Khao Lak weather is cosy all year round. As in the other provinces in southern Thailand, there are three periods through the year that define the climate in Khao Lak and Phang Nga Province: high season is from November to March; hot season is from April to May; and low season is from June to October.
Despite the fact that Phang Nga Province is, to the delight of the local farmers, the wettest province in southern Thailand, you can expect clement weather most of the time outside the monsoon (low) season. Temperatures are also, in accordance with the weather, pretty warm all year round. Please note that the most notable attractions of the area – the Similan and Surin Islands – are closed from April to November, so it is best to plan your holiday during high season if you want to make the most of your trip by visiting these superb islands.
If really hot weather is not your style, the cool north-east monsoon season, from November through March, is the least humid and the cool breezes keep things comfortable. The sky is blue, the sea is turquoise and the weather is almost always perfect for a holiday. The average temperature is around 24°C to 32°C (75°F to 89°F) at this time.
For sun lovers, the hottest time is from April through May, with temperatures ranging from 27°C to 36°C (80°F to 95°F). Brief but heavy thundery showers offering welcome relief from the temperatures, though they mostly occur only in the evenings and at night. June, July and August is less hot and, though the weather is generally fine, there can be heavy showers during the day, with plenty of sunshine between downpours.
During September and October, the south-west monsoon sets in, but even then there can be long intervals of sunshine between the heavy showers. It’s the best time of the year to hike (with a raincoat at hand) in the rainforest to see the many waterfalls located in the area at their best (and fullest). Temperatures range between 20°C to 30°C (70°F and 86°F).