When choosing a dive site, wind and sea state plays an important role. In Phuket we have 2 main seasons with different wind directions:
The dry season begins in December and usually lasts until March. The northeast monsoon draws cool, dry air from the Asian continent resulting in a slight drop in temperature. This is the high season for tourism in Phuket, when the climate is at its best, characterized by gentle breezes, calm seas and clear blue skies. It is also the coolest time of year.
The transitional periods last a month or so. During these periods the weather is often hard to predict. The period before the rainy season, around April – May, is the hottest time of year. There may be a lot of rain or none at all. The October – November transition is cooler and usually quite wet.
The rainy season begins in June and lasts until October. When people talk about the monsoon season, they are referring to the southwest monsoon period, which is the rainy season. The strong winds bring warm moist air from the Indian Ocean and plenty of rain. This is Phuket’s low season.
How is the wind affecting scuba diving?
With west or east wind the boat is rolling when traveling to Racha Islands and pitching when travelling to all other dive sites. When the boat pitch passengers will feel more comfortable during the ride.
In dry season with wind from east, waves can’t build up that high as main land is not that far away. Sea state is mostly between calm and slight, rarely moderate and more. In rainy season when wind is blowing from west and south west waves can build up quite high as African continent is far. Therefore wind has time to build waves. What makes Surfers happy at the west coast beaches (Karon, Kata, Patong) is for scuba diving in Phuket a limiting factor. Unpredictable thundershowers in rainy season are the biggest thread for boats. Sea state there can be rough. We operate up to moderate sea state. Forecasts are not that accurate in the tropics. Therefore the final decision which dive site will be dived can only be taken on short notice, sometimes in the morning of the trip. But when we are in doubt we cancel a dive trip free of charge for your comfort and safety.