What Is the Best Phuket Diving Season?
One of the great things about scuba diving in Phuket is that you can dive here throughout the year.
Warm tropical water, a wide variety of dive sites and year-round local diving make Phuket one of Thailand’s most established scuba diving destinations. However, conditions and available destinations change with the seasons, so the best time for diving in Phuket depends on what you want from your trip.
For some divers, the best Phuket diving season means calm seas, offshore liveaboards and access to the Similan Islands. For others, quieter dive boats, fewer tourists and lower accommodation prices make the green season a better choice.
So, when is the best time to go scuba diving in Phuket?
It depends on:
- Your diving experience
- The type of diving you want to do
- The dive sites you hope to visit
- Your tolerance for rougher sea conditions
- Your budget
- Whether you prefer peak season or a quieter Phuket
Let’s look at what you can realistically expect from Phuket diving throughout the year.
Can You Scuba Dive in Phuket All Year?
Yes. Scuba diving in Phuket operates year-round, although not every dive site or destination is available throughout the entire year.
Water temperatures around Phuket generally remain between approximately 27°C and 30°C, making diving comfortable in every season. Most divers are comfortable in a 3mm wetsuit or similar exposure protection, although individual preferences naturally vary.
Throughout the year, Phuket offers access to a mixture of:
- Local day-trip diving
- Beginner-friendly dive sites
- PADI courses and training
- Advanced diving
- Reef diving
- Wreck diving
- Deep and specialty diving
The biggest seasonal difference isn’t whether you can dive, it’s where you can dive and what the surface conditions may be like getting there.
Local diving continues throughout the year, while more remote destinations such as the Similan Islands are seasonal.
Phuket High Season Diving: November to April
For most visitors, November through April is considered the main Phuket diving season.
This period overlaps with Phuket’s dry season and generally brings more settled weather and calmer sea conditions along Thailand’s Andaman coast.
Divers can typically expect:
- Calmer seas
- Generally more stable weather
- Good underwater visibility
- Greater choice of dive destinations
- Similan Islands and northern liveaboard trips
- Easier boat journeys
- Phuket’s busiest tourism period
Visibility varies considerably between dive sites and even from one day to the next, but 15–30 metres can be possible in good conditions.
Currents, tides, plankton, weather and the individual dive site all influence visibility, so no responsible dive operator should guarantee crystal-clear water simply because you’re visiting during high season.
Late December through January is generally one of Phuket’s busiest tourism periods, so it’s worth booking popular diving trips and PADI courses in advance.
Why Do Many Divers Prefer Phuket’s High Season?
For many divers, the main advantage is simply having more options.
Calmer sea conditions generally make longer boat journeys more comfortable and allow dive operators access to destinations that aren’t available during the southwest monsoon.
If you’re planning several days of scuba diving in Phuket, high season gives you the opportunity to mix local day trips with more adventurous offshore diving.
Depending on your experience and itinerary, that could include diving around:
- Racha Yai
- Racha Noi
- Phi Phi Islands
- Shark Point
- Anemone Reef
- King Cruiser Wreck
- Koh Doc Mai
High season also opens the door to liveaboard diving further north, including the Similan Islands, Koh Bon, Koh Tachai and Richelieu Rock.
For experienced divers wanting the widest possible choice of Phuket diving, November through April is difficult to beat.
When Is the Similan Islands Diving Season?
One of the biggest reasons divers visit Phuket during high season is access to the Similan Islands Marine One of the biggest reasons divers visit Phuket during the high season is access to the Similan Islands and surrounding northern Andaman dive sites.
The Similan Islands National Park normally operates seasonally, generally from around mid-October until mid-May, although exact opening and closing dates are controlled by Thailand’s Department of National Parks and can change.
During the closed season, diving within the national park isn’t permitted.
When open, the Similan Islands region offers a very different style of diving from Phuket’s local day-trip sites.
Divers can encounter:
- Huge underwater granite formations
- Clear blue water
- Coral reefs
- Deep pinnacles
- Large schools of fish
- Reef sharks
- Large pelagic species
Further north, Koh Bon, Koh Tachai and Richelieu Rock are highlights of many liveaboard itineraries.
Richelieu Rock in particular has earned an international reputation for its marine biodiversity and is one of Thailand’s best-known dive sites.
For divers specifically planning a Similan Islands or northern Andaman liveaboard, the Phuket high season is the time to visit.
When Is the Best Time to See Manta Rays and Whale Sharks?
This is one of the questions we hear regularly, and the most accurate answer is that there are no guarantees.
Manta rays and whale sharks are wild animals. They don’t check Phuket’s tourism calendar before turning up.
Manta ray encounters are most strongly associated with offshore sites such as Koh Bon, while whale sharks are occasionally encountered at sites including Richelieu Rock and other locations throughout the Andaman Sea.
Because these more remote northern sites are primarily accessible during the Similan and liveaboard season, most opportunities to encounter these larger pelagic species naturally occur during the high-season months.
But it’s important to keep expectations realistic.
You could spend a week diving and not see either species, while another diver might get extraordinarily lucky on their first trip.
That’s diving.
The better approach is to choose great dive sites for the overall experience and treat a manta ray or whale shark encounter as a very welcome bonus.
Phuket Green Season Diving: May to October
From approximately May through October, Phuket enters the southwest monsoon, commonly referred to locally as the green season.
This is also frequently described as Phuket’s “low season”, although that term can give divers the wrong impression.
Diving in Phuket doesn’t stop during the green season.
