Thailand in December brings 25-31°C temperatures, 10-30mm rainfall, and high tourist crowds. Here's everything you need to know to plan the perfect December trip to Thailand — from weather patterns and costs to events and packing essentials.
Climate This Month
Thailand in December averages 25-31°C with approximately 10-30mm of rainfall. Peak dry season. Days are generally shorter but often clear. The weather makes December a popular but rewarding times to visit.
Busy or Quiet?
Tourist levels are high in December. Expect higher accommodation prices and busier attractions — book at least 2-3 months ahead for popular spots.
Budget travelers should expect 20-40% higher costs compared to shoulder season.
What's Happening
Top highlights: Peak dry season, Christmas/NYE celebrations, ideal island hopping.
December is particularly good for cultural experiences, museums, food tours, and indoor attractions with occasional outdoor days. Beach activities and water sports are at their best.
What to Pack
Essential packing list: Summer clothing, swimwear, sun protection, light rain jacket. Don't forget a reusable water bottle — hydration is key in the warmth.
Our Take
Yes — December is popular for good reason, offering peak dry season. Despite higher prices and bigger crowds, the weather and events make it worth the premium.
The December Catch: Which Coast Is Actually Dry
The single fact that decides your December trip is which side of the country you book. Thailand has two coasts on opposite monsoon clocks, and December is the month they diverge most. The Andaman side (Phuket, Krabi, the Phi Phi Islands) sits firmly in its dry season, with highs around 31C and warm nights near 25C. The Gulf side (Koh Samui and Koh Phangan) is still shaking off its own wet season early in the month, so the first two weeks can deliver grey skies and short downpours while Phuket stays cloudless. If your dates fall before mid-December and you want guaranteed beach weather, point yourself west.
Inland, the story flips again. Bangkok runs hot and bone-dry, around 31C by day dropping to about 21C overnight. Chiang Mai turns genuinely cool, with nights near 15C, and up on Doi Inthanon (Thailand's highest peak at 2,565m) the pre-dawn air sits close to freezing, so the sunrise crowds wear coats.
- West coast for reliable December sun; east coast is a gamble until late month.
- Pack a fleece for the north, not just the rain jacket suggested above.
FAQ
What is the weather like in Thailand in December?
Temperatures range from 25-31°C with about 10-30mm of rainfall. Peak dry season.
Is December too crowded in Thailand?
Crowd levels are high. Book accommodations and major attractions well in advance.
What should I pack for Thailand in December?
Summer clothing, swimwear, sun protection, light rain jacket.
📅 Other months: Thailand in February · Thailand in January · Thailand in November
Thailand in December: peak dry-season perfection
December is Thailand at its best — the cool, dry season in full swing, with sunny skies, comfortable temperatures and the islands looking their postcard best. It's peak season for a reason.
Weather & what it's like
Warm days, lower humidity, and the most reliable beach weather of the year on both coasts. Bangkok and the north (Chiang Mai) are pleasantly cooler.
Crowds & events
The busiest, priciest month — book beaches and flights well ahead, especially around Christmas-New Year. The festive buzz, full-moon parties and cool-season festivals make it lively.
What to pack
Beach and summer clothes, sun protection, and a light layer for cool northern evenings.
Thailand In December FAQ
Is December a good time to visit Thailand?
The best — cool, dry and sunny; just the busiest and most expensive.
Is December good for the Thai islands?
Yes — peak beach weather on both coasts; book well ahead.
Plan Your Thailand Trip
More Thailand guides: Best Time to Visit Thailand · How Much Does a Trip to Thailand Cost? · Is Thailand Safe?
📖 Read our Complete Travel Guide to Thailand for the full picture.
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Written by
John Morrison is the founder and lead travel writer at Packzup. Over the past decade he has explored destinations across Africa, the Americas, Asia, Europe, the Middle East, and Oceania — always self-funded, never on a press trip.