There are two seasons in Khao Lak, the Dry Season which runs from November to April and the Wet Season from May to October. Even in the Dry Season though you will get rain, particularly at the beginning and end, sometimes heavy but mostly of short duration. On the other hand there will be plenty of sunshine and always heat in the Wet Season. When rain is about the humidity can be quite high. Most visitors come in the Dry Season with Christmas and New Year being particularly popular and most expensive in terms of accommodation rates. In the Wet Season many restaurants, bars and shops close but an increasing number now remain open as Khao Lak tries to make itself a year round destination. Beach conditions are usually difficult in this period and sea bathing is usually not advised. Tours to the nearby Similan and Surin Islands also do not take place between May and October because of ocean conditions. Accommodation rates, though, fall to often less than half making Khao Lak an excellent choice for those who prefer more peace and quiet and to take in the natural beauty of the area and neighbouring National Parks. December, January and February are perhaps the most temperate of months to visit. Unfortunately there is no meteorological station based directly on Khao Lak, so reference to weather forecasts is usually base on Thai Muang to the South or Takua Pa to the North. Very often though reference to forecasts based on these areas shows conditions very different to those in Khao Lak. Good websites for weather information though can be found at http://www.weather.com/outlook/travel... for Thai Muang , http://www.accuweather.com/world-fore... for Takua Pa and http://www.tmd.go.th/en/province.php?... for various areas of Southern Thailand Other good sites are: http://www.holiday-weather.com/khao_l...  http://magicseaweed.com/Khao-Lak-Surf... http://www2.tmd.go.th/program/nwp_pro... http://weather-and-climate.info/avera... http://www.windguru.cz/int/index.php?... (Great for off shore weather!) http://www.weatheronline.co.uk/Thaila...