Beau Vallon (Mahé) weather in September

September in Beau Vallon: hot, soaked, with clean air — fine if you can take 16 rainy days.

Updated September 2026 · climate normals from ERA5 reanalysis

Beau Vallon🇸🇨 Seychelles · Indian Ocean Islands · Beach78
  1. 69Jan
  2. 80Feb
  3. 84Mar
  4. 81Apr
  5. 74May
  6. 84Jun
  7. 86Jul
  8. 88Aug
  9. 78Sep
  10. 85Oct
  11. 78Nov
  12. 68Dec

#8 of 12 months in Beau Vallon · #754 of 1413 destinations to visit in September · comfort 78/100 (tier B)

Days
29°C
Nights
25°C
Wet days
16
Sun
10.2 h
Humidity
83%
Daylight
12 h
Beau Vallon, Seychelles
Photo: Matteo Parisi · Pexels

Traveller notes on Beau Vallon in September

Notes from nearby Victoria (3 km away)

Beau Vallon doesn't have its own notes for September yet — these are about Victoria, close enough to share the season.

Forum posters describe September as generally falling within the Seychelles' quieter, more settled season, though posters are consistent that no month here is fully predictable given the tropical setting - It is worth noting that Victoria's own 12-month climate record does not actually show September as a dry month - February and August run considerably drier (around 12-13 rainy days each versus September's roughly 19), with September's rainfall total among the higher months of the year rather than the lower. Posters flag rougher ocean conditions and stronger currents as a real September consideration at some beaches, improving into October once winds shift and settle from southeast to northwest, bringing calmer water and better snorkeling visibility. Posters generally rate September as a workable but genuinely wetter choice for Victoria than the forum's "dry season" label suggests, with October the better-supported pick for calmer water and lower rain.
Tripadvisor community · September · 1 month ago · about Victoria · Read more on Tripadvisor ↗

Other months in Beau Vallon

Seychelles forum threads are consistent that January is the rainiest month of the year, and Beau Vallon specifically - on the northern side of Mahé - tends to see more rain and cloud than the island's southern coast, thanks to the northwest trade winds pushing cloud masses in this time of year. Despite that, posters were clear this isn't monsoon-style all-day rain: a typical day mixes real sunshine with rain showers, and most visitors get at least a few solid beach hours daily even in the wettest stretch. The general advice: expect a genuine mix of sun, cloud and rain rather than betting on either extreme.
MaheIslandNorthRegular · January · 1 month ago · Read more on Tripadvisor ↗
Forum posters describe mid-March visits as mainly sunny and hot with the occasional full rain day mixed in - Seychelles weather is repeatedly called genuinely unpredictable, with posters noting the islands have real micro-climates that can make conditions differ from one side of Mahe to the other, so no forecast covers every variation. The specific seasonal issue for Beau Vallon in March is dead seaweed washing up on the beach, a recurring nuisance posters say clears up by late April into May, when the ocean also turns calmer with better visibility as temperatures and humidity start to ease. For travelers prioritizing clean sand and clear water over slightly warmer conditions, posters suggest that later window is the better trade-off.
Tripadvisor community · March · 1 month ago · Read more on Tripadvisor ↗

Add your own note from Beau Vallon's card on the map.

Beau Vallon climate normals — September

Daytime high29°C / 85°F🥵 hot
Nighttime low25°C / 77°F
Feels like (high)32°C / 90°F
Sea temperature28°C / 82°F😎 warm sea
Rainfall162 mm / 6.4 in⛈ soaked
Rainy days16 days
Humidity83%💦 very humid
Dew point23°C / 73°F
Sunshine10.2 h/day
Daylight12.1 h
Wind30 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)

JFMAMJJASOND

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.

JFMAMJJASOND

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 season

    The 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 early

    The 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 ↗

What's on around the world in September →

Where is Beau Vallon?

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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.