly December to March. The east coast and its islands (Perhentian Islands, Redang, Tioman) are the opposite: the north-east monsoon brings rough seas from around mid-October to the end of February, and most island resorts, dive centres and regular boat services shut down for that stretch, with the islands generally reopening in early March. Their good season is roughly March to early October.

Borneo (Sabah and Sarawak) has its own pattern, with wetter weather in the early months of the year. Kuala Lumpur itself is warm and prone to afternoon storms at almost any time, so just carry a small umbrella.

When is typhoon season in the Philippines?

The typhoon season runs roughly June to November, and the national weather agency PAGASA puts the peak at July through October. Of the roughly 20 tropical cyclones that form in the region each year, about eight or nine cross the Philippines. Not every island gets hit equally: storms most often cross the northern and eastern Philippines, so Luzon, Samar and Leyte carry more risk than the southern islands, such as Mindanao, which are less commonly affected.

The driest, most reliable window for island hopping in places like Palawan, Cebu and Boracay is roughly December to May, with March to May getting hot. If you must travel in typhoon season, build in flexible dates, buy insurance that covers weather disruption, and follow the national weather agency for updates before ferries and flights.

What about Japan, Korea and Taiwan?

These are the contrast, because they are temperate rather than tropical, and the question is not wet versus dry but hot versus cold.

• Japan: spring (cherry blossom, roughly late March to April) and autumn (October to November) are the classic windows. June brings a rainy spell, summer is hot and humid, and typhoons can disrupt travel in late summer and early autumn. Winter suits skiing in Hokkaido and Nagano.
• South Korea: spring and autumn are comfortable and scenic. Summer has a humid monsoon spell, and winters are cold and dry.
• Taiwan: semi-tropical, with plum rains in spring, a hot and typhoon-prone summer, and a mild winter in the south. October to December is usually a good balance.

How should I plan mobile data for a multi-country trip?

Weather decides your route, and a route through several countries usually means several networks. A travel eSIM for the region or country you are visiting lets you check forecasts, ferry changes and storm warnings the moment you land, which matters most when a storm forces a change of plans.

Check that your phone supports eSIM and is unlocked, then install the eSIM before you travel and switch it on at arrival. MochiSim eSIMs are data only, with no phone number, calls or SMS, so keep your home SIM active in the second slot if you need text messages for bank codes or booking verifications. Set the eSIM as your data line and turn off data roaming on the home SIM. Always compare your route with the plan's coverage list before buying.