What Is the Weather Like in Mauritius in September?
September sits at the tail end of the Mauritian winter, and it is one of the most reliably comfortable months to visit the island. Temperatures are mild rather than hot, the humidity is lower than in the summer months, and the trade winds that sweep in from the southeast keep things feeling fresh without ever turning cold. If you are trying to decide whether September is a good time to go, the short answer is yes, with a few regional caveats worth knowing.
Average daytime highs across the island sit around 24 to 26 degrees Celsius in September, while overnight lows drop to roughly 18 to 20 degrees Celsius at sea level. The water temperature is around 23 to 24 degrees Celsius, which is comfortable for swimming, snorkelling and diving, though noticeably cooler than the 28 to 29 degrees you would find in January or February.
Mauritius Temperature in September: Averages by Region
Mauritius is a small island but its topography creates meaningful differences between the coast and the interior, and between the sheltered west and the windward east and south.
The West Coast (Flic en Flac, Le Morne, Tamarin)
The west coast is the driest and sunniest part of the island year-round, and September is no exception. Daytime temperatures here regularly reach 25 to 27 degrees Celsius, and the lagoon is calm because the Morne Brabant mountain range blocks much of the southeast trade wind. If you want reliable sunshine and flat water in September, the west is your best bet. Rainfall is low, typically under 30 mm for the month.
The North Coast (Grand Baie, Trou aux Biches, Pereybere)
The north is sheltered from the prevailing trade winds and shares the west coast's relatively dry character. Highs of 24 to 26 degrees Celsius are typical, with a gentle breeze most afternoons. The lagoon here is wide and shallow, so the water warms a little faster than on the east side. September is a quieter month in Grand Baie compared to the European summer peak in July and August, which means better prices and fewer crowds at the restaurants and beach bars along the Royal Road.
The East Coast (Belle Mare, Trou d'Eau Douce, Mahebourg)
The east coast faces the trade winds directly and feels noticeably breezier than the west. Temperatures are similar, around 23 to 25 degrees Celsius during the day, but the wind chill makes it feel a degree or two cooler. Rainfall is higher here than on the west, and you can expect occasional showers, particularly in the morning. The upside is that the east coast beaches are spectacular and the water is a vivid turquoise. Kite surfers and windsurfers love this stretch of coast in September precisely because of the consistent wind.
The South Coast (Souillac, Bel Ombre, Riviere des Anguilles)
The south is the most exposed part of the island in winter. Winds are stronger, swells are bigger and the landscape is wilder. Daytime highs are a couple of degrees lower than the north and west, sitting around 22 to 24 degrees Celsius. This is not the coast for calm swimming in September, but it is excellent for scenery, hiking along the cliffs and visiting Chamarel and the Black River Gorges National Park, which are at their greenest after the winter rains.
The Central Plateau (Curepipe, Rose Hill, Quatre Bornes)
The interior highlands sit at 500 to 600 metres above sea level, and the temperature difference is significant. Curepipe, which has a reputation for being the coolest and wettest town on the island, sees September highs of around 19 to 21 degrees Celsius and lows that can drop to 14 or 15 degrees Celsius at night. If you are staying in the highlands or passing through on a day trip, bring a jacket. The mist that rolls through the plateau in the late afternoon is atmospheric rather than unpleasant, but it can arrive quickly.
Rainfall and Sunshine in September
September is a dry month by Mauritian standards. The island's rainy season runs roughly from November to April, so by September the heavy tropical downpours are months away. That said, the southeast trade winds carry moisture, and the windward (east and south) coasts receive more rainfall than the leeward (west and north) coasts throughout the year, including in September.
Typical September rainfall figures:
- Port Louis (northwest): 15 to 30 mm for the month
- Grand Baie (north): 20 to 35 mm
- Belle Mare (east): 40 to 60 mm
- Curepipe (central): 60 to 90 mm
- Souillac (south): 50 to 75 mm
Sunshine hours average around 7 to 8 hours per day on the west and north coasts in September, dropping to 5 to 6 hours on the east and south. Showers, when they come, tend to be brief and pass quickly, unlike the sustained rain of the cyclone season.
Sea conditions are generally good in September. The lagoon on the west and north coasts is calm and clear. On the east and south, there can be a moderate swell, which is fine for experienced swimmers but worth bearing in mind if you are travelling with young children.
How Does September Compare to Nearby Months?
Understanding September is easier when you place it in context.
August is the coolest month of the Mauritian year and coincides with the European school holidays, so it tends to be busy and slightly more expensive. Temperatures are a degree or two lower than September and the trade winds are at their strongest.
October marks the start of the transition toward summer. Temperatures begin to climb, humidity starts to rise and the first occasional tropical showers of the pre-cyclone season can appear toward the end of the month. It remains a very pleasant month to visit.
September sits between these two: warmer than August, calmer than October, and without the crowds that peak in July and August. For many travellers, particularly those who find the European summer heat uncomfortable, September is the sweet spot.
What to Pack for Mauritius in September
Packing for September in Mauritius is straightforward once you account for the coastal versus highland temperature difference.
