Khao Lak sits on Thailand’s Andaman coast in Phang Nga province, just north of Phuket, and its weather follows the classic tropical monsoon rhythm of the region. Temperatures stay warm all year — usually between 25°C and 33°C — so the real question isn’t whether it will be hot, but how much rain and wind to expect, and how calm the sea will be for island trips. This guide breaks down Khao Lak’s weather month by month and matches each season to the experiences that work best, so you can plan a trip that lands on the right days.
The Andaman coast has two clear seasons. The high (dry) season runs roughly November to April: warm days, low humidity by tropical standards, calm seas, and the long stretch of blue-sky weather that makes Khao Lak a winter-sun favourite. The green (monsoon) season runs roughly May to October: warmer water, lush jungle, dramatic skies and short heavy downpours, usually in the afternoon rather than all day. Rain rarely falls non-stop — even in the wettest months you often get sunny mornings — but the Andaman Sea gets choppier, which is what closes the offshore islands for part of the year.
| Month | Typical high / low | Rainfall | Sea & conditions |
|---|---|---|---|
| January | 33°C / 23°C | Very low | Calm, clear — peak dry season |
| February | 33°C / 24°C | Very low | Calm, excellent visibility |
| March | 34°C / 25°C | Low | Calm, hot, hazier light |
| April | 34°C / 26°C | Rising | Hottest month; seas still mostly calm |
| May | 32°C / 25°C | Increasing | Monsoon arrives; sea gets choppier |
| June | 31°C / 25°C | Moderate–high | Green season; afternoon showers |
| July | 31°C / 25°C | High | Lush jungle; bigger Andaman swell |
| August | 31°C / 25°C | High | Wet but with bright spells |
| September | 31°C / 24°C | Wettest month | Heaviest rain; strongest seas |
| October | 31°C / 24°C | High, easing late | Transition; islands reopen mid-month |
| November | 32°C / 24°C | Easing | Drying out; seas settling |
| December | 32°C / 23°C | Low | Calm, fresh, busy — high season |
Figures are typical averages for the Khao Lak / Phang Nga coast and will vary year to year. The single most useful takeaway: November to April is dry and calm, May to October is green and wetter.
If you want guaranteed sun, flat seas and every tour running, this is the window. December through February are the most comfortable months — warm rather than scorching, with cooler evenings and the clearest underwater visibility of the year. March and April turn up the heat, and April is the hottest month of all, but the sea stays calm and the islands stay open. This is also the busiest and priciest stretch, so book popular tours and transfers ahead.
Don’t write off the monsoon. Rain usually comes in short, heavy bursts — often a dramatic afternoon downpour that clears as fast as it arrives — leaving plenty of dry hours for exploring. The jungle is at its greenest, waterfalls run full, prices drop and the beaches are blissfully uncrowded. The trade-off is the sea: the Andaman swell builds through the wet months and the offshore islands close for safety. The mainland, however, is wide open and arguably at its most beautiful.
Some of Khao Lak’s signature trips are seasonal — not because of price, but because of nature and Thai marine-park rules. Here’s exactly when each runs.
If your trip falls between May and October, you’ve simply got a different — not lesser — menu. The Similans and Surins may be closed, but plenty of the best days out keep running:
As Khao Lak locals, our honest advice: there’s no truly bad time to visit — just different trips for different months. Tell us when you’re coming and we’ll steer you to the experiences that will be at their best while you’re here.
Khao Lak Land Discovery Co., Ltd. 21/5 Moo7 Khuk Khak, Phang Nga 82220 TAT 41/00132 Thailand-licensed tour operator
