When to Dive in Réunion Island: Seasons, Water Temperature and Sea ConditionsYou can dive all year round in Réunion Island

In Saint-Leu, on the west coast, every season offers opportunities to explore the island’s reefs and underwater landscapes. The water is generally warmer during the southern summer and cooler during the southern winter.

However, water temperature is only one factor to consider. Wind, swell, visibility and the type of diving you want to do also matter.

Planning your first scuba experience, some recreational dives or a training course? Here are the main things to know when organising your stay.

Can you really dive all year round in Réunion?

Yes, diving is possible throughout the year, whenever sea conditions allow.

This does not mean that every dive site is accessible every day. Depending on the weather and the participants’ experience, a trip may be adjusted, moved to another site or rescheduled.

At Excelsus Plongée, we take these factors into account when planning our outings. A site suitable for experienced divers may not be appropriate for someone’s first dive on the same day.

The best time to visit depends on your preferences, while the choice of dive site depends on conditions at the time.

What is the water temperature in Réunion?

When planning your stay in Saint-Leu, expect water temperatures generally ranging from 23 to 28°C throughout the year.

The water warms up during the southern summer and gradually cools during the southern winter. These changes happen progressively rather than suddenly at the start of a new season.

Season	General water temperature trend	What to consider
Southern summer	Generally the warmest water	Short suit or 3mm
Transition towards winter	Gradually cooling water	5mm
Southern winter	Generally the coolest water	5m and more
Transition towards summer	Gradually warming water	5mm

These trends are a guide rather than a substitute for a recent update from the dive centre. If you are travelling with your own wetsuit, ask us about the water temperature before you arrive.

Your comfort also depends on how easily you feel the cold, how long you spend underwater and how many dives you plan to do.

Diving during the southern summer: warmer water

The southern summer is the warmer, wetter part of the year, generally from November to April.

For divers who enjoy warm water, this can be a particularly pleasant time to visit. You can explore the reefs without experiencing the cooler temperatures of winter.

However, heavy rainfall and tropical weather systems can affect conditions. Depending on their location and development, they may disrupt diving and lead to cancellations.

Our tips for planning summer dives

Schedule your first dives early in your holiday and, if possible, leave some flexibility for rescheduling.

It is also best to avoid fitting an entire course into the final days of your stay. Allowing a few extra time slots gives you more flexibility if sea conditions interrupt your training.

Diving during the southern winter: cooler water

During the southern winter, a suitable wetsuit allows you to continue enjoying your dives despite the cooler water.

This season can also bring episodes of southerly swell. Generated far from Réunion, these swells can reach the island even when the local weather appears pleasant.

Blue skies and little wind at the dive centre do not necessarily mean calm conditions at the planned dive site.

This does not make the whole season unsuitable for diving. It simply means that marine forecasts need to be considered and the programme adjusted when necessary.

For comfort after your dive, bring a towel, dry clothes and a windproof jacket for the boat.

Are the transition seasons a good time to dive?

The periods between summer and winter can suit a holiday combining diving, sightseeing and hiking.

However, they do not guarantee calm seas. Conditions vary from year to year and from week to week.

If your dates are flexible, tell us what you have in mind: a first dive, exploring volcanic underwater landscapes, several days of diving or a training course. We can help you organise your dives around your priorities.

Wind, swell and rain: what actually affects a dive trip?

Wind

Wind can make the boat journey and time spent on board less comfortable. Its effects depend on its strength, direction and how exposed the dive site is.

One area may be sheltered while another is choppy. This is one reason why the programme may change.

Swell

Swell can originate from weather systems a long way away. It affects access to dive sites, water entries and conditions around the reefs.

Marine forecasts therefore matter more than simply checking the weather forecast for Saint-Leu.

Rain

A rain shower does not automatically mean that a dive will be cancelled.

However, heavy rainfall can reduce visibility locally, particularly where runoff reaches the sea.

Currents and visibility

Visibility and currents can vary between dive sites. The time of year alone cannot tell you exactly what conditions you will find underwater.

Our team considers all these factors when selecting a suitable dive.

When is the best time for an introductory scuba dive?

You can plan an introductory dive at any time of year, provided conditions are suitable for beginners.

Choosing an appropriate day and dive site matters more than finding a supposedly perfect month.

If you feel the cold easily, you may prefer the warmer-water months. During cooler periods, suitable thermal protection remains essential.

Our advice is to book your introductory dive near the beginning or middle of your holiday. This leaves room for rescheduling and, if you enjoy the experience, time to dive again.

Find out more about introductory scuba diving in Saint-Leu.

When should you plan recreational dives or a diving course?

For certified divers, the time of year does not guarantee access to a particular site.

Would you like to explore the Grand Tombant at Pointe au Sel, a wreck or the underwater formations at Bossy’s Canyon? Tell us your preferences when booking, along with your certification level and recent diving experience. The programme will remain subject to conditions and the qualifications required for each dive.

Explore our guide to Saint-Leu’s dive sites to help plan your dives.

For a training course, allow enough flexibility in your schedule. Spreading out the sessions lets us take your progress, your pace and any weather changes into account.

Browse our scuba diving courses in Réunion to find an option that suits your goals.

What wetsuit should you bring for diving in Saint-Leu?

Your choice depends on the water temperature, dive duration and how easily you feel the cold.

At Excelsus, we have equipment including 3 mm shorties and 5 mm full-length wetsuits, with hoods available if needed.

If you are planning several dives, let us know if you tend to get cold. Water that feels pleasant at first can feel cooler over repeated dives.

If you are bringing your own equipment, contact us before your stay so you can choose protectioncom.