Thailand Weather in December

December brings dry, cool weather, especially in the north. Chiang Mai and the surrounding region typically sit between 68°F and 86°F (20°C to 30°C), a welcome change after the heat of the months before. Further south, things stay warmer. Bangkok, Phuket, and Krabi average between 77°F and 90°F (25°C to 32°C), which suits beach days and outdoor plans well.

Humidity drops off sharply compared to the rainy season, making the air noticeably more comfortable. Most days bring clear skies and plenty of sun, good conditions for snorkeling, diving, or a day out in one of the national parks.

December also happens to be peak season, so popular spots fill up fast. Booking accommodations and tours early goes a long way if you want to take in the culture, the food, and the sights without fighting the crowds for a table or a room.

Air quality improves across Thailand in December compared to the months before it, mostly thanks to lower humidity and reduced pollution. Bangkok is the exception worth noting, traffic and industry still keep the city at moderate levels on some days.

Central Thailand sees a real improvement as agricultural burning tapers off, though Bangkok itself can still run moderate from vehicle emissions. Northern Thailand fares well too, with cooler, drier air and less burning keeping cities like Chiang Mai and Chiang Rai relatively clean. Southern Thailand rounds it out with some of the clearest skies in the country, particularly along the coast in Phuket and Krabi. If you're weighing this against the month before, Thailand's weather in November follows a similar clean-air pattern, just with slightly more crowd pressure building toward December.

Rarely, especially in central and northern Thailand. A few southern areas might see light showers now and then, but rain isn't something to plan around this month. It's part of why December draws so many visitors in the first place.

• Visit historical sites: the Grand Palace in Bangkok and the ancient ruins of Ayutthaya are both worth it, though they get busy this month, so an early start helps
• Catch a festival: the Chiang Mai Flower Festival and Loi Krathong both fall around this time, the latter sending floating lanterns out across the water at night
• Relax on the beaches: Phuket, Krabi, and Koh Samui all hit their stride in December for swimming, island hopping, and water sports
• Shop the Bangkok malls: end-of-year deals and Christmas promotions mean better prices, plus the decorations are worth seeing on their own
• Eat your way through the streets: pad thai, som tam, and mango sticky rice show up everywhere in the markets and night bazaars. If you're not sure where to start, our guide to Thailand's most popular foods is worth a look before you go
• Take a cultural tour: a cooking class, a temple visit to learn about Buddhist customs, or a traditional dance performance all work well this time of year
• Try regional Thai cuisine: local restaurants and fresh seafood spots are in good form during the cool, dry season
• Get outdoors: trek the jungles around Chiang Mai or snorkel the Andaman Sea while the weather holds

December pulls together nearly everything Thailand does well, sunny weather, comfortable temperatures, and a full spread of beaches, culture, and food to work through before the new year starts.