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Wondering when to go to Southeast Asia? The short answer is that November to March suits most first-time trips, but the region is so vast that there is genuinely something in season every single month. This month-by-month guide helps you match the weather to the experience you are after.
Forget the four seasons you know at home. Most of Southeast Asia runs on a simpler rhythm of a dry season and a wet (monsoon) season, and the timing shifts depending on where you stand.
The mainland (Thailand, Vietnam, Cambodia, Laos) is broadly dry and cool from November to February, hot from March to May, and wet from June to October. The catch is that the two Thai coasts and the islands of Indonesia march to their own drum, which is why you can almost always find sunshine somewhere.
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This is the classic window and, for good reason, the busiest. Skies are clear, humidity drops and evenings in the north can even feel pleasantly cool.
Book flights and standout hotels early if you are travelling over the festive period.
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Temperatures climb steadily and by April the mainland can be genuinely fierce, often into the high 30s. It is not the time for long treks, but it is superb for the beaches and islands, which stay reliably sunny before the rains arrive.
April also brings some of the region's most joyful festivals, when the heat becomes part of the fun rather than something to endure.
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Do not write off the monsoon. Rain typically falls in short, dramatic afternoon bursts rather than all-day drizzle, and the reward is emerald rice terraces, thundering waterfalls, far fewer crowds and noticeably lower prices.
This is also peak dry season for Bali and the Gulf islands such as Koh Samui, so a clever itinerary can chase the sunshine while the mainland turns lush and green.
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If it is your first time and you want the easiest weather, aim for late November to early March. You will get comfortable temperatures for temples and cities, dry days on the Andaman beaches and the full sweep of the region at its most photogenic.
On a small-group trip the timing is handled for you, with departures scheduled to land you in each place during its best window.
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