Ko Phi Phi (Phi Phi) weather in May
May in Ko Phi Phi: sweltering, soaked, with clean air — fine if you can take 25 rainy days.
Updated September 2026 · climate normals from ERA5 reanalysis
#9 of 12 months in Ko Phi Phi · #1077 of 1413 destinations to visit in May · comfort 67/100 (tier C)
- Days
- 29°C
- Nights
- 27°C
- Wet days
- 25
- Sun
- 9.5 h
- Humidity
- 81%
- Daylight
- 13 h

Traveller notes on Ko Phi Phi in May
Notes from nearby Phuket (45 km away)
Ko Phi Phi doesn't have its own notes for May yet — these are about Phuket, close enough to share the season.
Phuket-forum threads on May weather place it right at the start of the green season - hot and humid between showers, with posters generally expecting around an hour of rain most days rather than a full washout, and conditions described as noticeably less wet than the August-through-October stretch later in the year. Experiences vary trip to trip: some visitors report a stretch of very hot, mostly clear days, others get the more typical reliable afternoon downpour. The clearest upside is value - hotel prices drop meaningfully and the island runs far less crowded than the December-to-March high season. The one caution: posters flag rougher seas can make swimming unsafe on certain beaches, worth checking flag warnings. The record: 33.2C days feeling like a punishing 39C, 26.1C nights, a notably high 280mm across 25.4 days, 81 percent humidity, a 31.2C sea and 9.2 hours of sun.
Other months in Ko Phi Phi
Regulars are specific this island falls within the region's dry season alongside December, typically drier than nearby Koh Samui even if outcomes genuinely vary year to year - most years staying mostly dry with a good cooling breeze, though some years bring real storms, strong winds and rough seas instead. Our row backs that hot, genuinely wet read, 28.4C reading as a hot 32C, over 25.6C nights feeling 28C, with a substantial 85.1mm of rain across 7.7 days and humidity at 78 percent. Regulars are consistent nearby Phuket reads as about as good as it gets this time of year, plenty of sunshine and very little rain, a useful comparison point if conditions here turn unsettled. The sea sits at a bath-warm 28.6C. The record: 10.2 hours of sun, a 24.1 kph wind and AQI 45.
March is described on the Thai boards as one of the driest and hottest months of the year, and with April it is the peak of the Andaman season - so the weather that brings everyone here is also what fills the boats. Our row agrees on all three counts: 30.4mm of rain across 6.8 days, 29C reading as 35C at 77 percent humidity, and nights that never drop below 26.6C. The sea is 29.2C, which is warm enough to be no relief at all. The one mercy is a 22.2 kph breeze off the water. Anything strenuous - the viewpoint climb in particular - belongs to the first hours of daylight. The record: 10.8 hours of sun and AQI 48.
Forum posters describe a typical August pattern of brief but heavy showers followed by plenty of sunshine in between, with temperatures generally in the 70-90F (20-33C) range and seas that can turn extremely rough during a squall. Posters report real variability - one visitor described three glorious days followed by three rainy ones, advising to enjoy the good days and bring a good book for the rest, while another found downpours were typically over within half an hour before sunshine returned. Posters consistently note that locals actually favor June through August specifically because the weather is generally fine and popular spots stay less crowded, with lower prices than peak season as a real bonus for anyone willing to accept the rain risk.
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 — May
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Ko Phi Phi 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.
BusyLong summer break in Thailand, school holidays in 2 of the markets that fill it(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).
Fair weatherKo Phi Phi's weather peaks January–March, best around February.
Best weatherFair weatherToughest weather
What's on in Ko Phi Phi in May
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.
- Season
Wet season
MonsoonRisk25 rainy days and about 263 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 May — FAQ
- Is May a good time to visit Ko Phi Phi?
- May in Ko Phi Phi: sweltering, soaked, with clean air — fine if you can take 25 rainy days. It ranks #9 of 12 months for Ko Phi Phi on SeasonMap's comfort score (67/100).
- What is the weather like in Ko Phi Phi in May?
- In May, Ko Phi Phi averages a daily high of 29.1°C and a low of 27°C, with about 263.2 mm of rain over roughly 25.4 rainy days.
- What is the air quality in Ko Phi Phi in May?
- Ko Phi Phi has a mean US Air Quality Index of about 36 in May.
Within 300 km: Khao Lak's Manta and whale shark season around 1 Feb – 5 May, and Ko Tao's Whale shark season around 15 Mar – 31 May.