Diving in Bali in December

Conditions in December

So, you're thinking about diving in Bali in December? Let's get straight to the point: yes, it’s the start of the rainy season. But before you picture a month-long washout, let’s talk about what that really means in the tropics. You can expect warm, humid days with the sun making a regular appearance, often punctuated by a short, intense downpour in the afternoon or overnight. These bursts of rain clear the air, make the lush landscapes even greener, and rarely disrupt an entire day of diving. Most dive operators are well-accustomed to this pattern, often scheduling two morning dives to get you back before any afternoon showers roll in.

In the water, conditions are generally excellent, though variable. Water temperatures are a balmy 27-29°C (80-84°F) across most of the island's dive sites. The big exception is the Nusa Penida area, where currents sweeping up from the deep can bring breathtaking (and chilly) thermoclines, with temperatures sometimes dropping to a brisk 20-24°C (68-75°F). Visibility depends heavily on your location and the recent weather. Following a heavy rain, runoff can reduce visibility on shore dives, especially along the northeast coast like Tulamben, bringing it down to 10-15 meters. However, out at the islands or on a clear day, you can still easily enjoy a spectacular 20-30 meters of vis.

Currents are a defining feature of Balinese diving, and December is no exception. The channels between Bali and its offshore islands are a funnel for massive amounts of water, creating some of the world's most exhilarating drift dives. While some sites are gentle enough for beginners, others, particularly around Nusa Penida and the Gili islands off Padang Bai, can be powerful and demand respect. This is 'liquid adrenalin' diving and a huge part of the attraction, but it's crucial to dive with reputable guides who understand the tides and can put you in the right place at the right time.

What you will see

December in Bali is a fantastic time for big animal encounters, with one particular superstar stealing the show: the manta ray. The plankton-rich waters, stirred up by the seasonal shift, draw these gentle giants in numbers. Head to the cleaning stations around Nusa Penida, like the world-famous Manta Point, where you have an exceptionally high chance of watching them glide effortlessly overhead as they get cleaned by wrasse. While it’s the wet season, the abundance of food can lead to incredible feeding behaviour, with trains of mantas swooping and barrel-rolling through the water. While the main season for the enigmatic Mola Mola (oceanic sunfish) is over, a surprise visit in the cooler deep waters of Crystal Bay is not impossible, but consider it a very lucky bonus rather than an expectation.

Beyond the mantas, you’ll find the reefs teeming with life. Whitetip and blacktip reef sharks patrol the walls and slopes, especially around sites like Gili Tepekong and Menjangan Island. Keep an eye under ledges and table corals for the beautifully camouflaged wobbegong shark, a real treat for observant divers. Turtles are a common and welcome sight at many sites, munching lazily on sponges or cruising by in the blue. The currents also bring in schooling fish like fusiliers, surgeonfish, and massive schools of red-toothed triggerfish that move like a single, shimmering cloud.

But to think Bali is only about pelagics would be a huge mistake. The island is a world-class macro and muck diving destination, and December is a prime time for it. Dive sites in Tulamben, Amed, and Padang Bai are critter havens. On the volcanic black sand, your guide can point out wonders you’d never find on your own: pygmy seahorses hiding in gorgonian fans, flamboyant cuttlefish, harlequin shrimp, countless species of colourful nudibranchs, and bizarre-looking frogfish. The legendary USAT Liberty Wreck is practically an underwater city for macro life, with every square inch colonised by something weird and wonderful. It's a photographer's dream, offering endless subjects regardless of the weather topside.

Top dive sites this month

To make the most of December, you need to pick your spots wisely. First on your list should be the islands of **Nusa Penida and Nusa Lembongan**. Despite the potential for some surface chop on the crossing, the payoff is huge. **Manta Point** is a must-do for its reliable manta congregations. For thrilling drift dives over some of the healthiest coral reefs on the planet, head to sites like **SD Point** and **Mangrove**. The currents here carry you along vibrant slopes packed with fish life. Just be ready for those thermoclines and listen to your guide's briefing carefully.

Next, head to the northeast coast to explore **Tulamben and Amed**. This area is legendary, and rightly so. The **USAT Liberty Wreck** in Tulamben is one of the world's most accessible and impressive wrecks, suitable for all levels. You can spend days exploring its coral-encrusted structure. Amed offers a fantastic variety, from the beautiful wall and coral gardens of **Jemeluk Bay** to dedicated muck diving sites. While shore-entry visibility can be affected by rain, it’s often a small price to pay for the incredible biodiversity. Further south, **Padang Bai** is another excellent hub. Dive the famous **Jetty** for an unforgettable muck dive or enjoy the easy, fish-filled conditions at **Blue Lagoon**. For advanced divers seeking a thrill, the offshore islands of **Gili Tepekong** and **Gili Mimpang** offer powerful currents and the chance to see sharks and large schools of fish, but these sites are condition-dependent and require experience.

Practical tips for your trip

When it comes to gear, your wetsuit choice is important. While the water is mostly warm, a 5mm full suit is highly recommended if you plan to dive Nusa Penida. The sudden temperature drops there can be significant, and being cold can cut a spectacular dive short. For the warmer, more stable temperatures in Tulamben or Amed, a 3mm suit is usually sufficient. December is a fantastic month for divers of all levels; beginners can stick to sheltered sites like Blue Lagoon or the shallow parts of the Liberty Wreck, while advanced divers can get their adrenaline fix on the exhilarating drifts around Penida. Flexibility is your greatest asset this month, if conditions are rough in one area, a great operator will have an excellent plan B.

Though not the absolute peak season, December falls over the Christmas and New Year holidays, so it's a popular time to travel. We strongly advise booking your dive packages or liveaboard spot in advance to avoid disappointment. On land, pack a lightweight rain jacket and a dry bag for boat trips to protect your camera and phone. Quick-drying clothes are far more practical than cotton. And don't forget your logbook and camera! Whether you favour a wide-angle lens for the mantas and wrecks or a macro lens for the tiny critters, Bali in December will fill your memory cards and logbook pages with unforgettable moments.