December is the sweet spot of Chiang Mai's cool season, with warm afternoons and almost no rain. It is also one of the busiest months of the year, so the weather is easy and the planning takes a little more thought.
What is the weather like in Chiang Mai in December?
December weather in Chiang Mai is dry and sunny, with mild temperatures. The long term average high is about 29°C and the average low is about 17°C, with only around 14 mm of rain in the whole month. Days feel warm in direct sun, while mornings and evenings are cool enough that most visitors reach for a light layer.
The figures come from the 1991 to 2020 climate record for Chiang Mai, which also shows roughly one rainy day across the month and about 238 hours of sunshine, a little over eight hours a day. In practice that means clear blue skies most days and very few plans spoiled by weather.
The gap between day and night is the detail that catches people out. A 17°C dawn feels properly chilly after a warm afternoon, particularly on a scooter or in an open songthaew. Higher ground outside the city is colder again, so a sunrise trip into the mountains calls for a real jacket.
Is December too crowded to enjoy Chiang Mai?
December is peak season, so expect busier temples, fuller night markets and higher demand for rooms, especially around Christmas and New Year. It rarely feels unmanageable. Booking accommodation early, visiting headline sights in the first hours of the day and saving quieter, local activities for the afternoon keeps the month relaxed.
The pleasant weather is exactly why so many people choose December, from long stay visitors escaping colder winters to families on school holidays. The Old City and the famous hilltop temple are at their most crowded from late morning onwards. Arriving early gives you cooler air and shorter queues.
Popular day trips fill up too. If you have a fixed date in mind for a cooking class, an elephant sanctuary or a mountain tour, reserve it before you travel rather than on arrival.
How should I plan my days in December?
Use the cool mornings for walking and sightseeing, then slow down in the warmest hours after lunch. Late afternoon brings golden light and easing heat, a good time for markets, rooftop views or a garden. Evenings cool quickly, so carry a layer if you will be out after dark.
A simple rhythm works well: temples and markets before noon, a long lunch, then something outdoors but unhurried. Shaded gardens, riverside cafés and parks all suit the early afternoon, when the sun is at its strongest even in the cool season. Our guide to Chiang Mai beyond temples and markets has more ideas for filling those hours.
If you are heading up a mountain, plan an easy day afterwards. Early starts and cold summits are tiring, and a gentle recovery day after Doi Inthanon makes the rest of the trip more enjoyable.
What should I pack for Chiang Mai in December?
Bring light, breathable clothes for warm days and one warm layer for cool mornings and nights. Add a proper jacket for any mountain sunrise. Sunscreen, sunglasses and a hat matter more than rain gear, since December sees very little rain. Pack something that covers shoulders and knees for temple visits.
Comfortable walking shoes earn their place, as the Old City is best explored on foot and temple visits mean slipping shoes on and off all day. Sandals that are easy to remove help. A refillable water bottle is useful too, because the dry air and strong sun dehydrate you faster than the mild temperatures suggest.
Where can families and groups spend a relaxed December afternoon?
Look for outdoor spots with shade and something to do that does not need a guide or a booking. Gardens, parks and casual activity venues suit the warm hours well. Mini Golf CNX is one option: an 18-hole garden course where you can walk in, play a round in about one to two hours and cool off with ice cream.
With dry weather almost guaranteed, outdoor plans are low risk in December, which is helpful when you are travelling with children or a mixed group. You can find details of the course and the full list of what is on site below.
| Detail | What to expect |
|---|---|
| Course | 18-hole garden mini golf in Chiang Mai |
| Booking | None needed, walk in |
| Opening hours | Every day, 09:00 to 18:00 |
| Round length | About 1 to 2 hours |
| Food and drink | Cold drinks, snacks and ice cream |
| Seating | Shaded garden seating |
| Lawn games | Cornhole, board games, frisbee |
| Groups and events | Welcome, message ahead so space is set aside |
What changes after December?
January carries on with similar cool, dry weather and steady crowds, making it an easy alternative if December dates are hard to find. As the dry season goes on, days gradually get warmer, so December and January are the most comfortable choices for anyone who wants mild afternoons and fresh nights.
If your trip runs over the New Year or you are weighing up a later visit, our Chiang Mai January visit guide covers what to expect in the following weeks.