For the coast:
- Light cotton or linen clothing for daytime: shorts, t-shirts, sundresses
- A light cardigan or long-sleeved layer for evenings, particularly if you are dining outdoors near the water
- A waterproof jacket or a packable rain layer if you are spending time on the east or south coast
- Swimwear, reef-safe sunscreen and a rash vest if you plan to snorkel or spend long hours in the water
- Comfortable walking sandals and a pair of closed shoes for evenings out
For the interior and highlands:
- A proper fleece or mid-weight jacket for evenings and early mornings in Curepipe or the Black River Gorges area
- Waterproof shoes or trail shoes if you are hiking
- An extra layer for the car journey home after sunset, when the plateau cools quickly
Sun protection: The UV index in Mauritius in September is still high, typically reaching 7 or 8 on clear days. Apply sunscreen even when it feels cool, because the trade wind makes it easy to underestimate how much sun you are absorbing.
Mosquitoes: September is not a high-risk month for mosquitoes compared to the wet summer months, but it is worth packing a repellent, particularly if you are staying near rivers, wetlands or the mangrove areas around the north and east.
Activities That Work Particularly Well in September
The conditions in September open up a range of activities that are less enjoyable in the hot, humid summer months.
Hiking and nature walks: The Black River Gorges National Park is at its most lush and manageable in September. The paths are not muddy from summer rains, temperatures are comfortable for walking and the birdlife, including the endemic Mauritius kestrel and the pink pigeon, is active. The Gorges Viewpoint and the Alexandra Falls trail are both accessible and rewarding.
Whale watching: Sperm whales and humpback whales pass through Mauritian waters between July and October. September is one of the better months for sightings, particularly off the west coast near Le Morne and Tamarin. Several operators run excursions from Tamarin Bay, and while sightings are never guaranteed, the odds are good in September.
Diving and snorkelling: Visibility is excellent in September, with water clarity often reaching 20 to 30 metres. The cooler water temperature means you may want a 3 mm wetsuit for longer dives, but the reduced plankton bloom of the summer months makes September a favourite among divers. The sites around Flic en Flac, Blue Bay Marine Park and the northern drop-offs are all accessible.
Kite surfing: The southeast trade winds are consistent in September, making the east coast around Le Morne and the lagoon at Anse La Raie popular with kite surfers. Lessons and equipment rental are available at several spots.
Golf: The central and south of the island have several well-regarded golf courses. September's mild temperatures make a round far more enjoyable than the sweltering summer months, and the courses are green and well-maintained after the winter rains.
Markets and local life: September falls outside the main European tourist season, which means the island is quieter and more relaxed. The weekly markets at Flacq (Wednesday and Sunday), Port Louis central market and the Quatre Bornes market (Thursday and Sunday) are worth visiting for fresh produce, local spices and everyday Mauritian life without the peak-season crowds.
Practical Tips for Travelling in September
Accommodation prices: September is shoulder season in Mauritius, sitting just after the July to August peak and before the December to January peak. You will generally find better rates than in the school holiday months, and availability is easier. That said, the long weekend around Mauritian public holidays can still push prices up locally, so check the calendar when you book.
Flights: Direct flights to Sir Seewoosagur Ramgoolam International Airport operate from several European and regional hubs. September is not the busiest month, so fares tend to be more competitive than in July and August, though booking a few months ahead is still sensible.
Cyclone risk: September is well outside the cyclone season, which runs from roughly November to May. There is no meaningful cyclone risk in September. The trade winds can be brisk, particularly on the east coast, but these are benign conditions compared to a tropical storm.
Daylight hours: Mauritius is in the southern hemisphere, so September is early spring. Sunrise is around 6:00 to 6:15 am and sunset around 5:45 to 6:00 pm, giving you roughly 12 hours of daylight. This is enough for a full day at the beach or on the trails without the brutally early sunsets of June and July.
A Realistic Day in Mauritius in September
To make this concrete: imagine you are staying on the west coast near Flic en Flac. You wake at 6:30 am to clear skies and a temperature of around 20 degrees Celsius. By 9:00 am it is 23 degrees and you are comfortable in a t-shirt and shorts. The lagoon is flat and warm enough for a long swim. By midday the temperature peaks at around 26 degrees and the trade wind keeps it from feeling oppressive. You eat lunch at one of the small restaurants along the beachfront, where the menu will lean heavily on fresh fish and grilled seafood. In the afternoon the wind picks up slightly, which is welcome rather than annoying. By 5:30 pm the sun is low and the light is golden. You need that light cardigan by 7:00 pm if you are sitting outside for dinner. It is a very easy, very pleasant day.
If you were on the east coast instead, the morning might start with a brief shower, the wind would be more noticeable all day and you would want that light jacket earlier in the evening. But the beach would be less crowded and the water colour would be worth it.
Summary: Is September a Good Month to Visit Mauritius?
September is one of the most comfortable months to visit Mauritius. Temperatures are mild and manageable, rainfall is low (especially on the west and north coasts), the sea is clear and calm, and the island is quieter than in the peak European school holiday months. The main trade-off is that the water is cooler than in summer and evenings require a layer. Neither of these is a serious drawback for most travellers. For those who dislike heat and humidity, September may actually be the best month of the year.