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Thailand When to Go: Seasons, Rain and Festival Timing

67 guides

Timing in Thailand splits along two lines: the northern cities and the islands. Chiang Mai and Chiang Rai deal with a cool, dry window from November to February, but the same months bring peak prices and crowds, while the burning season haze decides whether the air is worth breathing. Ayutthaya and Bangkok share that cool-season draw, yet Ayutthaya's temple walking turns brutal in the hot months and slick under rainy-season showers.

The islands diverge in ways that catch people out. Koh Lanta and Koh Phi Phi see closures and rougher crossings in the monsoon, and Maya Bay shuts from August 1 to September 30. Koh Samui and Koh Phangan run on their own rain pattern, so a wet week on one island can be dry on another. Ferries, diving and Full Moon Party dates all hinge on these shifts.

Festivals pin down dates too. Songkran in Bangkok and Chiang Mai, Loy Krathong in Ayutthaya, Yi Peng lantern nights, and the Hua Hin Jazz Festival each pull crowds into narrow windows, so matching your trip to the calendar matters as much as the forecast.

Ayutthaya

Bangkok

Chiang Mai

Chiang Rai

Hua Hin

Koh Lanta

Koh Phangan

Koh Phi Phi

Koh Samui

Koh Tao

Krabi

Pattaya

Phuket