Ko Chang (Koh Chang) weather in December
December in Ko Chang: sweltering, dry, with clean air — fine if you can take 35°C afternoons.
Updated September 2026 · climate normals from ERA5 reanalysis
#1 of 12 months in Ko Chang · #37 of 1413 destinations to visit in December · comfort 92/100 (tier S)
- Days
- 31°C
- Nights
- 25°C
- Wet days
- 5
- Sun
- 9.7 h
- Humidity
- 70%
- Daylight
- 11 h
Traveller notes on Ko Chang in December
Forum posters describe December as close to ideal here - sunny, not too hot, minimal rain expected, with the sea reported flat, clear and calm under bright blue skies from November onward. Daytime highs are commonly described in the low-30sC, with overnight temperatures posters call cool by tropical-island standards - typically settling in the low-to-mid-20sC, though a windier night can feel noticeably chilly to some visitors, prompting a few to skip the air conditioning and just leave the window open instead. December is peak season across Thailand, so posters note it's also one of the busier, pricier months, with the island reported quieter only in the first couple weeks before the holiday rush sets in.
Other months in Ko Chang
Ko Chang's forum is honest that June is historically one of the wettest months on the island, and which kind of week you get - mostly sunny with a passing shower, or grey and wet for days - genuinely comes down to luck. Posters were consistent that it's rare for rain to last an entire day; more often it's a short afternoon shower or a late-night thunderstorm. The trade-off for accepting rougher seas and real rain risk is a much quieter island and waterfalls running at their most spectacular - some visitors specifically choose this season for the jungle and falls over the beach.
Add your own note from Ko Chang's card on the map.
Ko Chang climate normals — December
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Ko Chang in December
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
Peak crowdstravelers describe it as peak season, High season on the island, Christmas and New Year peak
Sourced from traveler notes: “…tioning and just leave the window open instead. December is peak season across Thailand, so posters note it's also one of the busie…” — Tripadvisor community
Peak crowdsBusyShoulder seasonQuiet
Best months for Ko Chang's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Best weatherKo Chang's weather peaks December–February.
December includes Wreck and reef diving season.
Best weatherFair weatherToughest weather
What's on in Ko Chang in December
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
High season on the island
1 Nov – 30 Apr · usuallyDry seasonCrowdedCalm water on the west-coast beaches, every ferry from Laem Ngop running, and the whole island open. It is also the only stretch when the road over the ridge is not a river.
- Nature
Wreck and reef diving season
1 Nov – 30 Apr · usuallyDive seasonThe months the boats run south to the HTMS Chang wreck and the Rang islands, when visibility is worth the crossing. Outside them most shops simply shut.
- Holiday
Christmas and New Year peak
18 Dec – 5 JanChristmas & New YearCrowdedBook earlyThe fortnight everything on the island sells out at once, including the car ferry slots. Book the crossing as carefully as the room. Source ↗
Nearby, and something's on
Within 300 km of Ko Chang — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Ko Chang?
Ko Chang in December — FAQ
- Is December a good time to visit Ko Chang?
- December in Ko Chang: sweltering, dry, with clean air — fine if you can take 35°C afternoons. It ranks #1 of 12 months for Ko Chang on SeasonMap's comfort score (92/100).
- What is the weather like in Ko Chang in December?
- In December, Ko Chang averages a daily high of 31.4°C and a low of 25.1°C, with about 25.6 mm of rain over roughly 4.8 rainy days.
- What is the air quality in Ko Chang in December?
- Ko Chang has a mean US Air Quality Index of about 35 in December.
Within 300 km: Pattaya's Gulf dry season around 1 Nov – 30 Apr, and Siem Reap's Dry season around 15 Nov – 30 Apr.