SeasonMapKhao Lak weather in May
Thailand
May in Khao Lak: sweltering, soaked, with clean air — a gamble, with 27 rainy days.
#9 of 12 months in Khao Lak · #1143 of 1383 destinations to visit in May · comfort 61/100 (tier C)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Khao Lak in May
Other months in Khao Lak
Khao Lak's forum rates January among the best months of the year — hot, sunny days around 32-34°C, clear blue skies, with rain minimal. Regulars flag online forecasts as unreliable here, routinely showing thunderstorm icons that rarely translate into more than an isolated hour-long shower, and note evenings can turn cool enough for a light cardigan.
Add your own note from Khao Lak's card on the map.
Khao Lak climate normals — May
| Daytime high | 32°C / 90°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 25°C / 76°F | |
| Feels like (high) | 39°C / 102°F | |
| Sea temperature | 31°C / 88°F | ♨️ bath-warm |
| Rainfall | 308 mm / 12.1 in | ⛈ soaked |
| Rainy days | 27 days | |
| Humidity | 86% | 💦 very humid |
| Dew point | 25°C / 78°F | |
| Sunshine | 9 h/day | |
| Daylight | 12.5 h | |
| Wind | 15 km/h / 10 mph | |
| Air quality (US AQI) | 33 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Khao Lak 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 Khao Lak'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 weatherKhao Lak's weather peaks January–March, best around February.
Best weatherFair weatherToughest weather
What's on in Khao Lak in May
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Nature
Manta and whale shark season
1 Feb – 5 May · usuallyDive seasonThe tail of the dive season at Richelieu Rock and Koh Bon, when the plankton is up and the big animals follow it. Never a sure thing, and the liveaboards sell those weeks first.
- Season
Southwest monsoon and red flags
15 May – 31 Oct · usuallyRiskRip currents on this stretch of coast are the real risk, and the red flags go up for weeks at a time. Half the beachfront shuts and the other half drops its rates to nothing.
- Closure
Similan and Surin islands closed
16 May – 14 OctThe park authority shuts both island groups for the monsoon every year, which takes the liveaboards and the day boats out with them. Khao Lak's dive shops largely close for the season. Source ↗
- Season
Wet season
MonsoonRisk27 rainy days and about 308 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 Khao Lak — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Khao Lak?
Khao Lak in May — FAQ
- Is May a good time to visit Khao Lak?
- May in Khao Lak: sweltering, soaked, with clean air — a gamble, with 27 rainy days. It ranks #9 of 12 months for Khao Lak on SeasonMap's comfort score (61/100).
- What is the weather like in Khao Lak in May?
- In May, Khao Lak averages a daily high of 32.2°C and a low of 24.7°C, with about 307.9 mm of rain over roughly 26.7 rainy days.
- What is the air quality in Khao Lak in May?
- Khao Lak has a mean US Air Quality Index of about 33 in May.
Other months in Khao Lak
Compare Khao Lak in May
Warmer or cooler than Khao Lak in May
Similar destinations in Southeast Asia — May
Within 300 km: Ko Tao's Whale shark season around 15 Mar – 31 May, and Ko Samui's Gulf dry season around 15 Jan – 31 Aug.