Bora Bora · Month comparison
September vs May
May ranks #1 overall vs September at #3. Dry season begins — the lagoon turns its iconic turquoise, temperatures are pleasant, and the humpback whale season opens.
September
#3 of 12 months
Best match
Dry season tail — still outstanding conditions, European summer crowds thinning, and late humpback season.
- ↑September is the final month of the dry season and retains near-peak conditions: 8.5 hours of sunshine, 60mm of rain, and the trade winds present; the lagoon remains in full turquoise and the humpback whales are still present in declining numbers before their October departure southward
- ↑The post-August crowd reduction creates a noticeably quieter resort atmosphere from mid-September: the most photogenic resort areas (pool decks, overwater jetties) feel less occupied, and the guided lagoon tours are smaller groups; the September sweet spot between weather quality and crowd density is excellent
May
#1 of 12 months
Best match
Dry season begins — the lagoon turns its iconic turquoise, temperatures are pleasant, and the humpback whale season opens.
- ↑May marks the beginning of Bora Bora's dry season: rainfall drops to 90mm, the trade winds arrive from the southeast bringing clear skies and a comfortable breeze that takes the edge off the tropical heat, and the lagoon achieves the vivid turquoise colour that defines Bora Bora in the global imagination — the combination of the coral sand motu, the turquoise lagoon, and Mount Otemanu in clear sky is at its best from May onwards
- ↑Humpback whale season fully opens in May — whales arrive from their Antarctic feeding grounds and use French Polynesia's warm waters for breeding and calving; boat tours from the Bora Bora pier offer encounters (the whales approach the boats out of curiosity), and snorkelling alongside a 15-metre humpback is among the most singular wildlife experiences available in the Pacific
| Factor | September | May |
|---|---|---|
| Weather score | 9 | 8 |
| Value score | 5 | 7 |
| Crowd score | 5 | 6 |
| Events score | 6 | 6 |
| Atmosphere | 9 | 9 |
| Avg high temp | 27°C | 28°C |
| Monthly rain | 60mm | 90mm |
| Daily sunshine | 8.5hrs | 8.5hrs |
September trade-offs
- ↓Prices remain in the high-season bracket through September — the difference from August is marginal; October is where meaningful price reductions begin
- ↓Late-season humpback encounters are less reliable as the whale population prepares to depart southward; September visits should treat humpback encounters as a possible bonus rather than a core itinerary item
- ↓The transition to the wet season can begin in late September in some years — brief tropical showers reappear in the final 10 days of September, and the trade wind consistency reduces
May trade-offs
- ↓Some residual rainfall remains in May (90mm) — the dry season in Bora Bora is never bone-dry; brief tropical showers are still possible daily, though they typically last 30 minutes and are followed by sunshine
- ↓Crowds begin building in May as European visitors target the shoulder season and Tahiti-based tour packages ramp up; the best overwater bungalow categories fill up 3–4 months in advance for May stays
- ↓Temperatures drop slightly from the wet season highs — 28°C days with the trade wind chill create what is subjectively the most comfortable temperature range of the year, but those who equate tropical with very hot may find May slightly cool for extended lagoon swimming
Scores compare months within Bora Bora. Climate data: Open Meteo ERA5 30-year normals (1991–2020). Methodology →