SeasonMapBeau Vallon (Mahé) weather in September
Seychelles
September in Beau Vallon: hot, soaked, with clean air — fine if you can take 16 rainy days.
#8 of 12 months in Beau Vallon · #741 of 1383 destinations to visit in September · comfort 78/100 (tier B)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Beau Vallon in September
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Beau Vallon climate normals — September
| Daytime high | 29°C / 85°F | 🥵 hot |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Feels like (high) | 32°C / 90°F | |
| Sea temperature | 28°C / 82°F | 😎 warm sea |
| Rainfall | 162 mm / 6.4 in | ⛈ soaked |
| Rainy days | 16 days | |
| Humidity | 83% | 💦 very humid |
| Dew point | 23°C / 73°F | |
| Sunshine | 10.2 h/day | |
| Daylight | 12.1 h | |
| Wind | 30 km/h / 19 mph | |
| Air quality (US AQI) | 49 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Beau Vallon 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.
Shoulder seasonschool holidays in 2 of the markets that fill it, an ordinary month(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Beau Vallon'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 weatherBeau Vallon's best weather comes in July, August and October — separate windows, not one continuous season.
Best weatherFair weatherToughest weather
What's on in Beau Vallon in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Southeast trades
1 May – 30 SepWind seasonThe southeast monsoon is the drier, cooler and windier half of the year. Boats to the outer islands get cancelled more often and the water loses its clarity, but the humidity drops and walking the Morne trails stops being a chore. Source ↗
- Nature
Whale sharks off the bay
1 Aug – 31 Oct · usuallyDive seasonBook earlyThe monitoring programme runs from August to the end of October and the boats go out from the bay itself, spotter plane overhead. Numbers swing from year to year, so a blank day is a normal outcome rather than bad luck. Source ↗
Where is Beau Vallon?
Beau Vallon in September — FAQ
- Is September a good time to visit Beau Vallon?
- September in Beau Vallon: hot, soaked, with clean air — fine if you can take 16 rainy days. It ranks #8 of 12 months for Beau Vallon on SeasonMap's comfort score (78/100).
- What is the weather like in Beau Vallon in September?
- In September, Beau Vallon averages a daily high of 29.2°C and a low of 24.8°C, with about 162.3 mm of rain over roughly 16.1 rainy days.
- What is the air quality in Beau Vallon in September?
- Beau Vallon has a mean US Air Quality Index of about 49 in September.