What is Thailand like in December and January, and where should you go?

Quick answer: where to go in December and January

• Bangkok and central Thailand: go. Dry, about 23 to 33°C (73 to 91°F), the least humid time of year.

• Chiang Mai, Chiang Rai, Pai, Mae Hong Son: go. The coolest, clearest months, with nights around 15°C (59°F) in Chiang Mai and colder in the hills. Burning-season haze usually starts later, from about February.

• Andaman coast (Krabi, Ao Nang, Railay, Phuket, Koh Lanta, Phi Phi): go. The calm, dry window runs December to March.

• Khao Sok: good. Drier trails and a calm Cheow Lan Lake.

• Gulf islands (Samui, Phangan, Tao): risky in December, better in January, best from February.

• Avoid if you can: booking the 24 December to 2 January window late. Prices for beach rooms and domestic flights peak then.

December vs January, region by region

Bangkok. Both months are dry with almost no rain. December edges January for the coolest mornings. Plan temples for early morning anyway; the sun is strong by 11am. See Bangkok in 3 days and where to stay in Bangkok.

The north. This is the most pronounced cool season in Thailand, with only about 10 to 20 mm of rain a month. Days reach the high 20s °C, but mornings on Doi Inthanon or in Mae Hong Son can drop close to single figures, so pack a fleece. We were in Chiang Mai from 22 to 28 December 2022 and in Chiang Rai from 28 December to 4 January. See how many days in Chiang Mai, how many days in Chiang Rai and our Chiang Mai guide.

Andaman coast. The northeast monsoon that soaks the Gulf blows offshore here, so seas flatten and longtail and island-hopping trips run reliably. December and January rain is light. This is the coast to choose for a Christmas beach. We spent 13 to 17 January 2023 in Ao Nang after four nights in Khao Sok; see how many days in Ao Nang and the Ao Nang to Railay longtail guide.

Gulf coast. Koh Samui's wettest month is November, often around 300 mm or more on long-term averages, and December still typically sees roughly 150 to 200 mm, with rough seas that can cancel Koh Tao snorkel trips. By January rain usually falls to well under 100 mm. If Samui is the point of your trip, aim for mid-January or later; if you are travelling in December, choose the Andaman side.

Khao Sok. Rainforest gets rain in every month, but December and January are among the driest. Cheow Lan Lake trips run year-round; read the Khao Sok floating bungalow guide and how many days in Khao Sok.

Holidays and events in December 2026 and January 2027

• 5 December 2026 (Saturday): King Bhumibol's birthday and Father's Day, with Monday 7 December listed as the substitute holiday. Expect a long weekend of domestic travel.

• 10 December 2026 (Thursday): Constitution Day. Banks and government offices close.

• 24 to 25 December: not public holidays. Malls and hotels decorate, and Bangkok's big malls are busy, but temples, markets and transport run as normal.

• 31 December 2026 and 1 January 2027: New Year's Eve and New Year's Day are holidays, making a Thursday-to-Sunday long weekend. Domestic flights, buses and beach rooms fill first. Bangkok's riverside and big malls usually host countdown fireworks; check each venue's announcement in December.

Chinese New Year falls on 6 February 2027, after this window; see our Asia festival calendar 2027. Loy Krathong and Yi Peng fall in November, covered in our Yi Peng 2026 guide.

Prices, crowds and booking lead time

Peak pricing runs from about 20 December to early January, and the Andaman beaches and Koh Samui climb most. The north and Bangkok are busy but have so many rooms that late bookings are still possible. Practical moves:

• Book beach rooms and the Bangkok to Chiang Mai sleeper first. The overnight train has limited berths and sells out around the holidays; see the sleeper train guide.

• Put the beach in mid-January. Early January is still the holiday peak; the week after the schools restart is noticeably calmer, and you still get dry Andaman weather.

• Do the north over Christmas, the beach after New Year. That is the shape of our own route, and it matches the weather: cool north in late December, calm seas in January.

For a full cost breakdown, see how much a trip to Thailand costs, and use Grab or Bolt in Bangkok rather than street taxis (Grab vs Bolt).

Entry rules for this season: 30 days, TDAC and what to pack

The Royal Gazette notices published on 31 August 2026 ended the 60-day exemption. From 15 September 2026, visitors from 60 countries and territories, including the US, UK, Canada, Australia and the EU, get 30 days visa-free, for tourism only. That fits a December-to-January trip of up to a month, but a six-week winter like ours would now need a visa or an extension. Details are in do I need a visa for Thailand.

Everyone also completes the Thailand Digital Arrival Card online before arrival: our TDAC guide walks through it.

Pack for two climates: light clothes for 33°C Bangkok and the beaches, and a warm layer for northern mornings. Temples need covered shoulders and knees; see what to wear in Thailand and the temple dress code.

A December and January route that follows the weather

For two weeks: 3 nights Bangkok, the overnight train to Chiang Mai for 4 nights, then fly south to Krabi for 5 to 6 nights in Ao Nang or Railay, with a day back in Bangkok before flying out. For three to four weeks, add Sukhothai and Chiang Rai on the way north and Khao Sok on the way to the coast, as our route did. Our 2-week Thailand itinerary and 6-week route give the day-by-day versions, and the best time to visit Thailand guide covers the other ten months.

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