Sabah island weather: wet and dry patterns

We do not hold a verified Sabah wet and dry calendar, so we will not give you a month list that looks certain. What we can do is show you how weather connects to permits, deposits and boat days, and what to ask for in writing. For Sabah islands, the useful question is not “which month is dry” but “what happens to my money and my days if the sea is rough”.

For the wider date question, start with when is the best time to visit Malaysian islands.

Why do we not give a Sabah month table?

Because the sources we found do not support one. Sabah’s islands sit on different coasts and in different seas, and a single pattern for all of them would be a guess. A guess dressed as a calendar is worse than a plain gap.

Instead, ask each operator for the wet and rough-sea weeks they see, and ask what they do on those days. Their answer is about their own island, which is what you are booking.

How do permits turn weather into a money question?

For Sipadan, permits are booked by registered dive operators through Sabah Parks, up to six months ahead ^[1]. A 50 percent deposit is due, and full payment follows two weeks before the date ^[1]. If you cancel more than two weeks before, 10 percent is kept, and under two weeks everything is forfeited ^[1].

So a rough week close to your date is not only a nuisance. It can decide whether your money comes back. Read Sipadan permits explained and see our Pulau Sipadan guide. Then ask the operator how a weather-cancelled dive day is treated, because the rule above covers cancelling by you and may not cover a day the sea closes.

How does weather differ by trip type?

Trip	Weather matters because	Ask the operator
Kota Kinabalu park island	Short boat, but rough days still stop sailing	Is there a rebooking day
Semporna islands	Longer boats and open water	What happens to nights already paid
Sipadan dive day	Permit date is fixed in advance	How a weather day is treated
Remote resort island	Few alternatives if stranded	Who arranges a safe return

A short boat is not a promise. The Kota Kinabalu route starts at Jesselton Point, where one resort lists a speedboat from its lounge with a transfer booked separately ^[3]. Ask who pays if that boat does not run.

What does a Sabah day look like when one sea day is lost?

Take a 3-night trip and lose the first day to rough sea. You arrive a day late, so you have two nights on the island and your paid first night is gone unless the resort moves it. If a dive permit sits on the lost day, that permit may be gone too.

A buffer makes this survivable. Add a mainland night before a fixed-date dive, and keep your return flight a day after the last island night if you can. Our rough-sea warnings guide shows how the decision usually travels from forecast to boat.

Where do you check conditions?

The national forecaster publishes strong-wind and rough-sea warnings on its website and the myCuaca app, updated about every three hours ^[2]. Check them the day before and that morning, then ask the boat operator. They decide whether the boat goes.

Questions to put in writing

1. Which weeks do you see the most rain and rough sea?
2. How is a day treated when the sea stops the boat?
3. If a permit date is lost, who bears the cost?
4. Is there a rebooking day, a credit or a refund?
5. Do you advise a mainland night before a fixed-date activity?

A better fit if…

A Sabah island trip suits you if you can leave a spare day and ask the hard questions early. It is a poorer fit if your dates are fixed and every day is paid in advance. In that case choose an easier route, and read which Sabah island suits a first Borneo trip.