SeasonMapGrand Baie weather in September
Mauritius
September in Grand Baie: warm, dry, with clean air — one of the best months to visit.
#1 of 12 months in Grand Baie · #78 of 1383 destinations to visit in September · comfort 93/100 (tier S)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Grand Baie in September
No notes yet. Open Grand Baie on the map to add the first one.
Grand Baie climate normals — September
| Daytime high | 25°C / 77°F | 🌤 warm |
|---|---|---|
| Nighttime low | 21°C / 69°F | |
| Feels like (high) | 25°C / 77°F | |
| Sea temperature | 25°C / 76°F | 🙂 pleasant |
| Rainfall | 8 mm / 0.3 in | ☀️ dry |
| Rainy days | 3 days | |
| Humidity | 71% | 💧 humid |
| Dew point | 17°C / 63°F | |
| Sunshine | 11 h/day | |
| Daylight | 12 h | |
| Wind | 29 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)
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.
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 seasonThe 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 seasonHumpbacks 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.
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?
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.
Other months in Grand Baie
Compare Grand Baie in September
Warmer or cooler than Grand Baie in September
Similar destinations in Indian Ocean — September
Within 300 km: Port Louis' Champ de Mars racing season around 1 Apr – 30 Nov.