Best time to dive Gili Air, Indonesia

Best time to dive Gili Air, Indonesia — month-by-month guide

In one paragraph

Gili Air dives year-round. Water sits at 27–29 °C and visibility ranges 15–30 m every month. The two windows that matter most: April–October is the dry season (calmest conditions AND best visibility, 20–30 m), November–March is the rainy season (visibility drops to 15–20 m as plankton-rich water moves in — but that same plankton draws the manta rays to Manta Point south of Gili Trawangan). Turtles are guaranteed sightings every month.

Dry season (April–October) — calm seas, easy training

The dry months are when the Lombok Strait sits glass-flat in the morning. Boat rides are smooth, surface chop almost vanishes, and the Open Water training dives in 12–18 m are at their easiest. Visibility ranges 20–30 m and peaks in the middle of the dry season — slightly less plankton in the water means more light gets through. July–August is peak season (book accommodation early); September–October is the sweet spot of calm conditions plus fewer travellers.

Rainy season (November–March) — manta season, lower visibility

Counterintuitively, rainy season is when the *big stuff* shows up. Plankton-rich monsoon water draws reef manta rays to Manta Point off Gili Trawangan (peak November–April per the [Indonesia diving calendar](https://aboutdiving.com/indonesia-diving-calendar/)). That same plankton drops visibility to 15–20 m — still very divable, just less of a "see the whole reef at once" feeling. Rain falls in short intense bursts, usually overnight or in late afternoon, so boat schedules are rarely affected.

What you see, every month

**Turtles year-round** — green and hawksbill, often hovering at cleaning stations 8–12 m down. **Reef sharks** at Shark Point and Deep Turbo, typically December–April. **Manta rays** at Manta Point November–April. **Mola mola** is a Nusa Penida fixture, not Gili — but if you have an extra day, the day trip is doable. Macro life (frogfish, ghost pipefish, nudibranchs) sits at Mirko's Reef and Hans Reef most months, with the best macro density in shoulder-season May and October.

Common questions

Is there a "do not dive" month?

No. We run dive trips 365 days a year. The rare day we cancel is for a specific weather window (a major Pacific storm system, every few years), never for general "rainy season".

When does it rain — and does it stop diving?

November–March, mostly. The rain comes in short heavy bursts — usually overnight or late afternoon. Underwater you don't notice it. Boat rides 5–15 min are short enough that we wait 20 minutes for a squall to pass and then go.

Best month for first-time divers learning Open Water?

May, September, October. The water is calm, visibility is good (~20 m), crowds are thinner, and the surface intervals between dives are pleasant. April and November are also excellent but slightly less predictable. Avoid late-July/August if you can — peak crowds + busy boats + harder accommodation booking.