Grand Baie weather in September

September in Grand Baie: warm, dry, with clean air — one of the best months to visit.

Updated September 2026 · climate normals from ERA5 reanalysis

Grand Baie🇲🇺 Mauritius · Indian Ocean Islands · Beach93
  1. 80Jan
  2. 81Feb
  3. 83Mar
  4. 85Apr
  5. 89May
  6. 89Jun
  7. 90Jul
  8. 92Aug
  9. 93Sep
  10. 93Oct
  11. 92Nov
  12. 88Dec

#1 of 12 months in Grand Baie · #78 of 1413 destinations to visit in September · comfort 93/100 (tier S)

Days
25°C
Nights
21°C
Wet days
3
Sun
11 h
Humidity
71%
Daylight
12 h
Grand Baie, Mauritius
Photo: Karsten Ratzke · CC0

Traveller notes on Grand Baie in September

September in Mauritius is late winter: warm, sunny, and with October the driest and sunniest part of the year. The month improves as it runs - early September still carries strong trade winds, which ease towards the end - and those winds are why the north and west are the side to be on, Grand Baie among them, while the east takes the brunt of them. Regulars describe the north-west in September as warm to hot days with little rain and less humidity than midsummer. Our row still has 28.8 kph of wind against a 25.2C day and a 24.7C sea. The record: 20.8C nights, 2.6 precipitation days carrying 8.3mm and 11 hours of sun.
NorthAndWestInSeptember · September · 1 month ago · Read more on tripadvisor.co.uk ↗

Other months in Grand Baie

November is the front of the Mauritian summer, and regulars value it for what has not arrived: the humidity and the rain do not really kick in until December, and the cyclone season rarely starts before then either. October is named the driest and sunniest month with November and early December just behind it. They also say the coasts stop differing at this point in the year - the shore you choose matters in winter, not now - though the north-west around Grand Baie is where they report clear mornings running late into the afternoon. Their figures run hotter than ours: they say low 30s climbing through the month, our row has 27.8C reading as 30C at 73 percent humidity. The record: 28.2mm across 8.3 days, 11.9 hours of sun and a 26.8C sea.
TheCoastYouPickStopsMattering · November · 1 month ago · Read more on Tripadvisor ↗
August is Mauritian winter and the advice regulars give is entirely about which coast you pick. The south-easterly trades blow hard now, so the east and south feel cool and windy while the north, north-west and west - Grand Baie among them - get the best of it. Our row's 29.7 kph is that wind measured on the sheltered side. Days are fine at 24.6C; evenings are the part people underpack for, and a wrap earns its place at 20.5C reading as 19C. The wind holds until about mid-September before easing ahead of the summer rains, and late August is already warmer. Rain is minimal at 13.8mm across 3.6 days. The record: humidity 71 percent, 10.4 hours of sun, a 24.7C sea and AQI 39.
NorthCoastNotEast · August · 1 month ago · Read more on Tripadvisor ↗
Mauritius forum threads are direct that January is hot and humid summer, often pushing past 30C, and sits right in the wettest and peak cyclone stretch of the year (January-March). The typical rain pattern described: a burst of maybe 15 minutes followed by a couple of clear hours before the cycle repeats - though a cyclone passing nearby can mean several consecutive rainy days confined largely to the hotel. Posters were clear that direct cyclone hits are rare even in peak season, and outcomes vary widely year to year - some visitors get lucky with little rain, others hit a genuinely wet stretch, with a quality resort and flexible plans the standard recommendation either way.
MauritiusNorthCoastRegular · January · 1 month ago · Read more on Tripadvisor ↗
Forum posters consistently describe October as statistically the driest month of the year across Mauritius, with great weather all around the island, temperatures typically touching 30C, and low humidity that posters specifically flag as a plus. Posters generally rate October as plenty warm enough for sunbathing and swimming, describing conditions as lovely with low rainfall. Posters note sunny weather is almost guaranteed, especially on the west coast, and that the wind should be less noticeable on the east side than earlier in the year. Posters do flag mosquitoes as a year-round presence regardless of season, recommending a DEET-based repellent. Posters generally rate October as one of the very best months to visit Grand Baie.
Tripadvisor community · October · 1 month ago · Read more on Tripadvisor ↗

Add your own note from Grand Baie's card on the map.

Grand Baie climate normals — September

Daytime high25°C / 77°F🌤 warm
Nighttime low21°C / 69°F
Feels like (high)25°C / 77°F
Sea temperature25°C / 76°F🙂 pleasant
Rainfall8 mm / 0.3 in☀️ dry
Rainy days3 days
Humidity71%💧 humid
Dew point17°C / 63°F
Sunshine11 h/day
Daylight12 h
Wind29 km/h / 18 mph
Air quality (US AQI)38🍃 good

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Crowds in Grand Baie in September

How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.

Busyschool holidays in 2 of the markets that fill it, one of its best months for weather(estimated)

JFMAMJJASOND

Peak crowdsBusyShoulder seasonQuiet

Best months for Grand Baie's weather

Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).

Fair weatherGrand Baie's weather doesn't swing hard through the year — comfort stays fairly steady in every month.

JFMAMJJASOND

What's on in Grand Baie in September

Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.

  • Season

    The south-east trades

    15 May – 31 Oct · usuallyWind season

    The trade winds blow through the winter and the island reorganises around them. Grand Baie sits on the sheltered north coast, which is why the dive boats and the island-hopping trips leave from here.

  • Nature

    Humpbacks off the west coast

    1 Jul – 31 Oct · usuallyWhale season

    Humpbacks pass along the west coast through the winter, and the boats that go out to them leave from Black River, an hour and a half down the coast rather than from Grand Baie itself.

What's on around the world in September →

Nearby, and something's on

Within 300 km of Grand Baie — a day trip or a short hop — with something on this month. Never part of the comfort score.

Where is Grand Baie?

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Grand Baie in September — FAQ

Is September a good time to visit Grand Baie?
September in Grand Baie: warm, dry, with clean air — one of the best months to visit. It ranks #1 of 12 months for Grand Baie on SeasonMap's comfort score (93/100).
What is the weather like in Grand Baie in September?
In September, Grand Baie averages a daily high of 25.2°C and a low of 20.8°C, with about 8.3 mm of rain over roughly 2.6 rainy days.
What is the air quality in Grand Baie in September?
Grand Baie has a mean US Air Quality Index of about 38 in September.

Within 300 km: Port Louis' Champ de Mars racing season around 1 Apr – 30 Nov.