SeasonMapKo Pha Ngan (Koh Phangan) weather in May
Thailand
May in Ko Pha Ngan: sweltering, soaked, with clean air — fine if you can take 22 rainy days.
#7 of 12 months in Ko Pha Ngan · #880 of 1383 destinations to visit in May · comfort 76/100 (tier B)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Ko Pha Ngan in May
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 — May
| Daytime high | 31°C / 88°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 27°C / 80°F | |
| Feels like (high) | 37°C / 99°F | |
| Sea temperature | 32°C / 89°F | ♨️ bath-warm |
| Rainfall | 163 mm / 6.4 in | ⛈ soaked |
| Rainy days | 22 days | |
| Humidity | 80% | 💦 very humid |
| Dew point | 25°C / 78°F | |
| Sunshine | 10.1 h/day | |
| Daylight | 12.6 h | |
| Wind | 21 km/h / 13 mph | |
| Air quality (US AQI) | 35 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Ko Pha Ngan in May
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, Gulf dry season, Long summer break in Thailand(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 May
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
Gulf dry season
15 Jan – 31 Aug · usuallyCrowdedThe Gulf runs on its own calendar: the driest, calmest stretch here is the first half of the year, while the Andaman coast is in its monsoon. Boats from Surat Thani run to schedule.
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 May — FAQ
- Is May a good time to visit Ko Pha Ngan?
- May in Ko Pha Ngan: sweltering, soaked, with clean air — fine if you can take 22 rainy days. It ranks #7 of 12 months for Ko Pha Ngan on SeasonMap's comfort score (76/100).
- What is the weather like in Ko Pha Ngan in May?
- In May, Ko Pha Ngan averages a daily high of 31.1°C and a low of 26.8°C, with about 163.4 mm of rain over roughly 21.5 rainy days.
- What is the air quality in Ko Pha Ngan in May?
- Ko Pha Ngan has a mean US Air Quality Index of about 35 in May.
Other months in Ko Pha Ngan
Compare Ko Pha Ngan in May
Warmer or cooler than Ko Pha Ngan in May
Similar destinations in Southeast Asia — May
Within 300 km: Ko Tao's Whale shark season around 15 Mar – 31 May, and Khao Lak's Manta and whale shark season around 1 Feb – 5 May.