May is one of the best months for Gili Tangkong — the snorkel reef at near-peak quality with low crowds and reliable boats.
May is excellent for Gili Tangkong, the best-snorkeling island of the four Secret Gilis. Dry season has begun with calm seas and good underwater visibility on the north-side drop-off reef. Crowds are low and many tour groups still skip Tangkong — insist with your boat captain that he includes it. Reliable big-fish sightings (Spanish mackerel, schools of fusiliers, occasional reef sharks) make it the snorkel highlight of the circuit.
# Gili Tangkong in May: The Snorkel Reef
Gili Tangkong is the snorkeling island of the four Secret Gilis off southwest Lombok. While Kedis is for photos, Sudak for lunch, and Nanggu for swimming, Tangkong is where the actual snorkeling happens. May is one of the best months to visit. Here is what to expect.
May marks the dry season transition in southwest Lombok. Daytime temperatures sit at 30°C with overnight lows around 24°C. Rainfall drops to about 70mm across six days — usually short afternoon showers rather than persistent rain. Humidity is dropping but still around 78%.
Sea conditions matter more for Tangkong than for the smaller Secret Gilis because the drop-off reef sits on the exposed north side. May produces calm mornings with only light swell. The 20-minute crossing from Tawun beach is comfortable. Surface conditions on the reef itself are calm enough for easy snorkeling all day.
Genuinely quiet. Many Secret Gilis day tours from Sekotong skip Tangkong entirely because it requires anchoring slightly offshore rather than dropping passengers on a beach. This means even on busy circuit days, Tangkong's reef may have only one or two boats. May compounds this with low overall tourist volume — pre-European-summer, pre-Australian-school-holidays.
In practice: a May Tangkong snorkel session often feels essentially private. You will share the reef with a small handful of other snorkelers, never the crowds that overwhelm Trawangan dive sites.
Tangkong's signature snorkel is the north-side drop-off. The reef structure:
The drop-off is what concentrates fish life. May visibility ranges from 12-20 metres — not as crystal as June's annual peak but still excellent.
May is a strong month for big-fish encounters at Tangkong:
The big-fish action happens at the drop-off edge. Stay near the reef wall and look out into blue water — the pelagics come in from the deep.
The drop-off reef requires a different approach than beach snorkeling:
1. Boat anchors above the shallow lagoon (about 30 metres offshore)
2. Snorkel out from the boat following the reef contour
3. Swim along the drop-off edge — currents can move you
4. Watch the deep water side for big fish
5. Allow at least 60 minutes for a proper session
Beginner snorkelers can stay in the shallow lagoon area with smaller fish. Intermediate snorkelers should follow the drop-off edge for the better experience.
Building a Secret Gilis day around Tangkong:
Prioritizing Tangkong while light is good and water is calm is the right call. Lunch and photos can happen later.
Shoulder pricing across the board. Boat charter for the full four-island circuit (with insistence on Tangkong) runs 350,000-500,000 IDR. Group day tours from Sekotong run 150,000-250,000 IDR per person — confirm Tangkong is included before booking.
Snorkel gear rental on the boat costs 50,000-100,000 IDR. Quality is mediocre; bring your own mask and fins if possible.
The cheapest Sekotong day tours often skip Tangkong because:
The result: a "Secret Gilis tour" without Tangkong is genuinely just photo stops. The drop-off reef is the actual destination. Confirm in writing or by message with your tour operator that Tangkong with snorkel time is included.
The combination of calm sea, dry weather beginning, low crowds, and high boat reliability makes May genuinely one of the best months for Tangkong. Only June rivals it for snorkel conditions, and June has more crowds. May is the sweet spot.
For travelers who want one excellent Secret Gilis day, time the trip for May, base in Sekotong or at Pearl Beach Resort on Gili Asahan, and prioritize Tangkong over the photo-stop islands. The reef is genuinely good and it is yours.
Tawun beach is 90 minutes from Mataram airport or 60 minutes from Senggigi. The road is paved but slow. Hire a Grab or arrange transport through accommodation. Some Sekotong hotels include Secret Gilis day tours in their packages. Direct charter boats also operate from some Sekotong piers.
Tell your boat captain in advance and in writing that Tangkong is mandatory on the circuit. Many cheap day tours skip Tangkong because the drop-off reef requires anchoring slightly offshore and the captain prefers the easy beach drop-offs at Kedis and Nanggu. Tangkong is the genuine snorkel highlight — without it, the circuit is mostly photo stops.