SeasonMapKo Phi Phi (Phi Phi) weather in September
Thailand
September in Ko Phi Phi: hot, soaked, with clean air — a gamble, with 24 rainy days.
#11 of 12 months in Ko Phi Phi · #1113 of 1383 destinations to visit in September · comfort 60/100 (tier C)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Ko Phi Phi in September
Other months in Ko Phi Phi
Ko Phi Phi's forum calls February one of the driest, sunniest stretches of the year — regulars who visited in January reported blue skies and no rain, and expect February to run much the same. It's busier than the shoulder months of May and June, but regulars say it's a step down from the Christmas and New Year crush.
Add your own note from Ko Phi Phi's card on the map.
Ko Phi Phi climate normals — September
| Daytime high | 28°C / 83°F | 🥵 hot |
|---|---|---|
| Nighttime low | 26°C / 79°F | |
| Feels like (high) | 32°C / 90°F | |
| Sea temperature | 30°C / 86°F | ♨️ bath-warm |
| Rainfall | 309 mm / 12.2 in | ⛈ soaked |
| Rainy days | 24 days | |
| Humidity | 82% | 💦 very humid |
| Dew point | 24°C / 75°F | |
| Sunshine | 8.8 h/day | |
| Daylight | 12.2 h | |
| Wind | 24 km/h / 15 mph | |
| Air quality (US AQI) | 32 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Ko Phi Phi in September
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.
Quietschool holidays in 3 of the markets that fill it, one of its worst months for weather(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Ko Phi Phi'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).
Toughest weatherKo Phi Phi's weather peaks January–March, best around February.
Best weatherFair weatherToughest weather
What's on in Ko Phi Phi in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Southwest monsoon
15 May – 31 Oct · usuallyRiskSwell on the exposed side, occasional cancelled ferries, and a village running at maybe a third of its capacity. Rooms cost a fraction of what they do in January.
- Closure
Maya Bay closed
1 Aug – 30 SepThe park authority shuts the bay for two months every year so the reef and the beach can recover. Boat tours still run around the island; they just cannot go in. Source ↗
- Season
Wet season
MonsoonRisk24 rainy days and about 309 mm in the month — the real kind of rainy season, not afternoon showers.
from the climate normals
Nearby, and something's on
Within 300 km of Ko Phi Phi — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Ko Phi Phi?
Ko Phi Phi in September — FAQ
- Is September a good time to visit Ko Phi Phi?
- September in Ko Phi Phi: hot, soaked, with clean air — a gamble, with 24 rainy days. It ranks #11 of 12 months for Ko Phi Phi on SeasonMap's comfort score (60/100).
- What is the weather like in Ko Phi Phi in September?
- In September, Ko Phi Phi averages a daily high of 28.1°C and a low of 26.2°C, with about 309.1 mm of rain over roughly 24 rainy days.
- What is the air quality in Ko Phi Phi in September?
- Ko Phi Phi has a mean US Air Quality Index of about 32 in September.
Other months in Ko Phi Phi
Compare Ko Phi Phi in September
Warmer or cooler than Ko Phi Phi in September
Similar destinations in Southeast Asia — September
Within 300 km: Ko Tao's Clear water, dive season around 1 Feb – 30 Sep, and Ko Pha Ngan's Full Moon Party on 1 Jan – 31 Dec.