Operator pages will tell you catamaran cruises run all year in Mauritius. That is true, and it is not the same as saying every month and every coast is equally comfortable.
Mauritius has a prevailing wind that is noticeably stronger for four months of the year, a coast that takes that wind head-on, and another that sits in its shadow. Nobody selling you a cruise explains this, because most operators only sail one route and none of them want to talk you out of August. So here it is: what the sea is actually doing month by month, which coast stays calm when, and what to do if you are one of the people who goes green on boats.
If you are still deciding between routes rather than months, our comparison of which coast has the best catamaran cruise in Mauritius covers that first decision. And for the full picture of the cruises themselves, see our complete guide to catamaran cruises in Mauritius.
The two things that decide your sea conditions
The south-east trade winds. Mauritius sits in the trade wind belt, with near-constant wind from the south-east. It is strongest during the cool season, roughly June to September. The wind is why the south-east of the island receives around 1,600mm of rain a year against about 1,200mm on the sheltered north-west, and it is why the kitesurfers are all clustered on the south-east coast.
The island’s own mountains. The central range blocks the trade winds, leaving the north-west and west in a wind shadow. That is not a minor local effect — it is the reason the resort strip runs from Trou aux Biches round to Flic en Flac, and the reason a west-coast morning in August can be glassy while the east is choppy on the same day.
Put together: the month tells you how much wind there is, and the coast tells you whether you are in it.
The best time for a catamaran cruise in Mauritius, month by month
December to April — warm, calm, and cyclone season
Water at its warmest: 27–28°C in January and February. Winds at their lightest, so open-water crossings to the northern islands are at their most comfortable. Air hot and humid, with short, heavy afternoon showers.
The catch is genuine. Mauritius’s cyclone season officially runs from 1 November to 15 May, with cyclones most frequent from late December to mid-April. A cyclone anywhere in the region produces swell and cancelled boat trips for days, not hours. You will very probably be fine — most visitors in February never see one — but book your cruise for early in your trip so there is room to move it.
May — the quiet transition
Often the most underrated month on the water. Humidity drops, the wind has not fully set in, the sea is still around 25°C, and the high-season crowds have gone. If you are choosing your holiday dates around a boat trip, May is a strong answer.
June to September — driest, clearest, windiest
This is the cool season, and the trade winds are at their peak. Sea temperature drops to about 23.5–24°C from July, which is still perfectly swimmable but cool enough that you will want a towel and something dry to change into. Air is comfortable, rain is low, and visibility underwater is often at its best.
It is also the four-month window where the coast you pick genuinely matters. The northern open-water crossing to Coin de Mire, Gabriel and Flat Island can be lively; the east-coast lagoon and the west coast stay comfortable. This is also whale season — humpbacks pass the west coast from roughly July to October — so the calmest coast is also the most interesting one during the windiest months. Convenient, for once.
Pack a windbreaker. Twenty-four degrees of water and a strong breeze on a wet deck is colder than the forecast suggests.
October and November — the sweet spot
Winds easing off, water warming back up, cyclone risk still low through October, and the December crowds not yet arrived. If someone asks us for the single best month for a Mauritius catamaran cruise without any other constraints, the answer is October.
| Period | Sea temp | Wind | Cyclone risk | Best coast for cruising |
|---|---|---|---|---|
| Dec–Feb | 27–28°C | Light | Highest | Any; north is at its best |
| Mar–Apr | 26–27°C | Light | Still present | Any |
| May | ~25°C | Building | Very low | Any |
| Jun–Sep | 23.5–24°C | Strongest | Negligible | West, or east lagoon |
| Oct–Nov | 24–26°C | Easing | Low until Nov | Any; north excellent again |
Which coast is calm, and when
The east coast lagoon (Ile aux Cerfs) — flat almost always. Counter-intuitive, because this coast is exposed to the trade winds. The reason it works is the lagoon: it is wide here, and the reef sits well offshore, so the swell breaks a long way out and the boats sail on protected water. In practice, this is the most reliably comfortable cruise in Mauritius in any month, which is why it is the one we point nervous passengers towards.
The west coast (Black River, Tamarin) — calmest open water. In the wind shadow for most of the year. This is the coast that behaves best in June to September, and it is where the dolphins are, precisely because they want the same calm water you do.
The northern crossing (Coin de Mire, Gabriel, Flat Island) — the variable one. Brilliant from October to April: real sailing on open water, engines off. Between June and September the outbound leg into the wind can be bumpy. A catamaran handles it far better than a single-hulled boat, and plenty of people love it — but this is the one trip on the island where a swell is a realistic prospect.
Sunset cruises — calmer than the same coast at midday. The trade winds typically ease in the late afternoon. A two-hour sunset sail is the gentlest boat trip available, and our Sunset Catamaran Cruise from Grand Baie at €38 for adults and €19 for children is the trip we suggest for a first-timer who is genuinely unsure whether they will cope.
If you get seasick
Most people worry about this more than they need to, and a few people need to worry more than they do. Both groups benefit from the same preparation.
Why a catamaran is the right boat for you. Two hulls set wide apart resist rolling in a way a single hull cannot. The motion you get is a gentler pitch rather than the side-to-side roll that causes most seasickness. If boats have gone badly for you before on a monohull or a small ferry, a catamaran is a genuinely different experience.
