Weather hazards in the Maldives: swell, storms and safety

The Maldives sits close to the equator, so the air stays hot all year, at around 30–31°C, and the sea at about 28–29°C. What changes is the wind. The Maldives Meteorological Service describes two monsoons:

• Northeast monsoon (January–March): the dry season. Calmer seas on most days, though strong winds can still blow, mainly across the central and northern atolls.
• Southwest monsoon (mid-May to November): the wet season. More rain, more wind and bigger swell. November is often the wettest month in Malé.
• April and December: transition months. April is when thunderstorms are most frequent, according to the Met Service.

For month-by-month detail, see our best time to visit the Maldives guide, or jump straight to the Maldives in June or the Maldives in November.

What udha is

*Udha* is the Dhivehi word for a swell surge: waves that run up over the beach and into the edges of an island. The Met Service says these happen almost every year, on almost every island, at different strengths. They are worst when big swell and wind-driven waves arrive on spring tide days, around the full and new moon, and at high tide.

Most of the Maldives sits only a metre or so above the sea, so even a moderate surge can push seawater into gardens, lanes and the ground floors of houses on the exposed side of an island. Heavy rain can flood low lanes too.

When it happens

Surges are most common in the southwest monsoon, especially when the season sets in around May and June.

What it means for you

• Rooms close to the shoreline on the exposed side of an island may see water in the garden or on the path for a few hours around high tide.
• Don’t walk on sea walls, harbour edges or breakwaters while waves are breaking over them.
• Don’t swim off an exposed beach during a surge, even if the water looks shallow.
• Follow your host and the island council.

If you’re curious about the bigger picture, our guide to whether the Maldives is sinking explains sea level rise and why some islands are being raised.

The southwest monsoon usually arrives with a spell of strong southwest to northwest winds that can last a few days. A squall can build fast: the sky darkens, the wind jumps and heavy rain arrives within minutes, then passes.

The Met Service notes that strong winds can bring down trees and blow off roofs, and rough seas can stop inter-island ferries and fishing boats. In practice:

• Don’t shelter under coconut palms in a strong wind. Falling fronds and nuts are a real risk.
• Bring in anything loose from your balcony or terrace.
• If you’re on a sandbank or picnic island and the sky turns, ask the crew to leave early. Don’t wait for the squall to arrive.

Thunderstorms can happen at any time of year, and in the southwest monsoon they usually come with rain showers. Lightning is the main danger. On a flat island with no hills, you, a palm tree or a boat mast may be the tallest thing around.

• Get out of the water and off the beach when you hear thunder.
• Shelter inside a solid building. A beach hut, umbrella or open shelter is not enough.
• Stay away from lone palm trees, which lightning can strike and split.
• Unplug laptops and chargers if a storm is overhead. The Met Service warns lightning can damage electrical items.
• On a boat, stay low, away from the mast and metal fittings, and follow the crew.

The gaps in an atoll’s reef rim are called *kandu*. Every tide, water rushes in and out of the atoll through them. That is why channels are so good for mantas, sharks and big fish, and also why they can be dangerous for swimmers.

• Never swim or snorkel across a channel from the beach.
• Snorkel inside the reef or in the lagoon unless you’re on a guided boat trip.
• If you’re swept along, don’t fight the current. Swim across it, parallel to the reef, and raise an arm to signal for help.
• On drift snorkels and dives, stay with your guide and carry a surface marker buoy where the operator provides one.

Our guide to snorkelling in the Maldives covers reef safety in more detail.

This is the hazard that catches most visitors, because it doesn’t look like one. The sun is strong all year, even on cloudy days, and the sea and white sand reflect it back at you.

• Drink water through the day. Thirst is a late warning sign.
• Wear a long-sleeved rash vest when snorkelling. A burnt back after an hour face-down is very common.
• Watch for headache, dizziness or nausea, signs of heat exhaustion. Move to the shade, drink and cool down.

The Maldives Meteorological Service issues colour-coded alerts for heavy rain, squalls, swell surges and other hazards. As published on its website:

White and yellow alerts are common in the wet season and usually mean “plan around it”, not “panic”. Orange warnings are rare. Alerts often name specific atolls and a time window, so read which areas they cover.

Where to check

• The Met Service website, meteorology.gov.mv
• The Met Service’s official app and its social media accounts (@MetMaldives)
• Your host, boat crew or dive centre, who watch the same alerts

Rough seas are the most common way the weather affects a trip. Speedboats may be delayed, rerouted or cancelled, and slower public ferries may not sail. Excursions to outer reefs and sandbanks are often moved to sheltered spots or another day.

• Leave at least one spare day before an international flight if you’re staying on an island that relies on boat transfers.
• Stay in touch with your host or transfer provider the evening before you travel.
• Check that your travel insurance covers missed connections caused by weather.

On Dhiffushi, on the eastern rim of North Malé Atoll, shared speedboats take about 40–50 minutes from Malé and the airport. On rough days the crossing can be bumpy and occasionally postponed, and the MTCC public ferry does not run on Fridays. Our how to get to Dhiffushi guide has the options. For moving between islands generally, see getting around the Maldives.

Tsunamis are rare, but the Maldives knows them. The Indian Ocean tsunami of 26 December 2004 caused loss of life and wide damage across the country. Since then, the National Tsunami Warning Centre at the Met Service watches the Indian Ocean around the clock, paying special attention to the earthquake zones near Sumatra and the Makran coast.

The chance of meeting a tsunami on holiday is very small. It is still worth knowing the basics:

• If you feel a strong earthquake, or see the sea suddenly pull back from the shore, move away from the beach at once.
• Head for the upper floor of a solid concrete building, since most islands have no high ground.
• Follow instructions from the island council, police and the Maldives National Defence Force.

The single national emergency number is 911. You can also call police on 119, ambulance on 102 and fire on 118. On local islands, your host, the island council and the police are your first points of help. For health and general safety, read is the Maldives safe?