SeasonMapKo Pha Ngan (Koh Phangan) weather in December
Thailand
December in Ko Pha Ngan: hot, soaked, with muggy air — fine if you can take 14 rainy days.
#9 of 12 months in Ko Pha Ngan · #636 of 1383 destinations to visit in December · comfort 73/100 (tier B)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Ko Pha Ngan in December
Other months in Ko Pha Ngan
Ko Pha Ngan's forum puts March close to the neighbouring months either side — regulars comparing February and April describe similar humidity with only a degree or two of difference, which puts March comfortably in the middle. Expect warm, humid days typical of the island's dry-ish season, with the occasional shower rather than sustained rain.
Add your own note from Ko Pha Ngan's card on the map.
Ko Pha Ngan climate normals — December
| Daytime high | 28°C / 83°F | 🥵 hot |
|---|---|---|
| Nighttime low | 25°C / 78°F | |
| Feels like (high) | 32°C / 90°F | |
| Sea temperature | 29°C / 83°F | ♨️ bath-warm |
| Rainfall | 203 mm / 8 in | ⛈ soaked |
| Rainy days | 14 days | |
| Humidity | 79% | 💦 very humid |
| Dew point | 24°C / 74°F | |
| Sunshine | 9.5 h/day | |
| Daylight | 11.6 h | |
| Wind | 24 km/h / 15 mph | |
| Air quality (US AQI) | 52 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Ko Pha Ngan 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 crowdsFull Moon Party, Christmas and New Year peak, school holidays in 5 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Ko Pha Ngan'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).
Fair weatherKo Pha Ngan's weather peaks January–March.
Best weatherFair weatherToughest weather
What's on in Ko Pha Ngan in December
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Festival
Full Moon Party
1 Jan – 31 DecMajor festivalCrowdedBook earlyHaad Rin fills once a lunar month, every month, and the island's boats and rooms price around it. Arrive two days either side and it is a different, much quieter island. Source ↗
- Season
Northeast monsoon
15 Oct – 31 Dec · usuallyRiskThe wettest weeks of the Gulf year, with days of rain rather than showers and the odd storm that suspends the ferries entirely. Rates fall to their lowest and half the beach bars shut.
- Holiday
Christmas and New Year peak
18 Dec – 5 JanChristmas & New YearCrowdedBook earlyThe busiest and dearest fortnight on the island, and it lands in the middle of the wet season. Boats are added, rooms triple, and the new-year party is the biggest of the year. Source ↗
Nearby, and something's on
Within 300 km of Ko Pha Ngan — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Ko Pha Ngan?
Ko Pha Ngan in December — FAQ
- Is December a good time to visit Ko Pha Ngan?
- December in Ko Pha Ngan: hot, soaked, with muggy air — fine if you can take 14 rainy days. It ranks #9 of 12 months for Ko Pha Ngan on SeasonMap's comfort score (73/100).
- What is the weather like in Ko Pha Ngan in December?
- In December, Ko Pha Ngan averages a daily high of 28.3°C and a low of 25.3°C, with about 202.7 mm of rain over roughly 14.3 rainy days.
- What is the air quality in Ko Pha Ngan in December?
- Ko Pha Ngan has a mean US Air Quality Index of about 52 in December.
Other months in Ko Pha Ngan
Compare Ko Pha Ngan in December
Warmer or cooler than Ko Pha Ngan in December
Similar destinations in Southeast Asia — December
Within 300 km: Khao Sok's Morning mist on Cheow Lan around 1 Nov – 15 Feb, and Krabi's Dry season, flat Andaman around 1 Nov – 20 Apr.