Local diving continues throughout the year, and PADI courses, introductory experiences and recreational day trips still operate regularly.
What changes is the weather and the range of suitable dive sites.
The southwest monsoon can bring stronger winds, larger swells and more variable sea conditions, so operators need to pay closer attention to weather forecasts and sometimes adjust planned destinations.
What Are Diving Conditions Like During Phuket’s Monsoon Season?
Green-season weather can be more unpredictable than during the dry season.
Divers may experience:
- Rougher surface conditions
- Increased swell
- Tropical rain showers
- Variable underwater visibility
- Stronger currents at some locations
- Changes to planned dive destinations
One important point is that rain doesn’t automatically mean bad diving.
A rainy morning in Phuket can still produce a perfectly enjoyable day underwater. Wind direction, wave height, currents and local sea conditions are often more important to dive planning than whether rain happens to be falling.
Weather can also change remarkably quickly in the tropics. A wet morning doesn’t necessarily mean a wet afternoon — and vice versa.
During this period, responsible Phuket diving operators may change destinations when the original itinerary isn’t suitable for the expected conditions.
Flexibility is therefore particularly important when visiting during the green season.
Where Do You Dive in Phuket During the Green Season?
During the southwest monsoon, diving tends to focus more heavily on the Racha Islands, particularly Racha Yai and Racha Noi.
Their geography provides a selection of dive sites that can offer protection from prevailing weather and sea conditions, making the islands an important part of Phuket’s year-round diving.
Depending on the day’s conditions, divers can enjoy:
- Tropical reef diving
- Sandy-bottom training areas
- Coral formations
- Schools of reef fish
- Moray eels
- Stingrays
- Barracuda
- Occasional larger marine life
Other local destinations may also be available when conditions allow.
The key difference during this period is flexibility. Rather than choosing a trip purely because you want to visit one particular dive site, it can be better to follow the recommendations of an experienced local operator based on current conditions.
Is Low Season a Good Time for Scuba Diving in Phuket?
It certainly can be.
Although the high season provides a greater choice of dive destinations, the green season has some advantages of its own.
These can include:
- Fewer tourists
- Quieter dive boats
- Less crowded dive sites
- Better-value accommodation
- More hotel availability
- A generally more relaxed Phuket
For travellers who aren’t focused on the Similan Islands and don’t mind the possibility of rougher boat journeys or itinerary changes, green-season scuba diving in Phuket can offer excellent value.
There can still be some beautiful diving days during this period.
You just need to arrive with realistic expectations and a little flexibility.
What Is the Best Phuket Diving Season for Beginners?
For beginners, Phuket can be a good place to learn to dive throughout the year.
The Racha Islands are particularly useful for diver training because they offer multiple sites and conditions suitable for different levels of experience.
Depending on the day and chosen dive site, conditions can include:
- Protected bays
- Sandy-bottom training areas
- Warm tropical water
- Manageable depths
- Good opportunities for new divers to build confidence
This makes the area popular for:
- PADI Discover Scuba Diving
- PADI Open Water Diver courses
- Refresher programs
- Beginner recreational diving
High season will generally provide more consistent surface conditions, which can make the overall experience more comfortable for nervous beginners or anyone concerned about seasickness.
However, plenty of divers successfully learn to dive in Phuket during the green season as well.
A good dive centre will select training locations according to the student’s ability and the conditions expected on the day rather than forcing a predetermined dive site regardless of the weather.
What Is the Best Month for Diving in Phuket?
There isn’t one single month that can be guaranteed as the “best”.
If your priority is the widest choice of dive sites and generally settled conditions, the period from approximately December through April is a strong choice.
If you specifically want to visit the Similan Islands, Koh Bon or Richelieu Rock, you need to travel while the marine parks and seasonal liveaboard routes are operating.
If your priorities are local Phuket diving, fewer tourists and better-value accommodation, months within the green season can be an excellent alternative.
It’s therefore better to choose your travel period around the diving experience you want rather than searching for one supposedly perfect month.
Phuket Diving Season at a Glance
November to April May Be Best If You Want:
- Generally calmer seas
- More predictable weather
- The widest variety of Phuket dive sites
- Similan Islands liveaboards
- Access to Koh Bon and Richelieu Rock
- Better opportunities to explore offshore destinations
The trade-off is that Phuket is busier and accommodation and travel prices can be higher, particularly around Christmas and New Year.
May to October May Be Best If You Want:
- Fewer tourists
- Quieter dive boats
- Better-value accommodation
- A more relaxed atmosphere
- Local day-trip diving
- PADI courses and training
The trade-off is more variable weather, potentially rougher sea conditions and a reduced choice of dive destinations.
So, What Is the Best Phuket Diving Season?
For the widest variety of diving and the most consistently favourable sea conditions, November through April is generally the best Phuket diving season.
It’s the period when local diving is complemented by seasonal access to the Similan Islands and the northern Andaman Sea, giving experienced divers the greatest choice.
But that doesn’t mean you should avoid Phuket from May to October.
If your plans involve PADI training, local day trips or simply getting underwater while you’re visiting Thailand, scuba diving in Phuket remains possible throughout the green season.
You may have fewer destinations to choose from and conditions can be more variable, but quieter boats, fewer tourists and lower travel costs can make it an attractive time to visit.
Ultimately, the best time for diving in Phuket depends on what matters most to you.
If you want the widest choice of dive sites, visit during high season. If you prefer a quieter Phuket and don’t mind being flexible with the weather, green season has plenty going for it.
Either way, the water is warm, and that’s already a decent start.
