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The best time to visit Gili Air is from April to October, and September is the single best month. The dry season gives you the clear water the island is booked for, and September adds the calmest sea of the year.
The crossing is the part people get wrong. July and August are the roughest weeks at sea on a southerly swell, so the busiest months are also the ones where transfers are least comfortable.
| Month | High/Low (°C) | Rain |
|---|---|---|
| January | 30°/ 26° | 16 days |
| February | 30°/ 26° | 23 days |
| March | 30°/ 26° | 29 days |
| April | 31°/ 26° | 23 days |
| May | 31°/ 26° | 6 days |
| June | 30°/ 24° | 1 days |
| July | 29°/ 23° | 3 days |
| August | 29°/ 23° | 0 days |
| September | 29°/ 23° | 0 days |
| October | 30°/ 25° | 2 days |
| November | 31°/ 26° | 15 days |
| December | 31°/ 27° | 28 days |
April is the changeover month and one of the quietest. The rain thins out, the sea settles, and rates are still at shoulder level.
May is dry, calm and uncrowded, which makes it the best value month of the year for Gili Air.
June is dry with good underwater visibility and a sea that is still settled. It is the last month before the crowds and the swell both arrive.
July is dry above the water and unsettled on it. The southerly swell picks up and fast boats from Bali start cancelling on rough days.
August is the driest and busiest month, and the swell is still running. Book accommodation early and allow slack in your dates for a delayed transfer.
September is the best month of the year here. It keeps August's dry weather, the sea calms down and the peak-season crowds have gone.
October is calm and still mostly dry, and it is the other month worth picking if the crossing matters to you.
November is where the wet season starts. There is no motorised transport on the island, so once the sand paths turn muddy, getting about becomes a walk in the rain.
December and January are the wettest months. Storms churn the water and cut visibility, which removes the main reason to be on Gili Air at all.
If your dates are fixed here, nowhere in Indonesia is dry, but Phu Quoc in Vietnam is mid dry season through both months.
The roughest water of the year is July and August, which is also the peak booking season. If you get seasick or you are travelling with children, September and October are worth more than a marginally drier forecast in August.
For snorkelling and diving, visibility follows the rain: best from June to October, poorest from December to March. The same holds for the Nusa Penida crossings out of Bali.