Ocean temperature is around 28 degrees celsius all year and has an air temperature average of 28 degrees celsius. November to April is Phuket’s busiest tourist time & prices are generally higher. This however is the time to come if you want perfect weather everyday & flat clear aqua water, perfect for Stand Up Paddling & snorkelling (Our pick is November or December as it’s not too busy yet and cooler) March to May are the hottest months with April 13th a good time to visit and celebrate Thai New Year, where the whole island celebrates with street water festivities. May to October is surf season, the Island is quieter, cheaper & even though its rainy season you still get many beautiful days. Waves are not world class but great for beginners, intermediates or families.