Travelzoo Asia

Although relatively compact, Southeast Asia has a seemingly infinite amount of climates to match its varied mountains, beaches, religions and cuisines. Weather patterns vary wildly even within the same country — in Thailand, for instance, when it’s the sunny dry season in Phuket, it’s time for monsoons less than 200 miles away on the island of Koh Samui.

Whether planning a weeklong beach holiday or a three-month trek around the region, it’s useful to know what weather to expect. Here’s a handy guide to high and low seasons in some of Southeast Asia’s most popular spots.

Bali, Indonesia

When to go: April to October. Temperatures average 75-86 F, and the weather is mostly dry. July to September is peak holiday season and when you can expect to pay the highest rates.

Rainy season: December to February. These months average 12 inches of rain, though it’s more akin to short, intense showers than daylong deluges, meaning you can still enjoy an excellent (and cheap) holiday.

Malaysia

When to go: January to March and June to September. Malaysia straddles the equator, so it’s hot and humid year-round but these months have the lowest average rainfall.

Rainy season: October to December, though monsoons continue through to February in Borneo.

Singapore

When to go: January to October. Like Malaysia, tiny Singapore’s weather stays fairly constant throughout the year, with temperatures only ranging from 86-91 F. June to August is driest, though flash thunderstorms and stifling humidity are never out of the question.

Rainy season: November to December average about 10 inches of rain each per month.

Thailand

As one of the larger countries in the region, and given its proximity to both the Gulf of Thailand and the Andaman Sea, Thailand sees a variety of different weather patterns throughout the year. The good news is that because Koh Samui and Phuket have opposite rainy seasons, a world-class beach is never too far away.

• Bangkok: When to go: November to January is the “cool season, ” meaning average temperatures drop into the upper 70s. February to May is relatively dry, but humidity is on the rise. Rainy season: June to October.
• Chiang Mai: When to go: November to February. Thais prefer escaping to the country’s second-largest city for its proximity to mountains and cooler temperatures. In the evening temperatures can get as low as 59 F, but hover around a sunny 86 F in the daytime. Temperatures rise to between 59-104 in March and April. Rainy season: May to October.
• Koh Samui: When to go: April to September and January to March. Rainy seasons: October to December. And it rains A LOT.
• Phuket: When to go: November to February is known as the “cool” season, meaning temperatures hover around 86 during the day and dip to a comfortable 75 at night. March to May is very hot, which isn’t such a bad thing when the beach is nearby. Rainy season: Monsoon season is May to October although, like Bali, showers are generally on the brief and intense side, meaning you’re apt to find plenty of great deals (and value) at resorts.

Vietnam

Like Thailand, Vietnam has three distinct climates. Hanoi gets downright chilly during the winter months, Ho Chi Minh City sees monsoons and temperatures remain fairly pleasant in central Vietnam throughout the year.