Take something before you board, not when you feel ill. This is the single most important line in this article. Motion sickness tablets — cinnarizine, or the dimenhydrinate and meclizine sold in most pharmacies — need roughly an hour to work and do very little once nausea has started. Buy them before you travel and take one an hour before the jetty. Scopolamine patches are prescription-only in most countries and go on several hours ahead; ask your own pharmacist, since we are not able to give you medical advice.
Ginger and acupressure bands have modest evidence behind them and no downside. They are worth having as a backup rather than as your only plan.
Where to stand matters more than anything you swallow. Go amidships, low down, in the open air, and look at the horizon or at the land. The bow netting is the best seat on a catamaran on a calm day and the worst place on the boat in a swell — it is where the pitching is largest. Do not go below deck. Do not read. Do not scroll your phone; a fixed screen while the world moves is the fastest route to trouble.
Eat something bland beforehand. An empty stomach is worse than a light one. What you want to avoid is the combination that catches people out on full-day cruises: a big barbecue lunch, several rum punches, and then an hour of swell on the way home. Pace the open bar.
Book the shape of trip that suits you. In order of gentleness: a two-hour sunset sail on the west or north coast, then a full day inside the east-coast lagoon, then a west-coast morning, then the northern islands crossing in winter. If you are anxious, start at the top of that list.
And if it happens anyway: stay on deck, look at the horizon, sip water, and tell the crew. They deal with it on most sailings; they are not remotely surprised, and every boat carries somewhere sensible to be unwell.
When cruises get cancelled, and how to protect yourself
Catamaran cruises in Mauritius are cancelled for weather more often than people expect, and you want an operator who does it. The decision is usually made early in the morning, based on swell and wind rather than rain — a grey drizzly day is generally fine, and a bright breezy one sometimes is not.
Cancellations cluster in two places: cyclone season, particularly late December to mid-April, and windy winter mornings on exposed coasts.
Three things protect you:
Book early in your holiday. You can move a cruise on day two to day five. You can’t move a cruise on your last afternoon at all. This is the most useful piece of planning advice in this article, and it costs nothing.
Check the cancellation window before you pay. We hold free cancellation up to 24 hours before departure on our activities. Some operators require 48 hours, and a few are non-refundable — which is a problem when the weather turns inside 24 hours, as it does here.
Have a wet-weather alternative in mind. If the sea is out, the island’s interior is unaffected: waterfalls, tea estates and nature parks all run in weather that stops boats.
Frequently asked questions
What is the best month for a catamaran cruise in Mauritius?
October, for most people: winds easing after the trade wind season, water warming back towards 26°C, low cyclone risk and fewer crowds than December. May is the close second for the same reasons in reverse. December to April gives the warmest water and calmest winds but carries cyclone risk.
Is the sea rough in Mauritius in July and August?
Outside the lagoon, it can be. July and August are the peak of the south-east trade winds, so open-water crossings — particularly the northern islands route — are at their least comfortable. Inside the east-coast lagoon and along the sheltered west coast, conditions usually stay calm. The coast you choose matters more than the month in these two months.
Do you get seasick on a catamaran?
Less often than on a single-hulled boat, because the twin hulls resist rolling. Inside the lagoons, most passengers feel nothing at all. The trips where seasickness is a realistic prospect are open-water crossings during the June to September trade wind season, and even then a catamaran is the most forgiving vessel available.
What should I take for seasickness before a boat trip?
Take an over-the-counter motion sickness tablet about an hour before boarding rather than waiting for symptoms, since they work poorly once nausea has begun. Ginger and acupressure bands are harmless additions. Ask a pharmacist about what suits you, particularly if you take other medication — this is general information, not medical advice.
Can you still do a catamaran cruise during cyclone season?
Yes, and most trips between December and April run normally. What changes is the chance of a cancellation, because a cyclone anywhere in the region generates swell for several days. Book your cruise for the first half of your holiday and check the cancellation policy before paying.
Which coast is calmest in winter in Mauritius?
The west coast around Black River and Tamarin, which sits in the island’s wind shadow. The east-coast lagoon at Ile aux Cerfs is also consistently flat because the reef is far offshore. The northern open-water crossing is the most exposed from June to September.
How cold is the sea in Mauritius in winter?
About 23.5 to 24°C from July through October — swimmable without a wetsuit for most people, but cool enough after a snorkelling stop that you will want a towel and a dry layer. Summer sea temperatures reach 27 to 28°C in January and February.
What should I wear on a catamaran cruise?
Swimwear, a light cover-up, a hat and sunglasses year-round. From June to September, add a windbreaker or fleece — a breeze on a wet deck at 24°C is colder than the air temperature suggests. Bring water shoes or old trainers if the trip includes landing on an island, and use high-factor reef-safe sun cream, reapplying halfway through the day, because sun reflected off the water and the white deck is roughly double what you expect.
The planning rule, in one line
Pick October or May if you can choose freely; if you are coming between June and September, book the east-coast lagoon or the west coast rather than the northern crossing; take a tablet an hour before you board; and put the cruise early in your holiday so the weather gets a second chance.