Diving in the Seychelles in October

Conditions in October

October in the Seychelles marks a magical transition, positioning itself perfectly between the two monsoons. You're catching the tail end of the southeast trade winds, but before the northwest winds really kick in. This means you can generally expect some of the calmest sea states of the year, making for comfortable boat rides and easy entries and exits from your liveaboard. While a stray squall isn't entirely out of the question, the weather tends to be predominantly sunny with light breezes. Air temperatures hover around a pleasant 28°C to 30°C (82°F to 86°F), perfect for topside relaxation between dives. Importantly, the water temperature is consistently warm and inviting, usually a balmy 28°C to 29°C (82°F to 84°F).

Visibility during October is often outstanding, reaching easily 20 to 30 meters, and sometimes even pushing past 40 meters on a good day. The reduced wind means less surface chop stirring up sediment, allowing for clearer water. Currents are generally mild to moderate, especially around the inner islands, making it suitable for a wide range of diving experiences. You might encounter a bit more current around offshore pinnacles or during specific tidal movements, but for the most part, it's a very forgiving month. This period is truly a sweet spot for Seychelles diving, offering a taste of the best conditions before the potentially choppier seas that can arrive with the full swing of the northwest monsoon.

What you will see

October is a thrilling time to dive in the Seychelles, particularly if you have a penchant for pelagics. As the water temperatures remain warm and the plankton blooms shift, it’s a prime month for encountering larger marine life. You stand an excellent chance of spotting various species of reef sharks, including grey reef sharks, whitetip reef sharks, and sometimes even nurse sharks resting on the sandy bottom. Keep your eyes peeled for schools of barracuda, trevally, and snapper congregating around pinnacles and wrecks. This transitional period also increases the likelihood of encountering oceanic white tip sharks in deeper, offshore locations. If you're lucky, you might even catch a glimpse of a whale shark, as October falls within their seasonal migration through these waters, though they are never guaranteed.

Beyond the impressive pelagics, the vibrant coral reefs are teeming with a kaleidoscope of smaller life. Expect to see an abundance of tropical fish such as parrotfish, angelfish, butterflyfish, and various species of groupers. The healthy coral ecosystems, particularly around the granite islands, provide shelter for an incredible diversity of macro life. Look closely for nudibranchs, flatworms, moray eels peeking out from crevices, and cleaner shrimp. Octopus and cuttlefish are also common sightings. Green sea turtles and hawksbill turtles are year-round residents and are frequently encountered gracefully gliding over the reefs or resting on ledges. The combination of clear water and active marine life makes for fantastic photographic opportunities, capturing both wide-angle reefscapes and intricate macro shots.

Top dive sites this month

Given the calm conditions of October, you have excellent access to a wide array of dive sites, from the sheltered inner islands to the more exposed outer atolls. One must-visit is the Ennerdale Wreck, located off Mahé. This 12,000-ton British tanker, deliberately scuttled in 1970, lies at a depth of 30 meters and is now a thriving artificial reef. It’s teeming with barracuda, trevally, and large groupers, often with reef sharks patrolling its perimeter. The calm seas in October make this deeper dive particularly accessible and enjoyable.

For vibrant reef diving and excellent pelagic encounters, head to Shark Bank, also near Mahé. This underwater pinnacle attracts an impressive array of life, including grey reef sharks, eagle rays, and schooling fish. The currents here can be more noticeable, but October's typically milder conditions make it a rewarding drift dive. Further afield, if your liveaboard ventures to the outer islands, sites around Desroches Atoll offer incredible pristine reefs and a high chance of spotting larger pelagics, including occasional manta rays and even whale sharks, given their migratory patterns in October. Meanwhile, sites like Ave Maria near Praslin provide spectacular granite formations often covered in soft corals, supporting a diverse ecosystem perfect for photography.

Practical tips for your trip

Considering the consistently warm water temperatures of 28°C to 29°C (82°F to 84°F) in October, a 3mm shorty or full-length wetsuit will be more than sufficient to keep you comfortable. Some divers might even prefer just a rash guard for thermal protection, but a thin wetsuit offers better protection against any accidental coral scrapes or stings. This month is generally suitable for all levels of divers. The usually calm seas and good visibility make it ideal for beginners gaining confidence, while the potential for pelagic encounters and dive sites with mild currents offers plenty of excitement for advanced divers.

Liveaboard availability can start to get busy in October as word gets out about these favorable conditions, so it's always wise to book your trip well in advance – especially if you have specific dates or a particular liveaboard in mind. Remember to pack light, breathable clothing for topside excursions, and don't forget high-factor reef-safe sunscreen, a wide-brimmed hat, and polarized sunglasses. A good camera with appropriate underwater housing is a must to capture the breathtaking marine life. Be aware that while Seychelles is generally very safe, you should always respect local customs and marine regulations, ensuring you contribute to the preservation of this incredible underwater paradise.