Diving in the Seychelles in December

Conditions in December

So, you’re thinking about diving in Seychelles this December? Excellent choice, but let’s talk about what you can expect below the surface. December here marks the heart of the northwest monsoon season, which, for divers, means a slightly different experience compared to the calmer months. Typically, the weather can be a bit more unsettled, with increased chances of rain showers, though these are often short-lived tropical downpours. The sea state around the Inner Islands, which boast the majority of easily accessible dive sites, tends to be choppier than usual, particularly if you’re venturing further offshore. However, conditions within the sheltered bays and closer to the main islands often remain quite manageable.

Water temperatures in December are wonderfully warm, hovering comfortably around 28-30°C (82-86°F), so you won’t be needing a thick wetsuit. Visibility, though, is the aspect most affected by the monsoon. You can anticipate it to be more variable, ranging anywhere from 10 to 20 meters, and occasionally even dropping below that in certain areas where sediment might be stirred up by rougher seas or increased freshwater runoff. However, don’t let that deter you; even with reduced visibility, the vibrant marine life here knows how to put on a show. Currents can also be a bit more unpredictable and stronger in December, especially around exposed reefs and deeper channels, adding an exhilarating drift to your dives. You’ll definitely want to pay attention to your dive guide’s briefings!

What you will see

Despite the variable conditions, December in Seychelles still promises some truly incredible encounters. This month is prime time for spotting larger pelagic species. The increased plankton in the water, brought in by the changing currents, acts like a magnet for filter feeders and their predators. Keep your eyes peeled for majestic manta rays gliding through the water, especially around cleaning stations. Eagle rays are also a common sight, soaring gracefully over the reefs. For shark enthusiasts, December offers a good chance to encounter reef sharks – white-tips and grey reef sharks are regularly seen patrolling the outer reefs. You might even be lucky enough to spot hammerheads making an appearance in deeper areas. While whale sharks are primarily a September-October spectacle, there’s always a slim chance of a late season sighting.

Beyond the big stuff, the Seychelles reefs remain teeming with life. Schools of snapper and fusiliers create shimmering walls of fish, and you’ll easily spot Napoleon wrasse, groupers, and parrotfish in their colourful arrays. Macro enthusiasts will also find plenty to admire. Look closely among the corals and sandy patches for ornate ghost pipefish, various species of nudibranchs, and a plethora of tiny crustaceans. The increased nutrients in the water can also contribute to a blooming of certain coral species, making some reefs even more vibrant than usual. So, while the visibility might not always be crystal clear, the sheer volume and diversity of marine life in December more than make up for it.

Top dive sites this month

For December diving, focus on sites that offer some protection from the monsoon winds or are known for their robust ecosystems. Off Mahé, you absolutely must visit Brissare Rocks. This site, a collection of granite boulders that plummet to depths around 20 meters, is frequently buzzing with pelagics like barracuda and tuna, and you'll often see turtles and reef sharks. It’s a classic for a reason and tends to perform well even with moderate swell. Another excellent choice is Fisherman’s Cove Reef, close to Mahé’s Beau Vallon. This shallower site is perfect for experiencing vibrant reef life, with schools of fusiliers, emperors, and numerous scorpionfish, and its proximity to the coast offers a degree of shelter.

Venturing towards Praslin, Granite Blocks, near Cousin Island, is another superb option. The sheer volume of fish around these submerged granite formations is staggering. Expect to see huge schools of snappers, surgeonfish, and often patrolling reef sharks. The currents here can be zesty, which is exactly why the big fish love it. If conditions permit, particularly if you're on a liveaboard that can navigate any choppier seas, the dive sites around La Digue, such as Ave Maria, are highly recommended. These granite pinnacles are draped in soft corals and often attract larger pelagics in the stronger currents. Always check local conditions with your dive operator, as some outer sites might be inaccessible on choppier days, but these options generally offer reliable and spectacular diving throughout December.

Practical tips for your trip

Considering the warm water temperatures of 28-30°C, a 3mm shorty or even just a rash guard will be perfectly adequate for most divers. If you tend to get cold easily or plan on multiple dives a day, a full 3mm suit might offer a bit more comfort and extra protection from any potential stinging plankton. December offers fantastic diving for both advanced divers who can appreciate the drift dives and the potential for larger pelagic encounters that come with stronger currents, and beginner divers who choose more sheltered, shallower sites where the conditions are often milder. However, if you are a beginner, it's wise to discuss site choices with your dive centre to ensure you’re going to places with suitable conditions.

Liveaboard availability in December can be a mixed bag; it's shoulder season leading into the peak holiday period, so booking in advance is a smart move to secure your spot on one of the excellent vessels operating in the Seychelles. What to pack? Light, breathable clothing is a must. A good rain jacket or poncho will be appreciated for those occasional showers. Definitely bring plenty of reef-safe sunscreen, a wide-brimmed hat, and insect repellent. Be aware that while December diving is rewarding, the visibility can be unpredictable, so manage your expectations regarding crystal-clear waters. Embrace the marine life and the thrill of discovery! It’s a truly magical time to experience the vibrant underwater world of Seychelles.