Diving in Thailand in July is often misunderstood. Many travelers assume that at this time of year diving in the Andaman is not possible. However, this is not entirely true. While some areas close, the South Andaman remains active and rewarding. In fact, diving in Thailand in July can be one of the most exciting seasons.
This guide focuses on the South Andaman region, where diving continues throughout July. You will learn about conditions, marine life, and the best dive sites. If you are planning a summer dive trip, this region deserves serious attention.
Understanding July Conditions in the South Andaman
July is considered an early part of the southwest monsoon. As a result, the Andaman Sea does experience some more wind and rain. However, rain usually comes in short bursts rather than all day, with the sun returning shortly after (September is when the heavy rains are expected).
Conditions in the South Andaman are different to that of the north at this time of year, due to being sheltered somewhat from the ocean side of Phuket to the west. This ocean exposure is a factor in why the Similan & Surin National parks close at this time of of year. Because of this, diving in Thailand in July remains reliable in the south.
Water temperatures stay warm at around 28–29°C. Visibility can be up to 25 meters, depending on plankton levels, and marine life activity can be excellent.
What Is the South Andaman?
The South Andaman, at this time of year, includes the dive areas around Phuket, Phi Phi Islands, and the Racha Islands.
During the busier months of the year, the South Andaman diving areas can also include Koh Lanta and Koh Lipe further to the south. For this article we will be referring to the areas around Phuket.
Best South Andaman Dive Sites in July
Phi Phi Islands
Phi Phi offers limestone walls, shallow reefs, and swim-throughs. Marine life includes leopard sharks, blacktip reef sharks, and schools of snapper.
Because July is quieter overall in Phuket, dives can feel more relaxed. Therefore, underwater encounters can often be more natural and less crowded.
Shark Point
Shark Point is one of the highlights of diving in Thailand in July. Increased plankton attracts marine life, including leopard sharks. Biodiversity can be high, making for an exciting experience.
Soft corals thrive during this season. Consequently, the reef appears colorful and alive.
King Cruiser Wreck
The King Cruiser Wreck is another popular South Andaman site. This artificial reef attracts barracudas, trevallies, and lionfish. It is a deeper dive site, and may have more challenging currents, at times.
However, experienced guides ensure safe dives. As a result, the wreck remains a huge favourite and has an interesting history.
To read more on the history of the King Cruiser Wreck visit – King Cruiser Wreck: Phuket’s Deep Wreck Dive Adventure
Racha Yai and Racha Noi
The Racha Islands are known for some epically clear water. In July, they are often chosen when conditions allow. Racha Noi, in particular, can offer encounters with larger pelagic species.
These islands are excellent options for divers to experience the joys of the Thai seas.
Marine Life Peaks in July
One major advantage of diving in Thailand in July is marine life. Plankton blooms attract bigger fish. As a result, divers often see more dense schools and active predators.
Leopard sharks, reef sharks, moray eels, and cuttlefish are common. Manta rays are rare but possible at deeper sites. Although visibility may be a little tighter at times, life underwater becomes more dramatic.
Photographers often enjoy July dives because behavior is more dynamic, giving South Andaman dives an energetic and raw feel.
Why Dive the South Andaman in July?
Diving in Thailand in July offers unique benefits in the South Andaman. First, dive sites are often quieter. Boats regularly carry fewer divers, which can improve the overall experience.
Second, prices are generally lower. Accommodation and dive packages are often run at discount over high season. Therefore, longer dive holidays become more affordable.
Finally, reefs benefit from nutrient-rich water. Soft corals bloom, and fish populations can increase. This seasonal change creates a different underwater experience.
Challenges and How Operators Manage Them
Yes, July can be wetter, and seas can be a little choppy at points, leading to some itinerary adaptations to find the best conditions. Experienced South Andaman operators with do this based on the daily forecasts, to find the best that is out that at this time.
Sites are selected according to shelter and currents. Therefore, dives remain safe even when conditions shift. Flexibility is essential, and can often lead to better site choices and action.
Is the South Andaman Suitable for Beginners?
Yes, beginners can still enjoy diving in Thailand in July in the South Andaman. Shallow reefs around Phi Phi and Racha Yai are suitable for training dives.
However, beginners should be comfortable in mild currents. Good dive centers adjust depth and location accordingly. As a result, new divers still gain confidence and skills.
Advanced sites remain optional, ensuring safety for all experience levels.
If you are already Open Water certified and have 10+ dives already inder your belt, why not come and join our ‘Perfect Long Weekend’ diving liveaboard in July? – 3 night diving liveaboard from Phuket
Final Thoughts
Diving in Thailand in July is about choosing the right region. The South Andaman proves that excellent diving continues year-round.
With fewer crowds, active marine life, and professional operators, this region stands out. While conditions change daily, flexibility leads to rewarding dives.
If you are travelling to Thailand in July, the South Andaman is not a backup plan. It is a smart and exciting choice.
Frequently Asked Questions
Is diving in the South Andaman safe in July?
Yes. Diving is conducted daily by experienced operators who assess weather and sea conditions and adjust sites accordingly.
Are the Similan Islands open in July?
No. The Similan Islands are typically closed during this period, but many South Andaman dive sites around Phuket remain open and active.
What marine life is common in July?
July diving around Phuket commonly features leopard sharks resting on sandy bottoms, blacktip and whitetip reef sharks, turtles, eagle rays, large schools of reef fish such as snapper and fusiliers, and rich macro life including nudibranchs and shrimp. Soft corals and sea fans are often especially vibrant at this time of year.
Is visibility bad in July?
Visibility can vary depending on weather and location, as it does year-round, but nutrient-rich conditions often result in increased marine life activity.
Can beginners dive in the South Andaman in July?
Yes. Many dive sites are suitable for beginners, provided dives are conducted with proper guidance and appropriate site selection. Although, to join one of our liveaboards you will need to be at minimum Open Water certified with 10 logged dives.
